EP1349235A1 - VHF-UHF dual band antenna system - Google Patents

VHF-UHF dual band antenna system Download PDF

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Publication number
EP1349235A1
EP1349235A1 EP03100746A EP03100746A EP1349235A1 EP 1349235 A1 EP1349235 A1 EP 1349235A1 EP 03100746 A EP03100746 A EP 03100746A EP 03100746 A EP03100746 A EP 03100746A EP 1349235 A1 EP1349235 A1 EP 1349235A1
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EP
European Patent Office
Prior art keywords
antenna
line
uhf
frequency band
duplexer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03100746A
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German (de)
French (fr)
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EP1349235B1 (en
Inventor
Fréderic Thales Ngo Bui Hung
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Thales SA
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Thales SA
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Filing date
Publication date
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Priority to SI200330820T priority Critical patent/SI1349235T1/en
Publication of EP1349235A1 publication Critical patent/EP1349235A1/en
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Publication of EP1349235B1 publication Critical patent/EP1349235B1/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/18—Vertical disposition of the antenna

Definitions

  • VHF Very High Frequencies
  • Figure 1 is an example of antenna A installed on a V.
  • the antenna is essentially composed of an element radiating upper 1 and a lower radiating element 2, which are both powered by a feeding device.
  • fixing base 5 usually provided with a spring 6 to protect the antenna accidental impacts against obstacles, allows the installation of it on the vehicle.
  • the lower radiating element 2 is normally equipped to its lower end of a current blocker 3, usually designated in Anglo-Saxon language by the expression "RF cable choke".
  • Modern transceivers operating through example in the frequency band 30 to 88 MHz have on time of a service road that uses other frequencies, in particular the frequencies of the UHF band (Ultra High Frequencies) from 2.4 to 2.5 GHz.
  • Radiant elements 1 and 2 of the antenna broadband which have a length dimensioned for the VHF band from 30 to 88 MHz, typically a length of the order of 1.6 meters, are not not suitable for proper operation at UHF frequencies from 2.4 to 2.5 GHz. These last require radiating elements of dimension about thirty times smaller.
  • the solution currently adopted is to provide an antenna additional A 'dedicated to this UHF channel as it is represented at the Figure 2a.
  • An example of an installation synoptic of this solution is shown in Figure 2b where is schematized a transceiver station 7 feeding a VHF antenna, A and a UHF antenna, A 'through a duplexer 8 whose role is to separate VHF frequencies and frequencies UHF and direct them to their respective antennas.
  • Fbb, Fbh low frequency frequency
  • Fhb, Fhh high frequency frequency band
  • the feeding device is for example connected to a station transceiver by means of a transmission line and the element radiating lower is for example constituted of a section of the line of transmission and the antenna assembly has at least one element radiating hollow arranged around the stretch.
  • the system may have several hollow elements connected between them and in series by means of line portions, the soul of a connecting portion the upper end of the hollow element indexed i at the lower end of the element indexed i + 1 and the shielding of the portion of line indexed i is connected to the coaxial line, for example the shielding of the line.
  • a duplexer is for example arranged at the level of the part lower part of the antenna assembly and is connected to at least one hollow element and to the line section.
  • the system is for example used for radio signals frequencies.
  • Figure 3 shows the block diagram of a next antenna the invention intended to function in particular in the two bands of VHF frequencies from 30 to 88 MHz and UHF from 2.4 to 2.5 GHz.
  • the antenna is in this example installed on a vehicle.
  • the distance between the feed device 4 and the blocker current 3 is for example of the order of 1.6 meters.
  • Mass M of vehicle is taken in this embodiment as a common mass to the whole system.
  • the coaxial transmission line 9 is for example composed of several sections. These sections are connected together using, for example, known and not shown devices, such as coaxial connectors male and female, etc.
  • the fixing base 5 and its spring 6, the means mechanical devices that make the antenna of the latter or the elements annexes (such as radome, connectors, etc.) that provide rigidity and the assembly of the constituents will not be detailed because they are not necessary to understand the invention.
  • the current blocker 3 (adapted to the VHF) whose function is to delimit radioelectrically the section 9 1 of the coaxial transmission line 9, is carried out for example according to the techniques known to those skilled in the art.
  • the implementation of a skirt around the coaxial transmission line or the winding of this line around a ferrite core, etc. will not be detailed for the sake of clarity.
  • the upper radiating element 1 and the lower radiating element 2 constitute, for example, the two strands of a dipole sized for radiate in the VHF frequency band, for example throughout the band 30 to 88 MHz. They are powered through the feeder 4 which realizes impedance matching to allow maximum transfer of RF power (radio frequency) brought by the transmission line coaxial 9. This is true throughout the 30-88 MHz frequency band.
  • An exemplary embodiment of the feed device 4 is shown schematically in FIG. figure 5.
  • FIG. 4 is a sectional view of an exemplary embodiment of the antenna assembly 10, where the line section 9 1 is interrupted to have for example a duplexer 8, thus leading to a lower part of the section and an upper part. of the section.
  • the ends of the interrupted section are referenced 9 11 and 9 12 .
  • the upper end 9 11 of the lower part of the section 9 1 is provided with a current blocker 11 sized for the UHF frequencies.
  • This current blocker has the particular function of isolating the signals of the UHF band while remaining transparent to the signals of the VHF band.
  • the technique for producing this current blocker is, for example, a quarter-wave skirt known to those skilled in the art.
  • a skirt body 11 1 of tubular shape surrounds the section 9 1 of the coaxial line, the lower edge 11 2 of this skirt body is short-circuited by a cover 11 4 to the shield 9 B of the coaxial line while the edge upper 11 3 is left open to provide the current blocking function.
  • duplexer-adapter 8 Between the lower part of the section and the upper part is arranged a duplexer-adapter 8.
  • the connection of the duplexer-adapter 8 to the ends 9 11 and 9 12 is effected for example by connecting the shielding of these ends to the common ground 12 of the duplexer-adapter 8 and by connecting the cores of the ends 9 11 and 9 12 of this line coaxial respectively to the input terminal 8 1 and the output terminal 8 2 of the VHF channel of the duplexer-adapter 8.
  • This duplexer- The adapter comprises a low-pass filter 13 which behaves as a direct connection between the input terminals 8 1 and 82 for the VHF signals and an open circuit for the UHF signals.
  • the high-pass filter 14 of the duplexer-adapter behaves as a direct connection between the input terminal 8 1 and the output terminal 8 3 of the UHF channel for the UHF signals which are thus taken from the input terminal 8 1 to be brought up to the output terminal 8 3 .
  • the length L of these elements is for example of the order of the average half-wavelength corresponding to the UHF band.
  • the elements have, for example, substantially identical lengths. Insulating parts used to maintain the coaxial line in the cylindrical tubes or to ensure the assembly and rigidity of the assembly are not detailed because they are known to those skilled in the art.
  • the radiating elements 15i are connected to each other by means of portions 16i of coaxial line, for example they are coupled in series. The length of a portion 16i is substantially equal to the half-average wavelength corresponding to the UHF band.
  • the core 17i of a portion 16i connects the upper end 15 i2 of the element 15 i to the lower end 15 (i + 1) 1 of the element 15 (i + 1) .
  • the web 17 1 1 line 16 connects the upper portion 15, 12 of the lower member end 15 1 to the lower end 15, 21 of the element 15 2 and the web 17 2 of the portion line 16 2 connects the upper end 22 of the element 2 to the lower end 31 of the element 3 .
  • the shields 18 1 and 18 2 of the line portions 16 1 and 16 2 are electrically connected, for example, to the shield of the coaxial line 9 1 .
  • the radiating assembly consisting for example of cylindrical tubes 15 1 , 15 2 and 15 3 and connecting portions 16 1 and 162 is supplied with RF power of the UHF band by connecting the lower end 11 of the cylindrical hollow element 15 1 closest to the duplexer-adapter to the output terminal 8 3 of the duplexer-adapter.
  • a cover 19 is placed for example towards the middle of the upper tube 3 to short circuit the latter to the shielding of the coaxial line.
  • a quarter-wave skirt 20 of the type in the lower part is thus formed to act as a current blocker for the UHF signals.
  • the number of cylindrical tubes is chosen in particular depending on the directivity desired for the UHF antenna. Without leaving the frame of the invention, the structure of the antenna described also applies for antennas operating in other frequency bands, while respecting the condition that these frequency bands are not adjacent. Any hollow element whatever its shape can be used as a radiating element.
  • FIG. 5 depicts an example of a feed device 4. This last has an impedance transformer 21 whose output 22 of its secondary winding 23 is connected to the upper radiating element 1.
  • the primary winding 24 of this step-up transformer is connected to the connection point 25 to the core of the transmission line 9 to through a parallel LC circuit 26 consisting of an inductor 27 and a capacitor 28, followed by a series LC circuit 29 consisting of an inductor 30 and 31.
  • the mass of this matching circuit is connected to the shield from the coaxial transmission line 9 to the connection point 32.
  • the value of the transformer transformation ratio 21 and the values of the inductances 27, 30 and capacitors 28, 31 are determined so that the impedance presented between connection points 25 and 32 is the most possible close to the usual characteristic impedance of 50 ohms for all frequencies in the band 30 to 88 MHz.
  • FIG. 6 details an embodiment of the duplexer-adapter.
  • the low-pass filter 13 is provided by a portion 33 of coaxial line of which a first end 34 is short-circuited (that is to say that the core and the shield of the coaxial line are connected together) and constitutes the terminal 8 2 and whose opposite end 35 has its soul connected to the terminal 8 1 and its shielding left free.
  • the high-pass filter 14 is provided by a portion 36 of coaxial line whose shield 37 from its upper end constitutes the terminal 8 3 and whose core 38 of the other end is connected to the terminal 8 1 .
  • the lengths of the portions 33 and 36 are of the order of magnitude of the quarter of the average wavelength corresponding to the UHF band and are adjusted to allow the impedance matching of the antenna assembly 10 according to the invention to UHF frequencies used.
  • FIG. 7 represents another variant embodiment of the invention.
  • the antenna according to the invention has here two separate accesses allowing the connection of two transceiver stations 7 1 and 7 2 operating one in the VHF band of 30 to 88 MHz and the other in the UHF band of 2, 4 to 2.5 GHz.
  • the station 7 1 of the VHF band is for example connected to the supply device 4 by the coaxial transmission line 9 which passes through the current blocker 3 and an antenna assembly 10 '.
  • the station 7 2 of the UHF band is for example connected to the radiating elements 15i of the antenna assembly 10 'by the section 9' 1 of the coaxial secondary transmission line 9 'which passes through the current blocker 3.
  • This antennal assembly 10 ' does not include a duplexer-adapter unlike the antenna set given in the previous example.
  • the section 9 1 of coaxial line remains uninterrupted between the current blocker 3 and the supply device 4.
  • the supply of the tubular radiating elements 15i is made by connecting the lower end 15 11 of the element 15 1 nearest of the section of line 9 ' 1 , to the core 9' A of this section 9 ' 1 whose shielding 9' B is integral with that of the section 9 1 of the coaxial line 9.
  • the shields of the sections of lines 9 1 and 9 ' 1 behave radioelectrically as a single shield when passing through the current blockers 3 and 11.
  • the other end of the secondary coaxial line is connected to the station 7 2 transceiver of the UHF band.
  • FIGS. 9 and 10 schematize an alternative embodiment described in FIGS. 7 and 8 where the two emitters 7 1 and 7 2 are replaced by a single emitter 7 which directly supplies the transmission line 9.
  • This line is interrupted so as to position a duplexer 8 in a manner similar to that described in Figure 4.
  • This duplexer feeds the two line sections 9 1 and 9 ' 1 which were detailed in Figures 7 and 8.
  • FIG. 10 shows in detail the connection between the duplexer 8 and the line sections 9 1 and 9 ' 1 .
  • the connection of the duplexer-adapter 8 to the ends 9 11 and 9 12 of the interrupted line section 9 1 is carried out for example by connecting the shielding of these ends to the common ground 12 of the duplexer-adapter 8 and connecting the ends of the cores 9 11 and 9 12 of this line coaxial respectively to the input terminal 8 1 and the output terminal 8 2 of the VHF channel of the duplexer-adapter 8.
  • the secondary line 9 ' 1 the latter is in connection with the exit 8 3 of the UHF channel.
  • This duplexer-adapter comprises a low-pass filter 13 which behaves as a direct connection between the input terminals 8 1 and 8 2 for the VHF signals and an open circuit for the UHF signals.
  • the high-pass filter 14 of the duplexer adapter behaves as a direct connection between the input terminal 8 1 and the output terminal 8 3 of the UHF channel for the UHF signals which are thus taken from the input terminal 8 1 to be brought to the terminal output 8 3 to supply the line section 9 ' 1 .
  • the current blocker 11 sized for the UHF frequencies is located on the two transmission lines 9 1 and 9 ' 1 and above the duplexer. It has characteristics identical or substantially identical to those given in Figure 4 and in fact will not be detailed.

Abstract

The wide band antenna system receives signals in a low frequency band covering an octave and over a high frequency band. There is a feed (4) feeding an upper radiator (1) and a lower radiating element (2). An antenna assembly (10) radiates in the upper frequency band.

Description

La présente invention concerne notamment un système antennaire capable de fonctionner dans plusieurs gammes de fréquences distinctes, par exemple, une première bande de fréquence, basse fréquence [Fbb, Fbh], couvrant au moins une octave et une deuxième bande de fréquence, haute fréquence [Fhb, Fhh], les deux bandes étant séparées d'un écart tel que Fhb>=2FbhThe present invention relates in particular to a system antenna capable of operating in several frequency ranges for example, a first frequency band, low frequency [Fbb, Fbh], covering at least one octave and a second band of frequency, high frequency [Fhb, Fhh], the two bands being separated by one gap such that Fhb> = 2Fbh

Les antennes large-bande susceptibles de fonctionner avec les équipements radio dans la bande VHF (Very High Frequencies) couvrant les fréquences de 30 à 88 MHz sont connues de l'art antérieur.Broadband antennas likely to work with radio equipment in the Very High Frequencies (VHF) band covering frequencies of 30 to 88 MHz are known from the prior art.

Par exemple, les brevets US 4,496,953 et US 4,302,760 décrivent de telles antennes. La figure 1 est un exemple d'antenne A installée sur un véhicule terrestre V. L'antenne est composée essentiellement d'un élément rayonnant supérieur 1 et d'un élément rayonnant inférieur 2, qui sont alimentés tous les deux au moyen d'un dispositif d'alimentation 4. Une embase de fixation 5, munie usuellement d'un ressort 6 pour protéger l'antenne des impacts accidentels contre des obstacles, permet l'installation de celle-ci sur le véhicule. Afin d'isoler radioélectriquement l'antenne de la masse du véhicule, l'élément rayonnant inférieur 2 est normalement équipé à son extrémité inférieure d'un bloqueur de courant 3, habituellement désigné en langage anglo-saxon par l'expression « RF câble choke ».For example, US Patents 4,496,953 and US 4,302,760 describe such antennas. Figure 1 is an example of antenna A installed on a V. The antenna is essentially composed of an element radiating upper 1 and a lower radiating element 2, which are both powered by a feeding device. fixing base 5, usually provided with a spring 6 to protect the antenna accidental impacts against obstacles, allows the installation of it on the vehicle. In order to radio isolate the antenna of the mass of the vehicle, the lower radiating element 2 is normally equipped to its lower end of a current blocker 3, usually designated in Anglo-Saxon language by the expression "RF cable choke".

Les postes émetteurs-récepteurs modernes fonctionnant par exemple dans la bande de fréquence 30 à 88 MHz, disposent à l'heure actuelle d'une voie de service qui met en oeuvre d'autres bandes de fréquences, en particulier les fréquences de la bande UHF (Ultra High Frequencies) de 2,4 à 2,5 GHz. Les éléments rayonnants 1 et 2 de l'antenne large bande précitée, qui ont une longueur dimensionnée pour la bande VHF de 30 à 88 MHz, typiquement une longueur de l'ordre de 1,6 mètres, ne sont pas appropriés pour fonctionner correctement aux fréquences UHF de 2,4 à 2,5 GHz. Ces dernières nécessitent en effet des éléments rayonnants de dimension environ trente fois plus petite.Modern transceivers operating through example in the frequency band 30 to 88 MHz, have on time of a service road that uses other frequencies, in particular the frequencies of the UHF band (Ultra High Frequencies) from 2.4 to 2.5 GHz. Radiant elements 1 and 2 of the antenna broadband, which have a length dimensioned for the VHF band from 30 to 88 MHz, typically a length of the order of 1.6 meters, are not not suitable for proper operation at UHF frequencies from 2.4 to 2.5 GHz. These last require radiating elements of dimension about thirty times smaller.

Pour ces postes émetteurs-récepteurs VHF disposant d'une voie de service UHF, la solution couramment adoptée est de prévoir une antenne supplémentaire A' dédiée à cette voie UHF comme il est représenté à la figure 2a. Un exemple de synoptique d'installation de cette solution est reporté à la figure 2b où est schématisé un poste émetteur-récepteur 7 alimentant une antenne VHF, A et une antenne UHF, A' à travers un duplexeur 8 dont le rôle est de séparer les fréquences VHF et les fréquences UHF et de les aiguiller vers leurs antennes respectives.For these VHF transceivers with one channel UHF service, the solution currently adopted is to provide an antenna additional A 'dedicated to this UHF channel as it is represented at the Figure 2a. An example of an installation synoptic of this solution is shown in Figure 2b where is schematized a transceiver station 7 feeding a VHF antenna, A and a UHF antenna, A 'through a duplexer 8 whose role is to separate VHF frequencies and frequencies UHF and direct them to their respective antennas.

Cette solution engendre cependant des exigences d'installation très contraignantes :

  • Figure 00020001
    Disposer d'un emplacement libre sur le véhicule pour la fixation de l'antenne supplémentaire UHF,
  • Figure 00020002
    La nécessité de dégager parfois en hauteur cette antenne supplémentaire UHF qui est de petite taille, afin qu'elle ne soit pas masquée par d'autres équipements du même véhicule,
  • Figure 00020003
    La nécessité d'un duplexeur externe pour séparer la voie principale VHF de la voie de service UHF dans le cas où le poste émetteur-récepteur ne comporterait qu'un seul connecteur de sortie pour les deux voies.
    • This solution, however, generates very demanding installation requirements:
  • Figure 00020001
    Have a free space on the vehicle for attaching the additional UHF antenna,
  • Figure 00020002
    The need to clear sometimes this UHF additional antenna which is small, so that it is not hidden by other equipment of the same vehicle,
  • Figure 00020003
    The need for an external duplexer to separate the VHF main channel from the UHF service channel in the case where the transceiver station has only one output connector for both channels.

    • L'objet de la présente invention concerne un système antennaire permettant de disposer d'une antenne unique large bande, couvrant simultanément au moins deux bandes de fréquences distinctes, une bande de fréquence basse fréquence [Fbb, Fbh] couvrant au moins une octave et une bande de fréquence haute fréquence [Fhb, Fhh], les deux bandes étant séparées d'un écart tel que Fhb>=2Fbh. Par exemple, il est possible de travailler dans la bande VHF de 30 à 88 MHz et la bande UHF de 2,4 à 2,5 GHz.The subject of the present invention relates to an antennal system allowing for a single broadband antenna, covering simultaneously two or more separate frequency bands, a band of low frequency frequency [Fbb, Fbh] covering at least one octave and a high frequency frequency band [Fhb, Fhh], the two bands being separated by a gap such that Fhb> = 2Fbh. For example, it is possible to working in the 30 to 88 MHz VHF band and the 2.4 to 2.5 UHF band GHz.

    L'invention concerne un système antennaire large bande, susceptible de rayonner ou de recevoir des signaux dans une bande de fréquence basse fréquence [Fbb, Fbh] couvrant plus d'une octave et une bande de fréquence haute fréquence [Fhb, Fhh], avec Fbh>=2Fhb, comportant au moins un dispositif d'alimentation alimentant au moins un élément rayonnant supérieur et un élément rayonnant inférieur. Il est caractérisé en ce que l'élément rayonnant inférieur est pourvu d'au moins un ensemble antennaire adapté à rayonner dans la bande de fréquence haute fréquence [Fhb,Fhh].The invention relates to a broadband antenna system, likely to radiate or receive signals in a band of low frequency frequency [Fbb, Fbh] covering more than one octave and one high frequency frequency band [Fhb, Fhh], with Fbh> = 2Fhb, having at least one feeder feeding at least one upper radiating element and a lower radiating element. It is characterized in that the lower radiating element is provided with at least one antennal set adapted to radiate in the high frequency band frequency [Fhb, Fhh].

    Le dispositif d'alimentation est par exemple relié à un poste émetteur-récepteur au moyen d'une ligne de transmission et l'élément rayonnant inférieur est par exemple constitué d'un tronçon de la ligne de transmission et l'ensemble antennaire comporte au moins un élément rayonnant creux disposé autour du tronçon.The feeding device is for example connected to a station transceiver by means of a transmission line and the element radiating lower is for example constituted of a section of the line of transmission and the antenna assembly has at least one element radiating hollow arranged around the stretch.

    Le système peut comporter plusieurs éléments creux reliés entre eux et en série aux moyens de portions de ligne, l'âme d'une portion reliant l'extrémité supérieure de l'élément creux indicé i à l'extrémité inférieure de l'élément indicé i+1 et le blindage de la portion de ligne indicée i est relié à la ligne coaxiale, par exemple au blindage de la ligne.The system may have several hollow elements connected between them and in series by means of line portions, the soul of a connecting portion the upper end of the hollow element indexed i at the lower end of the element indexed i + 1 and the shielding of the portion of line indexed i is connected to the coaxial line, for example the shielding of the line.

    Un duplexeur est par exemple disposé au niveau de la partie inférieure de l'ensemble antennaire et est relié à au moins un élément creux et au tronçon de ligne.A duplexer is for example arranged at the level of the part lower part of the antenna assembly and is connected to at least one hollow element and to the line section.

    Le système est par exemple utilisé pour des signaux radio fréquences.The system is for example used for radio signals frequencies.

    L'objet de l'invention présente notamment les avantages suivants :

  • Figure 00030001
    Eviter l'installation d'une deuxième antenne pour la voie UHF et tous les inconvénients qui en découlent, par exemple l'encombrement,
  • Figure 00030002
    En suivant certains agencements, l'ensemble antennaire qui contribue au rayonnement de la bande UHF est déporté en hauteur, optimisant ainsi la qualité de la liaison radio dans cette bande, ce qui n'est pas le cas pour les installations usuelles avec une deuxième antenne montée directement sur le toit du véhicule porteur,
  • Figure 00040001
    La possibilité de réaliser l'antenne de la bande UHF avec une directivité supérieure à celle d'une antenne dipôle demi-onde ce qui permet d'accroítre la portée de la liaison radio dans cette bande.
    • The subject of the invention has the following advantages:
  • Figure 00030001
    Avoid the installation of a second antenna for the UHF channel and all the inconveniences resulting from it, for example congestion,
  • Figure 00030002
    By following certain arrangements, the antenna assembly that contributes to the radiation of the UHF band is offset in height, thus optimizing the quality of the radio link in this band, which is not the case for the usual installations with a second antenna. mounted directly on the roof of the carrier vehicle,
  • Figure 00040001
    The possibility of making the antenna of the UHF band with a directivity greater than that of a half-wave dipole antenna which allows to increase the range of the radio link in this band.

    • D'autres caractéristiques et avantages de l'objet de l'invention apparaítront mieux à la lecture de la description annexée des figures qui représentent :

  • Figure 00040002
    La figure 1 un exemple d'antenne selon l'art antérieur,
  • Figure 00040003
    Les figures 2a et 2b, un poste émetteur-récepteur comportant une antenne pour la voie VHF et une antenne pour la voie UHF et son synoptique,
  • Figure 00040004
    La figure 3 un schéma synoptique de l'antenne selon l'invention,
  • Figure 00040005
    La figure 4 une vue en coupe d'une réalisation de l'ensemble antennaire selon l'invention,
  • Figure 00040006
    La figure 5 un exemple de dispositif d'alimentation,
  • Figure 00040007
    La figure 6 un exemple de réalisation d'un duplexeur,
  • Figure 00040008
    Les figures 7 et 8 une variante de réalisation du système de la figure 3,
  • Figure 00040009
    Les figures 9 et 10 une variante de réalisation des figures 7 et 8.
    • Other features and advantages of the subject of the invention will appear better on reading the appended description of the figures which represent:
  • Figure 00040002
    FIG. 1 an example of an antenna according to the prior art,
  • Figure 00040003
    FIGS. 2a and 2b, a transceiver station comprising an antenna for the VHF channel and an antenna for the UHF channel and its synoptic,
  • Figure 00040004
    FIG. 3 is a block diagram of the antenna according to the invention,
  • Figure 00040005
    FIG. 4 is a sectional view of an embodiment of the antenna assembly according to the invention,
  • Figure 00040006
    FIG. 5 is an example of a feeding device,
  • Figure 00040007
    FIG. 6 an embodiment of a duplexer,
  • Figure 00040008
    FIGS. 7 and 8 show an alternative embodiment of the system of FIG. 3,
  • Figure 00040009
    Figures 9 and 10 an alternative embodiment of Figures 7 and 8.

    • Sur les différentes figures, les éléments correspondants sont désignés par les mêmes références.In the different figures, the corresponding elements are designated by the same references.

    La figure 3 présente le schéma synoptique d'une antenne suivant l'invention, destinée à fonctionner en particulier dans les deux bandes de fréquences VHF de 30 à 88 MHz et UHF de 2,4 à 2,5 GHz. L'antenne est dans cet exemple installée sur un véhicule.Figure 3 shows the block diagram of a next antenna the invention intended to function in particular in the two bands of VHF frequencies from 30 to 88 MHz and UHF from 2.4 to 2.5 GHz. The antenna is in this example installed on a vehicle.

    L'antenne A est composée par exemple d'un dispositif d'alimentation 4 connecté à un poste émetteur-récepteur 7 à travers une ligne de transmission 9 sensiblement coaxiale ou coaxiale. La valeur de l'impédance caractéristique de cette ligne est égale à la valeur usuellement adoptée pour les systèmes de radiocommunication, soit 50 ohms. L'antenne comprend par exemple :

  • Figure 00050001
    un élément rayonnant supérieur 1, réalisé par exemple selon des principes connus de l'Homme du métier, par exemple un brin conducteur d'environ 1,6 mètres,
  • Figure 00050002
    un élément rayonnant inférieur 2 composé par un tronçon 91 de la ligne de transmission coaxiale 9 et comportant par exemple un bloqueur de courant 3 et un ensemble antennaire 10 destiné à la bande UHF disposés au niveau du tronçon. Le tronçon 91 est par exemple délimité par le dispositif d'alimentation 4 et le bloqueur de courant 3. L'ensemble antennaire 10 est disposé entre un repère inférieur 101 et un repère supérieur 102. Cet ensemble antennaire assure notamment le bon rayonnement dans la bande UHF de 2,4 à 2,5 GHz. Les repères 101, 102 sont par exemple choisis le plus près possible du dispositif d'alimentation 4 pour que l'ensemble antennaire puisse être déporté en hauteur. Ceci permet une meilleure émission-réception.
    • The antenna A is composed, for example, of a power supply device 4 connected to a transceiver station 7 through a substantially coaxial or coaxial transmission line 9. The value of the characteristic impedance of this line is equal to the value usually adopted for radiocommunication systems, ie 50 ohms. The antenna includes for example:
  • Figure 00050001
    an upper radiating element 1, produced for example according to principles known to those skilled in the art, for example a conductive strand of about 1.6 meters,
  • Figure 00050002
    a lower radiating element 2 composed by a section 9 1 of the coaxial transmission line 9 and comprising, for example, a current blocker 3 and an antenna assembly 10 intended for the UHF band arranged at the section. The section 9 1 is for example defined by the supply device 4 and the current blocker 3. The antenna assembly 10 is disposed between a lower mark 10 1 and an upper mark 10 2 . This antenna assembly ensures in particular the good radiation in the UHF band of 2.4 to 2.5 GHz. The marks 10 1 , 10 2 are for example chosen as close as possible to the feed device 4 so that the antenna assembly can be offset in height. This allows a better transmission-reception.

    • La distance qui sépare le dispositif d'alimentation 4 et le bloqueur de courant 3 est par exemple de l'ordre de 1,6 mètres. La masse M du véhicule est prise dans cet exemple de réalisation comme masse commune à l'ensemble du système.The distance between the feed device 4 and the blocker current 3 is for example of the order of 1.6 meters. Mass M of vehicle is taken in this embodiment as a common mass to the whole system.

    Afin de permettre la réalisation d'une antenne susceptible d'être démontée en plusieurs morceaux de faible longueur pour le transport, la ligne de transmission coaxiale 9 est par exemple constituée de plusieurs sections. Ces sections sont reliées ensemble en utilisant par exemple des dispositifs connus et non représentés, tels que des connecteurs coaxiaux mâle et femelle, etc. L'embase de fixation 5 et son ressort 6, les moyens mécaniques qui rendent solidaires l'antenne de ces derniers ou les éléments annexes (tels que radôme, connecteurs, etc.) qui assurent la rigidité et l'assemblage des constituants ne seront pas détaillés car ils ne sont pas nécessaires à la compréhension de l'invention.In order to allow the realization of an antenna likely to be disassembled into several pieces of short length for transport, the coaxial transmission line 9 is for example composed of several sections. These sections are connected together using, for example, known and not shown devices, such as coaxial connectors male and female, etc. The fixing base 5 and its spring 6, the means mechanical devices that make the antenna of the latter or the elements annexes (such as radome, connectors, etc.) that provide rigidity and the assembly of the constituents will not be detailed because they are not necessary to understand the invention.

    Le bloqueur de courant 3 (adapté à la VHF) ayant pour rôle de délimiter radioélectriquement le tronçon 91 de la ligne de transmission coaxiale 9, est réalisé par exemple suivant les techniques connues de l'Homme du métier. Par exemple la mise en oeuvre d'une jupe autour de la ligne de transmission coaxiale ou le bobinage de cette ligne autour d'un tore de ferrite etc. ne seront pas détaillés pour des soucis de clarté.The current blocker 3 (adapted to the VHF) whose function is to delimit radioelectrically the section 9 1 of the coaxial transmission line 9, is carried out for example according to the techniques known to those skilled in the art. For example, the implementation of a skirt around the coaxial transmission line or the winding of this line around a ferrite core, etc. will not be detailed for the sake of clarity.

    L'élément rayonnant supérieur 1 et l'élément rayonnant inférieur 2 constituent par exemple les deux brins d'un dipôle dimensionné pour rayonner dans la bande de fréquences VHF, par exemple dans toute la bande de 30 à 88 MHz. Ils sont alimentés à travers le dispositif d'alimentation 4 qui réalise l'adaptation d'impédance pour permettre le transfert maximum de puissance RF (radio fréquence) amenée par la ligne de transmission coaxiale 9. Ceci est vrai dans toute la bande de fréquences de 30 à 88 MHz. Un exemple de réalisation du dispositif d'alimentation 4 est schématisé à la figure 5.The upper radiating element 1 and the lower radiating element 2 constitute, for example, the two strands of a dipole sized for radiate in the VHF frequency band, for example throughout the band 30 to 88 MHz. They are powered through the feeder 4 which realizes impedance matching to allow maximum transfer of RF power (radio frequency) brought by the transmission line coaxial 9. This is true throughout the 30-88 MHz frequency band. An exemplary embodiment of the feed device 4 is shown schematically in FIG. figure 5.

    La figure 4 est une vue en coupe d'un exemple de réalisation de l'ensemble antennaire 10, où le tronçon de ligne 91 est interrompu pour disposer par exemple un duplexeur 8, conduisant ainsi à une partie inférieure du tronçon et une partie supérieure du tronçon. Les extrémités du tronçon interrompu sont référencées 911 et 912.FIG. 4 is a sectional view of an exemplary embodiment of the antenna assembly 10, where the line section 9 1 is interrupted to have for example a duplexer 8, thus leading to a lower part of the section and an upper part. of the section. The ends of the interrupted section are referenced 9 11 and 9 12 .

    L'extrémité supérieure 911 de la partie inférieure du tronçon 91, est pourvue d'un bloqueur de courant 11 dimensionné pour les fréquences UHF. Ce bloqueur de courant a notamment pour fonction d'isoler les signaux de la bande UHF tout en restant transparent aux signaux de la bande VHF. La technique pour réaliser ce bloqueur de courant est par exemple une jupe quart-d'onde connue de l'Homme du métier. Un corps de jupe 111 de forme tubulaire entoure le tronçon 91 de la ligne coaxiale, le bord inférieur 112 de ce corps de jupe est court-circuité par un couvercle 114 au blindage 9B de la ligne coaxiale alors que le bord supérieur 113 est laissé ouvert pour assurer la fonction de bloqueur de courant.The upper end 9 11 of the lower part of the section 9 1 , is provided with a current blocker 11 sized for the UHF frequencies. This current blocker has the particular function of isolating the signals of the UHF band while remaining transparent to the signals of the VHF band. The technique for producing this current blocker is, for example, a quarter-wave skirt known to those skilled in the art. A skirt body 11 1 of tubular shape surrounds the section 9 1 of the coaxial line, the lower edge 11 2 of this skirt body is short-circuited by a cover 11 4 to the shield 9 B of the coaxial line while the edge upper 11 3 is left open to provide the current blocking function.

    Entre la partie inférieure du tronçon et la partie supérieure est disposée un duplexeur-adaptateur 8. La connexion du duplexeur-adaptateur 8 aux extrémités 911 et 912 s'effectue par exemple en reliant le blindage de ces extrémités à la masse commune 12 du duplexeur-adaptateur 8 et en branchant les âmes des extrémités 911 et 912 de cette ligne coaxiale respectivement à la borne d'entrée 81 et à la borne de sortie 82 de la voie VHF du duplexeur-adaptateur 8. Ce duplexeur-adaptateur comporte un filtre passe-bas 13 qui se comporte comme une connexion directe entre les bornes d'entrée 81 et 82 pour les signaux VHF et un circuit ouvert pour les signaux UHF. Pour les signaux VHF, tout se passe comme si la coupure effectuée dans le tronçon de ligne 91 n'existait pas et les signaux VHF peuvent donc être amenés jusqu'au dispositif d'alimentation 4. Par contre le filtre passe-haut 14 du duplexeur-adaptateur se comporte comme une connexion directe entre la borne d'entrée 81 et la borne de sortie 83 de la voie UHF pour les signaux UHF qui sont donc prélevés depuis la borne d'entrée 81 pour être amenés jusqu'à la borne de sortie 83.Between the lower part of the section and the upper part is arranged a duplexer-adapter 8. The connection of the duplexer-adapter 8 to the ends 9 11 and 9 12 is effected for example by connecting the shielding of these ends to the common ground 12 of the duplexer-adapter 8 and by connecting the cores of the ends 9 11 and 9 12 of this line coaxial respectively to the input terminal 8 1 and the output terminal 8 2 of the VHF channel of the duplexer-adapter 8. This duplexer- The adapter comprises a low-pass filter 13 which behaves as a direct connection between the input terminals 8 1 and 82 for the VHF signals and an open circuit for the UHF signals. For the VHF signals, everything happens as if the cut made in the line section 9 1 did not exist and the VHF signals can therefore be brought to the supply device 4. On the other hand, the high-pass filter 14 of the duplexer-adapter behaves as a direct connection between the input terminal 8 1 and the output terminal 8 3 of the UHF channel for the UHF signals which are thus taken from the input terminal 8 1 to be brought up to the output terminal 8 3 .

    Un exemple détaillé d'un duplexeur-adaptateur est donné à la figure 6.A detailed example of a duplexer-adapter is given to the figure 6.

    Entre l'extrémité 912 du tronçon de ligne et le repère supérieur 102, plusieurs éléments creux, tels que des tubes cylindriques 15i sont par exemple disposés autour de la ligne coaxiale afin de constituer des éléments rayonnants pour les signaux UHF. La longueur L de ces éléments est par exemple de l'ordre de la demi-longueur d'onde moyenne correspondant à la bande UHF Les éléments ont par exemple des longueurs sensiblement identiques. Les pièces isolantes servant à maintenir la ligne coaxiale dans les tubes cylindriques ou à assurer l'assemblage et la rigidité de l'ensemble ne sont pas détaillées, car elles sont connues de l'Homme du métier. Les éléments rayonnants 15i sont reliés les uns aux autres, à l'aide de portions 16i de ligne coaxiale, par exemple ils sont couplés en série. La longueur d'une portion 16i est sensiblement égale à la demi-longueur d'onde moyenne correspondant à la bande UHF. L'âme 17i d'une portion 16i relie l'extrémité supérieure 15i2 de l'élément 15i à l'extrémité inférieure 15(i+1)1 de l'élément 15(i+1). Ainsi, l'âme 171 de la portion de ligne 161 relie l'extrémité supérieure 1512 de l'élément inférieur 151 à l'extrémité inférieure 1521 de l'élément 152 et l'âme 172 de la portion de ligne 162 relie l'extrémité supérieure 1522 de l'élément 152 à l'extrémité inférieure 1531 de l'élément 153. Les blindages 181 et 182 des portions de ligne 161 et 162 sont reliés par exemple électriquement au blindage de la ligne coaxiale 91. L'ensemble rayonnant constitué par exemple des tubes cylindriques 151, 152 et 153 et des portions de liaison 161 et 162 est alimenté en puissance RF de la bande UHF en connectant l'extrémité inférieure 1511 de l'élément creux cylindrique 151 le plus proche du duplexeur-adaptateur à la borne de sortie 83 du duplexeur-adaptateur. Afin d'isoler radioélectriquement la partie supérieure de cet ensemble rayonnant de la partie de la ligne coaxiale située au-dessus du repère supérieur 102 un couvercle 19 est placé par exemple vers le milieu du tube supérieur 153 pour court circuiter ce dernier au blindage de la ligne coaxiale. Une jupe quart d'onde 20 de type de celle dans la partie inférieure est ainsi constituée pour assurer le rôle de bloqueur de courant pour les signaux UHF.Between the end 9 12 of the line portion and the upper marker 102, several hollow elements, such as cylindrical tubes 15i are for example arranged around the coaxial line to form radiating elements for the UHF signals. The length L of these elements is for example of the order of the average half-wavelength corresponding to the UHF band. The elements have, for example, substantially identical lengths. Insulating parts used to maintain the coaxial line in the cylindrical tubes or to ensure the assembly and rigidity of the assembly are not detailed because they are known to those skilled in the art. The radiating elements 15i are connected to each other by means of portions 16i of coaxial line, for example they are coupled in series. The length of a portion 16i is substantially equal to the half-average wavelength corresponding to the UHF band. The core 17i of a portion 16i connects the upper end 15 i2 of the element 15 i to the lower end 15 (i + 1) 1 of the element 15 (i + 1) . Thus, the web 17 1 1 line 16 connects the upper portion 15, 12 of the lower member end 15 1 to the lower end 15, 21 of the element 15 2 and the web 17 2 of the portion line 16 2 connects the upper end 22 of the element 2 to the lower end 31 of the element 3 . The shields 18 1 and 18 2 of the line portions 16 1 and 16 2 are electrically connected, for example, to the shield of the coaxial line 9 1 . The radiating assembly consisting for example of cylindrical tubes 15 1 , 15 2 and 15 3 and connecting portions 16 1 and 162 is supplied with RF power of the UHF band by connecting the lower end 11 of the cylindrical hollow element 15 1 closest to the duplexer-adapter to the output terminal 8 3 of the duplexer-adapter. In order to radio-isolate the upper part of this radiating assembly from the part of the coaxial line situated above the upper mark 2, a cover 19 is placed for example towards the middle of the upper tube 3 to short circuit the latter to the shielding of the coaxial line. A quarter-wave skirt 20 of the type in the lower part is thus formed to act as a current blocker for the UHF signals.

    Le nombre des tubes cylindriques est choisi notamment en fonction de la directivité souhaitée pour l'antenne UHF. Sans sortir du cadre de l'invention, la structure de l'antenne décrite s'applique aussi pour des antennes fonctionnant dans d'autres bandes de fréquences, tout en respectant la condition que ces bandes de fréquences ne soient pas adjacentes. Tout élément creux quelque soit sa forme peut être utilisé comme élément rayonnant.The number of cylindrical tubes is chosen in particular depending on the directivity desired for the UHF antenna. Without leaving the frame of the invention, the structure of the antenna described also applies for antennas operating in other frequency bands, while respecting the condition that these frequency bands are not adjacent. Any hollow element whatever its shape can be used as a radiating element.

    La figure 5 décrit un exemple de dispositif d'alimentation 4. Ce dernier comporte un transformateur d'impédance 21 dont la sortie 22 de son enroulement secondaire 23 est connectée à l'élément rayonnant supérieur 1. L'enroulement primaire 24 de ce transformateur élévateur d'impédance est connecté au point de connexion 25 à l'âme de la ligne de transmission 9 à travers un circuit LC parallèle 26 constitué d'une inductance 27 et d'une capacité 28, suivi d'un circuit LC série 29 constitué d'une inductance 30 et d'une capacité 31. La masse de ce circuit d'adaptation est reliée au blindage de la ligne de transmission coaxiale 9 au point de connexion 32. La valeur du rapport de transformation du transformateur 21 et les valeurs des inductances 27, 30 et des capacités 28, 31 sont déterminées pour que l'impédance présentée entre les points de connexion 25 et 32 soit le plus proche possible de l'impédance caractéristique usuelle de 50 ohms pour toutes les fréquences de la bande de 30 à 88 MHz.FIG. 5 depicts an example of a feed device 4. This last has an impedance transformer 21 whose output 22 of its secondary winding 23 is connected to the upper radiating element 1. The primary winding 24 of this step-up transformer is connected to the connection point 25 to the core of the transmission line 9 to through a parallel LC circuit 26 consisting of an inductor 27 and a capacitor 28, followed by a series LC circuit 29 consisting of an inductor 30 and 31. The mass of this matching circuit is connected to the shield from the coaxial transmission line 9 to the connection point 32. The value of the transformer transformation ratio 21 and the values of the inductances 27, 30 and capacitors 28, 31 are determined so that the impedance presented between connection points 25 and 32 is the most possible close to the usual characteristic impedance of 50 ohms for all frequencies in the band 30 to 88 MHz.

    La figure 6 détaille un exemple de réalisation du duplexeur-adaptateur. Le filtre passe-bas 13 est assuré par une portion 33 de ligne coaxiale dont une première extrémité 34 est en court-circuit (c'est-à-dire que l'âme et le blindage de la ligne coaxiale sont reliés ensemble) et constitue la borne 82 et dont l'extrémité opposée 35 a son âme connectée à la borne 81 et son blindage laissé libre. Le filtre passe-haut 14 est assuré par une portion 36 de ligne coaxiale dont le blindage 37 de son extrémité supérieure constitue la borne 83 et dont l'âme 38 de l'autre extrémité est connectée à la borne 81. Les longueurs des portions 33 et 36 sont de l'ordre de grandeur du quart de la longueur d'onde moyenne correspondant à la bande UHF et sont ajustées pour permettre l'adaptation d'impédance de l'ensemble antennaire 10 selon l'invention aux fréquences UHF utilisées.Figure 6 details an embodiment of the duplexer-adapter. The low-pass filter 13 is provided by a portion 33 of coaxial line of which a first end 34 is short-circuited (that is to say that the core and the shield of the coaxial line are connected together) and constitutes the terminal 8 2 and whose opposite end 35 has its soul connected to the terminal 8 1 and its shielding left free. The high-pass filter 14 is provided by a portion 36 of coaxial line whose shield 37 from its upper end constitutes the terminal 8 3 and whose core 38 of the other end is connected to the terminal 8 1 . The lengths of the portions 33 and 36 are of the order of magnitude of the quarter of the average wavelength corresponding to the UHF band and are adjusted to allow the impedance matching of the antenna assembly 10 according to the invention to UHF frequencies used.

    La figure 7 représente une autre variante de réalisation de l'invention.FIG. 7 represents another variant embodiment of the invention.

    L'antenne selon l'invention dispose ici de deux accès séparés permettant la connexion de deux postes émetteurs-récepteurs 71 et 72 fonctionnant l'un dans la bande VHF de 30 à 88 MHz l'autre dans la bande UHF de 2,4 à 2,5 GHz.The antenna according to the invention has here two separate accesses allowing the connection of two transceiver stations 7 1 and 7 2 operating one in the VHF band of 30 to 88 MHz and the other in the UHF band of 2, 4 to 2.5 GHz.

    Le poste 71 de la bande VHF est par exemple relié au dispositif d'alimentation 4 par la ligne de transmission coaxiale 9 qui traverse le bloqueur de courant 3 et un ensemble antennaire 10'.The station 7 1 of the VHF band is for example connected to the supply device 4 by the coaxial transmission line 9 which passes through the current blocker 3 and an antenna assembly 10 '.

    Le poste 72 de la bande UHF est par exemple relié aux éléments rayonnants 15i de l'ensemble antennaire 10' par le tronçon 9'1 de la ligne de transmission secondaire coaxiale 9' qui traverse le bloqueur de courant 3.The station 7 2 of the UHF band is for example connected to the radiating elements 15i of the antenna assembly 10 'by the section 9' 1 of the coaxial secondary transmission line 9 'which passes through the current blocker 3.

    Cet ensemble antennaire 10' dont les détails de conception sont reportés à la figure 8, ne comporte pas de duplexeur-adaptateur contrairement à l'ensemble antennaire donné à l'exemple précédent. Le tronçon 91 de ligne coaxiale reste ininterrompu entre le bloqueur de courant 3 et le dispositif d'alimentation 4. L'alimentation des éléments tubulaires rayonnants 15i est réalisée en connectant l'extrémité inférieure 1511 de l'élément 151 le plus proche du tronçon de ligne 9'1, à l'âme 9'A de ce tronçon 9'1 dont le blindage 9'B est solidaire de celui du tronçon 91 de la ligne coaxiale 9. De cette façon, les blindages des tronçons de lignes 91 et 9'1 se comportent radioélectriquement comme un blindage unique lors du passage à travers les bloqueurs de courant 3 et 11. L'autre extrémité de la ligne coaxiale secondaire est branchée au poste 72 émetteur-récepteur de la bande UHF.This antennal assembly 10 'whose design details are shown in Figure 8, does not include a duplexer-adapter unlike the antenna set given in the previous example. The section 9 1 of coaxial line remains uninterrupted between the current blocker 3 and the supply device 4. The supply of the tubular radiating elements 15i is made by connecting the lower end 15 11 of the element 15 1 nearest of the section of line 9 ' 1 , to the core 9' A of this section 9 ' 1 whose shielding 9' B is integral with that of the section 9 1 of the coaxial line 9. In this way, the shields of the sections of lines 9 1 and 9 ' 1 behave radioelectrically as a single shield when passing through the current blockers 3 and 11. The other end of the secondary coaxial line is connected to the station 7 2 transceiver of the UHF band.

    Les figures 9 et 10 schématisent une variante de réalisation décrite aux figures 7 et 8 où les deux émetteurs 71 et 72 sont remplacés par un unique émetteur 7 qui alimente directement la ligne de transmission 9. Cette ligne est interrompue de façon à positionner un duplexeur 8 de manière semblable par exemple à celle décrite à la figure 4. Ce duplexeur alimente les deux tronçons de ligne 91 et 9'1 qui ont été détaillées aux figures 7 et 8.FIGS. 9 and 10 schematize an alternative embodiment described in FIGS. 7 and 8 where the two emitters 7 1 and 7 2 are replaced by a single emitter 7 which directly supplies the transmission line 9. This line is interrupted so as to position a duplexer 8 in a manner similar to that described in Figure 4. This duplexer feeds the two line sections 9 1 and 9 ' 1 which were detailed in Figures 7 and 8.

    La figure 10 montre en détail la liaison entre le duplexeur 8 et les tronçons de ligne 91 et 9'1.FIG. 10 shows in detail the connection between the duplexer 8 and the line sections 9 1 and 9 ' 1 .

    La connexion du duplexeur-adaptateur 8 aux extrémités 911 et 912 du tronçon de ligne 91 interrompu s'effectue par exemple en reliant le blindage de ces extrémités à la masse commune 12 du duplexeur-adaptateur 8 et en branchant les âmes des extrémités 911 et 912 de cette ligne coaxiale respectivement à la borne d'entrée 81 et à la borne de sortie 82 de la voie VHF du duplexeur-adaptateur 8. Pour la liaison avec la ligne secondaire 9'1, cette dernière est en liaison avec la sortie 83 de la voie UHF. Ce duplexeur-adaptateur comporte un filtre passe-bas 13 qui se comporte comme une connexion directe entre les bornes d'entrée 81 et 82 pour les signaux VHF et un circuit ouvert pour les signaux UHF. Pour les signaux VHF, tout se passe comme si la coupure effectuée dans la ligne coaxiale 9 n'existait pas et les signaux VHF peuvent donc être amenés jusqu'au dispositif d'alimentation 4. Par contre le filtre passe-haut 14 du duplexeur-adaptateur se comporte comme une connexion directe entre la borne d'entrée 81 et la borne de sortie 83 de la voie UHF pour les signaux UHF qui sont donc prélevés depuis la borne d'entrée 81 pour être amenés jusqu'à la borne de sortie 83 afin d'alimenter le tronçon de ligne 9'1.The connection of the duplexer-adapter 8 to the ends 9 11 and 9 12 of the interrupted line section 9 1 is carried out for example by connecting the shielding of these ends to the common ground 12 of the duplexer-adapter 8 and connecting the ends of the cores 9 11 and 9 12 of this line coaxial respectively to the input terminal 8 1 and the output terminal 8 2 of the VHF channel of the duplexer-adapter 8. For the connection with the secondary line 9 ' 1 , the latter is in connection with the exit 8 3 of the UHF channel. This duplexer-adapter comprises a low-pass filter 13 which behaves as a direct connection between the input terminals 8 1 and 8 2 for the VHF signals and an open circuit for the UHF signals. For the VHF signals, everything happens as if the cut in the coaxial line 9 did not exist and the VHF signals can therefore be brought to the supply device 4. On the other hand, the high-pass filter 14 of the duplexer adapter behaves as a direct connection between the input terminal 8 1 and the output terminal 8 3 of the UHF channel for the UHF signals which are thus taken from the input terminal 8 1 to be brought to the terminal output 8 3 to supply the line section 9 ' 1 .

    Dans cet exemple le bloqueur de courant 11 dimensionné pour les fréquences UHF est situé sur les deux lignes de transmission 91 et 9'1 et au-dessus du duplexeur. Il comporte des caractéristiques identiques ou sensiblement identiques à celles données à la figure 4 et de fait ne seront pas détaillées.In this example, the current blocker 11 sized for the UHF frequencies is located on the two transmission lines 9 1 and 9 ' 1 and above the duplexer. It has characteristics identical or substantially identical to those given in Figure 4 and in fact will not be detailed.

    Claims (9)

    Système antennaire large bande, susceptible de rayonner ou de recevoir des signaux dans une bande de fréquence basse fréquence [Fbb, Fbh] couvrant plus d'une octave et une bande de fréquence haute fréquence [Fhb, Fhh], avec Fbh>=2Fhb, caractérisé en ce qu'il comporte au moins un dispositif d'alimentation (4) alimentant dans la bande de fréquence basse fréquence au moins un élément rayonnant supérieur (1) et un élément rayonnant inférieur (2) et en ce que l'élément rayonnant inférieur (2) est pourvu d'au moins un ensemble antennaire (10) adapté à rayonner dans la bande de fréquence haute fréquence [Fhb,Fhh].Broadband antenna system capable of radiating or receiving signals in a low frequency frequency band [Fbb, Fbh] covering more than one octave and a high frequency frequency band [Fhb, Fhh], with Fbh> = 2Fhb, characterized in that it comprises at least one supply device (4) supplying in the low frequency frequency band at least one upper radiating element (1) and one lower radiating element (2) and in that the radiating element lower (2) is provided with at least one antenna assembly (10) adapted to radiate in the high frequency frequency band [Fhb, Fhh]. Système selon la revendication 1 caractérisé en ce que le dispositif d'alimentation est relié à un poste émetteur-récepteur (7) au moyen d'une ligne de transmission (9) et en ce que l'élément rayonnant inférieur (2) est constitué d'un tronçon (91) de la ligne de transmission (9) et l'ensemble antennaire (10) comporte au moins un élément rayonnant creux (15i) disposé autour du tronçon (91).System according to Claim 1, characterized in that the supply device is connected to a transceiver station (7) by means of a transmission line (9) and in that the lower radiating element (2) consists of a section (9 1 ) of the transmission line (9) and the antenna assembly (10) comprises at least one hollow radiating element (15i) disposed around the section (9 1 ). Système selon la revendication 2 caractérisé en ce qu'il comporte plusieurs éléments creux (15i), lesdits éléments étant reliés entre eux et en série aux moyens de portions de ligne (16i), l'âme (17i) d'une portion (16i) reliant l'extrémité supérieure (15i2) de l'élément creux (15i) à l'extrémité inférieure 15(i+1)1 de l'élément 15i+1 et le blindage (18i) de la portion (16i) est relié à la ligne coaxiale (9).System according to claim 2 characterized in that it comprises a plurality of hollow elements (15i), said elements being interconnected and in series with the means of line portions (16i), the core (17i) of a portion (16i) ) connecting the upper end (15 i2 ) of the hollow member (15i) to the lower end (i + 1) 1 of the element i + 1 and the shield (18i) of the portion (16i) is connected to the coaxial line (9). Système antennaire selon l'une des revendications 1 à 3 caractérisé en ce qu'il comporte un duplexeur (8) au niveau de la partie inférieure de l'ensemble antennaire (10) et relié à au moins un élément creux (15i) et au tronçon (91).Antenna system according to one of claims 1 to 3, characterized in that it comprises a duplexer (8) at the lower part of the antenna assembly (10) and connected to at least one hollow element (15i) and to the section (9 1 ). Système antennaire selon la revendication 4 caractérisé en ce que le duplexeur (8) comporte au moins un filtre passe bas (13) constitué d'une portion (33) de ligne coaxiale court-circuitée et/ou au moins un filtre passe-haut (14) constitué d'une portion (36) de ligne coaxiale en circuit-ouvert.Antenna system according to Claim 4, characterized in that the duplexer (8) comprises at least one low-pass filter (13) consisting of a short-circuit coaxial line portion (33) and / or at least one high-pass filter ( 14) consisting of a portion (36) of open-circuit coaxial line. Système selon l'une des revendications 1 à 5 caractérisé en ce qu'il comporte un premier poste émetteur-récepteur (71) fonctionnant dans la bande de fréquence basse relié à une première ligne de transmission (9) et un deuxième poste émetteur-récepteur (72) fonctionnant dans la bande haute fréquence relié à une deuxième ligne de transmission coaxiale (9'), la deuxième ligne étant aussi en liaison avec un des éléments creux rayonnants, le blindage des deux lignes étant reliés ensemble.System according to one of claims 1 to 5 characterized in that it comprises a first transceiver station (7 1 ) operating in the low frequency band connected to a first transmission line (9) and a second transmitting station receiver (7 2 ) operating in the high frequency band connected to a second coaxial transmission line (9 '), the second line also being connected to one of the radiating hollow elements, the shielding of the two lines being connected together. Système antennaire selon l'une des revendications 1 à 6 caractérisé en ce qu'il comporte un bloqueur de courant tel qu'une jupe quart d'onde.Antenna system according to one of claims 1 to 6 characterized in that it comprises a current blocker such as a quarter-wave skirt. Système selon l'une des revendications 1 à 7 caractérisé en ce que le dispositif d'alimentation (4) comporte un transformateur d'impédance (21) et/ou au moins un circuit LC parallèle (26) et/ou au moins un circuit LC série (29).System according to one of Claims 1 to 7, characterized in that the power supply device (4) comprises an impedance transformer (21) and / or at least one parallel LC circuit (26) and / or at least one circuit LC series (29). Utilisation du système selon l'une des revendications 1 à 8 pour des signaux radio fréquences.Use of the system according to one of claims 1 to 8 for radio frequency signals.
    EP03100746A 2002-03-26 2003-03-24 VHF-UHF dual band antenna system Expired - Lifetime EP1349235B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    SI200330820T SI1349235T1 (en) 2002-03-26 2003-03-24 VHF-UHF dual band antenna system

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0203765A FR2837988B1 (en) 2002-03-26 2002-03-26 VHF-UHF BI-BAND ANTENNA SYSTEM
    FR0203765 2002-03-26

    Publications (2)

    Publication Number Publication Date
    EP1349235A1 true EP1349235A1 (en) 2003-10-01
    EP1349235B1 EP1349235B1 (en) 2007-03-07

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    Family Applications (1)

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    EP03100746A Expired - Lifetime EP1349235B1 (en) 2002-03-26 2003-03-24 VHF-UHF dual band antenna system

    Country Status (7)

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    US (1) US6836256B2 (en)
    EP (1) EP1349235B1 (en)
    AT (1) ATE356446T1 (en)
    DE (1) DE60312249D1 (en)
    ES (1) ES2283713T3 (en)
    FR (1) FR2837988B1 (en)
    SI (1) SI1349235T1 (en)

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    Also Published As

    Publication number Publication date
    ATE356446T1 (en) 2007-03-15
    FR2837988A1 (en) 2003-10-03
    ES2283713T3 (en) 2007-11-01
    FR2837988B1 (en) 2008-06-20
    US6836256B2 (en) 2004-12-28
    EP1349235B1 (en) 2007-03-07
    SI1349235T1 (en) 2007-08-31
    DE60312249D1 (en) 2007-04-19
    US20030227419A1 (en) 2003-12-11

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