DE19824145A1 - Integrated antenna arrangement for mobile telecommunications terminal - Google Patents

Abstract

The antenna arrangement includes a casing that contains electronic components as well as screening and ground surface areas. A battery unit (1) comprises a metallic surface area, and is at least partially inserted into the casing. The metallic surface area of the battery unit forms at least part of an antenna. The metallic surface area forms preferably at least one resonator. A further metallic surface area, provided in the casing forms, an emitter base separated from the resonator through a dielectric material (2). A short-circuit stub (5) is provided between resonator and emitter base.

Description

The invention relates to an integrated antenna arrangement for mobile telecommunication devices such as radio telephones, hand radios, cordless phones, and the like, including a Device housing, elec. Arranged inside the device housing tronic components as well as screen and / or ground surfaces and insert at least partially into the device housing or insertable battery or accumulator unit, which a has metallic surface.

With portable communication terminals, e.g. B. mobile phones, the development trend is moving towards smaller and smaller ones, especially handy devices that are characterized by small dimensions and show a reduced mass. So it has already been suggested gen, mobile phones with a folding or sliding mechanism equip such that in standby mode parts of the Functional elements, e.g. B. the keyboard, lead covered ben to achieve protection of the controls and at the same time through the hinged or sliding housing halves to ensure the desired goal of reducing installation space. In the event of operation, d. H. while having a conversation under groove The cell phone must then be used to produce the optimum Distance between microphone and handset according to the Ent distance between mouth and ear of the folding or sliding mecha be operated.

As is known, mobile phones have rod-shaped antennas, e.g. B. λ / 2 radiator. These antennas are at least partially sufficient beyond the housing. If from constructive or design For technical reasons, it is desirable to move one half of the housing given upwards in the direction of the radiator, this leads to egg ner undesirable change in the reception and transmission properties properties of the device in question. Is particularly problematic this is when metal is in the sliding housing part  arranged surfaces and / or active electronic components are.

PCT-WO 95/24745 describes an antenna arrangement for a portable telecommunications terminal known, which inner half of the housing has a planar emitter. Such planar antennas have one or more λ / 4 long resona gates with short to ground. Such a planar antenna can be integrated into a housing without the provision a rod-shaped radiator outside the housing is such.

Since the electrical properties of a planar antenna are essential Lich the distance between the resonator and the base as well as the Properties of the dielectric depend, was according to WO 95/24745 proposed a separate dielectric body form, which both the resonator element and the Has floor space including feed connection. This separate dielectric body formed in this way is then Can be positioned at a suitable location within the housing.

In the solution described above, an additional one must be used Component are created, which a corresponding Ferti costs and costs. Use this component also takes up space inside the housing, what like corresponding to the desired miniaturization of corresponding tele communication terminals, especially radio telephones stands.

It is therefore an object of the invention to provide an integrated antenna arrangement for mobile telecommunication devices such as radio telephones, handheld radios, cordless telephones or the like to indicate which ones own no or only one occupies space within the terminal, its antennas adjustment can be easily optimized and which one Reduction of the specific high-frequency absorption rate in the Body of the user.  

The object of the invention is achieved with a Object in its definition according to the characteristics of the Claim 1, the subclaims at least include expedient refinements and developments.

An essential embodiment is an inte griert, planar antenna arrangement for a mobile telecommunications nikations-Terminal to obtain that metallic compo elements of an already necessary battery or an accumulator tors as a resonator or resonator surface of the planar radiator be used. Furthermore, the radiator base for the planar antenna of screen and / or ground surfaces of the inside electronic components located in the device housing or components are formed. As a dielectric takes place at a preferred embodiment a section of art fabric device housing use.

In a supplement can be formed instead of the dielectric through the device housing a special substrate in an ent speaking recess of the housing can be used. This Substrate can be metallized on one side to a defined Obtain radiator footprint for the planar antenna. Because the substrate also has mechanical properties Housing takes over, there is additional space for the antenna not used.

By means of a short circuit tube or a short circuit area between resonator and radiator base as well as one of this distant feed point can be Antenna resonance frequency depending on the design, especially the metallic surfaces acting as resonators the battery or accumulator. The feed the antenna can also be made via a transmission line.

In a further embodiment, at least parts of the Dielectric from sections of the plastic case, however also consist of the plastic battery compartment. It's over it furthermore in the sense of the invention, a plastic covering of  Accumulator or the battery as a defined dielectric to design or use.

Then when a change in the radiation characteristics of the planar antenna especially with a view to a reduction the specific absorption rate SAR in the user's body is desired, the radiator base encloses the Resona Partially laterally spaced, being between these lateral spacer and the resonator a dielectric is located. There is also the possibility to simple optimization of the antenna properties on the Side of the resonator facing away from the radiator base to apply dielectric cover, which for example from the part of the housing that closes the battery compartment exists or for this on the battery plastic sheathing is used. The width of the resonator can Correspond to the width of the base.

The mentioned dielectrics between resonator and beam base surface, the side facing away from the radiator base surface of the resonator and / or between the lateral spacing surface and the resonator can be the same, but also different Liche dielectric constants to a Reso to be able to adjust the frequency and antenna.

The operating voltage supply from the battery or the Accumulator to the telecommunications terminal is over a Filters consisting of an inductor and a capacitance (LC filter) performed to block high-frequency energy to reach.

Preferably, the electrical contact to the resonator and Radiator base coaxial or includes Coaxial fitting, the inner conductor to the resonator and the Shielding leads to the radiator base.

A variant of the invention is particularly useful in which via the positive operating voltage supply or the  corresponding electrical connection at the same time High-frequency energy is fed in, for this purpose in the High frequency connecting line a DC block capacitor is provided.

Instead of direct electrical contact there is the possibility of feeding the antenna through a to make indirect capacitive coupling.

To maintain or improve the directivity or Directional radiation, d. H. to influence the directional characteristics the planar antenna and to increase the bandwidth or to obtain two resonance frequencies (dual band) with at least one non-powered parasitic element interact, which is part of the device housing or was integrated into it.

With the above-described solution of using a battery or an accumulator or the one there metallic components, e.g. B. the metal jacket of a battery packs as a resonator of a planar antenna or part of a Antenna succeeds in a particularly simple way on one additional external radiator or a separate component for to do without an integrated spotlight. Cost reductions as well as the intended minimization of the installation space for public Use mobile phones are the result.

In particular in one embodiment of the invention, in which the radiator base area of the screen and / or ground areas of the electronic components, e.g. B. a circuit board or one other wiring carrier formed within the housing the field strength occurs in the near field to reduce so that the specific absorption rate (SAR) especially in the area of a user's head respective telecommunications terminal can be reduced can. With regard to the far field, the influence of the Radiation characteristics in relation to an undisturbed Spotlights are considered immaterial because according to the  Invention is provided a resonant system that optimal adjustment values are guaranteed.

The fact that located in the near field of the resonator metallic components, namely the shield and / or mass areas are deliberately part of the planar emitter, will have difficulty adjusting foot resistance related to the sending and receiving unit of the Telekommuni cations terminal excluded.

When designing the housing and choosing the location a battery or accumulator compartment is preferred upper part of the housing selected so that when using the Mobile phones the area of the active radiator not from Parts of the user's hand is covered.

In a further embodiment of the invention a battery unit, which is a rod or Has cylindrical shape. This battery unit is at least partially extending outside the device housing arranged. The metal shell of this rod or cylindrical gene battery unit forms a in this embodiment Rod antenna in the manner of a monopole or dipole or provides an axis of an omnidirectional helix antenna The axis of the omnidirectional helical antenna serves here the replica of a helix reflector tube.

The battery unit in rod or cylinder form can for the Formation of the antenna as a monopole or dipole, d. H. as a staff antenna designed to slide in and out of the housing become. For the high frequency supply line is either a flexible connection or a surface sliding contact provided for the metal jacket of the battery unit.

With the helix antenna form, the helix Helix in a manner known per se, the shielding being a coaxial feed on a metallic surface, which leads itself in the device housing in the vicinity of the helix axis located. This screen area can also be made of screen and / or  Ground areas are formed or include those that are anyway are technically present within the device housing.

The invention is intended below with reference to exemplary embodiments play and explained in more detail with the help of figures become.

Here show:

Figure 1 is a plan view, a side view and a cross-sectional view of a first game Ausführungsbei with a battery unit placed on the outside of the device housing.

Fig. 2 is a plan view and a schematic sectional view of an embodiment with a partially integrated in the Gerätegehäusewandung battery unit;

FIG. 3 shows an LC filter arranged on the positive battery feed point for the separation of undesirable high frequency components;

Figure 4 is a schematic representation of the combined DC and high-frequency feed the same battery contact.

Fig. 5 shows a rod antenna embodiment and

Fig. 6 shows a helix antenna with a battery unit as an axis or reflector.

In the embodiments described below from a planar, integrated antenna arrangement for one mobile telecommunication terminal, in particular radio telephone or mobile phone with a device housing. Inner half of the device housing are common electronic components and modules are provided to maintain functionality. Concealed  Backs of a circuit board for receiving electronic Components or circuits inside the device are arranged at the same time, act as a screen and / or ground plane.

The planar antenna to be implemented is based on a λ / 2 resonance nator, which is essentially parallel to one on ground laid base area and is suitably excited. In the moment when the resonator is short-circuited or Short-circuit stub is connected to the base on one side, a λ / 4 antenna is created. The feed is preferred made via a coaxial line, the shielding with the base and the inner or center conductor with the Reso nator is connected. By varying the distance from The antenna can be fed into the short circuit stub adjust fit. The resonance frequency of the antenna is by length and shape of the resonator, by the dielectric between resonator and base as well as through the arrangement the antenna on or in the device housing.

The top view according to FIG. 1 shows a battery unit 1 which, for example, consists of several metal-clad nickel-cadmium cells or Li-ion cells connected in series, which in turn are surrounded by a plastic sheath. The individual cells form a metallic surface, which in the exemplary embodiment is a resonator of a planar antenna arrangement.

The above-mentioned screen and / or ground surfaces 3 represent a radiator base for the planar antenna, with part of the housing acting as a dielectric 2 between the resonator and base. A short-circuit stub 5 connects the screen and / or ground surface to the metallic component of the battery unit 1 at a selected location. Spaced from the location of an antenna feed point 5 Kurzschlußstubs 4 is formed over a closing fitting Koaxialan.

The positive battery voltage potential is tapped at connection point 6 .

The battery unit 1 is not shown, known means, for. B. a SnapIn connection detachably attached to the housing. The electrical contacting at the point of the short-circuit stub 5 or at the antenna feed point 4 is implemented, for example, by a tip contact.

The illustrated integrated planar formed in this way Antenna arrangement is in an upper part of the Mobile radio device housing, which in the operating case of the user's hand is not regularly covered, so that an optimal radiation and therefore cheap transmission and Reception characteristics are guaranteed.

In the embodiment explained below with reference to FIG. 2, the battery unit 1 is received by a recess in the device housing. In this example, the screen and / or ground surface 3 projects laterally spaced around the battery unit 1 , with a dielectric in the space. By choosing the dielectric constant of a battery compartment cover 2-1 , corresponding to the section of the housing 2-3 and a dielectric insert 2-2 , the resonance frequency of the radiator can be set according to the conditions of use and the usual frequency spectra of the mobile telecommunications terminal devices . The dielectric 2-1 covering the battery unit 1 can be a battery compartment cover, but also a battery plastic covering.

In order to prevent high-frequency energy from being scattered in on the DC voltage side in the case of the planar antenna arrangement with a resonator, obtained by means of metallic surfaces of a battery unit, an LC filter is provided. This filter comprises an inductance 7 and a capacitance 8 connected in parallel to ground.

In order to simplify the electrical coupling of the planar antenna to the transceiver modules of the mobile telephone, there is the possibility of a combined direct voltage / high frequency supply according to FIG. 4. In this example, the high-frequency signal and the battery voltage are present at the same contact of the battery unit 1 or are tapped there. In this case, in addition to the LC filter 7 , 8 , a DC block capacitor 9 is looped into the high-frequency feed line or the antenna connection point 4 . The LC combination has a similar effect to that shown in FIG. 3, that the output for the positive battery voltage at the corresponding connection point 6 is free of high-frequency energy.

In a further version, not shown in the figure form there is the possibility of the planar antennas arrangement to capacitively couple indirectly, so that on elec trical contacts, realized by mechanical connections, can be dispensed with.

In the exemplary embodiments, a plastic dielectric was assumed, but an air dielectric can also be used if, for example, the battery unit 1 takes over mechanically supporting functions of the device housing in the arrangement section of the planar antenna.

An influence on the directional radiation characteristics and thus the antenna gain of the planar antenna can be successful gene that not fed parasitic elements or parasitic Resonators are provided. Such parasitic elements can be integrated into the device housing as metallic components be executed.

In the explanation according to the above embodiments tert integrated antenna arrangement is therefore from a metallic surface of the inserted in the device housing or battery unit to be used, the minimum forms a resonator for a planar radiator. One of this metallic resonator surface by a dielectric spaced, substantially parallel further metallic Surface is provided in the device housing and forms one Radiator base for the antenna.  

There is a between the resonator and the radiator base Short-circuit connection or a short-circuit stub provided, wherein from the short circuit stub according to the antenna resonance frequency removes an RF feed point, preferably in coaxial form, is arranged. The feed point represents the electrical con clock connection to the resonator on the one hand and to the radiator on the other hand.

The fact that both the radiator base and the Reso Nator area of functionally necessary, already existing construction groups of a telecommunications terminal are formed, experience this a multifunctional application, so that the Space that is otherwise available for external or discreet Antennas or radiators arranged in the housing is required is not required in addition. In the sense of this installation space reduction At least parts of the dielectric consist of Ab cut the plastic housing and / or a plastic Battery compartment or a plastic battery cover. Arranged in the housing or as the radiator base provided screen and / or ground surfaces used.

Interchangeable standardized battery units allow depending on the frequency or polarization application or Antenna cha corresponding to the respective coverage area to obtain characteristics without complex setting and Alignment work. By varying the high frequency coupling, the planar antenna can be used in several or different polarization planes vibrate, so that the universality in the use of appropriately equipped Mobile phones increased.

In the event of a need to fine tune the Reso As is usual with planar antennas, the frequency can be mecha nically adjustable element between resonator and radiator Base area should be provided.  

Surprisingly, it has been shown that the influence of the User when operating a telecommunications terminal with a planar antenna when holding the device in hand due to the spatial extent and thickness of the battery is or can be reduced. The main waiters surface currents in the resonator flow on the substrate or Dielectric side, so that field distortion and leg flow through the hand is less, so that in Ver better than the flat resonator of known planar antennas Sending and receiving properties result.

In the embodiment of FIG. 5, a rod antenna battery 11 is assumed. The corresponding battery unit can be at least partially pushed in and pushed out based on the housing surface 10 . The HF supply line 13 is realized either via a flexible connection or by means of a sliding contact based on the metallic surface of the battery unit. The battery connections 12 are completely separated from the HF feed line 14 and correspond to the known prior art. The rod antenna battery 11 has radiation properties of a monopole or dipole, it being possible to adapt the base resistance by means of transformation elements, if necessary.

A rod-shaped or cylindrical battery unit, as shown in FIG. 6, can also be used as a reflector tube of a helix antenna. The helix reflector tube 15 is in this case surrounded by the helix coil 13 , the helix coil 13 being connected to the center conductor of a coaxial HF feed line 14 . The shielding of this HF feed line 14 can lead to a shield and / or ground surface 3 , which is arranged below the housing surface 10 of the device housing.

Reference list

1

Battery unit

2nd

dielectric

3rd

Screen and / or ground area

4th

Antenna feed point

5

Short circuit stub

6

positive operating voltage connection point

7

Inductance

8th

capacity

9

DC block capacitor

10th

Housing surface

11

Rod antenna battery

12th

Battery connections

13

Helix helix

14

HF supply line

15

Helix reflector tube

Claims (17)

1. Integrated antenna arrangement for mobile telecommunications end devices such as radio telephones, handheld radios, cordless telephones or the like, comprising a device housing, electronic components arranged inside the device housing, and screen and / or ground planes and an at least partially insertable or insertable battery in the device housing - or accumulator unit, which has a metallic surface, characterized in that the metallic surface of the battery unit ( 1 ) inserted into the device housing or fastened to the housing is at least part of an antenna or an antenna antenna. 2. Integrated antenna arrangement according to claim 1, characterized in that the metallic surface of the battery unit inserted into the device housing ( 1 ) forms at least one resonator and a spacer provided by a dielectric ( 2 ) and provided in the device housing further metallic surface, whereby between the resonator and the radiator base a short circuit stub ( 5 ) is provided and from the short circuit stub ( 5 ) according to the antenna resonance frequency a feed point ( 4 ) is arranged, which has an electrical contact to the resonator and to the radiator base. 3. Integrated antenna arrangement according to claim 2, characterized in that at least parts of the dielectric ( 2 ) consist of sections of the plastic device housing ( 2-3 ) and / or a plastic battery compartment ( 2-1 ). 4. Integrated antenna arrangement according to claim 1, 2 or 3, characterized in that the radiator base surface is formed at least by parts of the housing arranged in the device screen and / or ground surfaces ( 3 ). 5. Integrated antenna arrangement according to one of the preceding claims made, characterized in that the radiator base as a coating on a separate dielectric substrate is applied, the coated substrate in the device housing in a recess is arranged such that when the battery unit is inserted comprising batteries and / or accumulators the antenna can be completed. 6. Integrated antenna arrangement according to one of the preceding claims, characterized in that the radiator base for changing the radiation characteristic encloses the resonator partially laterally spaced, with a further dielectric ( 2-2 ) being arranged between the lateral spacing surface and the resonator. 7. Integrated antenna arrangement according to one of the preceding claims, characterized in that the resonator on the side facing away from the radiator base has a dielectric cover ( 2-1 ). 8. Integrated antenna arrangement according to claim 7, characterized in that the dielectric cover ( 2-1 ) of the part closing the battery compartment of the device housing or a battery plastic sheath. 9. Integrated antenna arrangement according to claim 6, 7 and / or 8, characterized in that the dielectrics ( 2-1 , 2-2 , 2-3 ) for determining the resonance frequency and antenna adaptation can have different dielectric constants. 10. Integrated antenna arrangement according to one of the preceding claims, characterized in that an LC filter ( 7 , 8 ) for blocking high-frequency energy is arranged in the operating voltage supply. 11. Integrated antenna arrangement according to one of the previous claims, characterized in that the electrical contact to the resonator and the radiator base is coaxial or a coaxial fitting comprises, the inner conductor to the resonator and the shield leads to the radiator base. 12. Integrated antenna arrangement according to claim 10, characterized in that high-frequency energy is simultaneously fed via the positive operating voltage supply ( 6 ), for which purpose a DC block capacitor ( 9 ) is provided in the high-frequency connecting line. 13. Integrated antenna arrangement according to one of claims 1 until 10, characterized in that this is fed indirectly capacitively coupled. 14. Integrated antenna arrangement according to one of the previous claims, characterized in that to obtain directional radiation from the planar antenna has at least one non-fed parasitic element. 15. Integrated antenna arrangement according to claim 1, characterized in that the battery unit has a rod or cylindrical shape and is arranged at least partially extending outside the housing surface ( 10 ) of the device housing, the metal jacket of the battery unit having a rod antenna ( 11 ) in the manner of a monopoly or dipoles or an axis of an omnidirectional helix antenna. 16. Integrated antenna arrangement according to claim 15, characterized in that that the battery unit in relation to the device housing is arranged extendable. 17. Integrated antenna arrangement according to claim 15, characterized in that in the case of a helix antenna, the battery unit simulates a helix reflector tube ( 15 ).