EP0508299A1 - Portable transceiver with relevant device antenna - Google Patents

Portable transceiver with relevant device antenna Download PDF

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Publication number
EP0508299A1
EP0508299A1 EP92105634A EP92105634A EP0508299A1 EP 0508299 A1 EP0508299 A1 EP 0508299A1 EP 92105634 A EP92105634 A EP 92105634A EP 92105634 A EP92105634 A EP 92105634A EP 0508299 A1 EP0508299 A1 EP 0508299A1
Authority
EP
European Patent Office
Prior art keywords
antenna
walkie
spacer
device housing
joint
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
EP92105634A
Other languages
German (de)
French (fr)
Other versions
EP0508299B1 (en
Inventor
Reinhold Dipl.-Ing. Heiss
Thomas Dipl.-Ing. Molière
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0508299A1 publication Critical patent/EP0508299A1/en
Application granted granted Critical
Publication of EP0508299B1 publication Critical patent/EP0508299B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/245—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/084—Pivotable antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use

Definitions

  • the invention relates to a walkie-talkie with a transmitter / receiver and an associated device antenna.
  • Two-way radios have a wide range of uses, particularly as end portables in mobile telephone systems.
  • the physiological influence on the human body that occurs in the relevant frequency ranges is increasingly being addressed.
  • the problem is that a hand-held portable device radiates into the user's head with a normal operating position on the head and an antenna with a radiator length of approximately 80 mm.
  • the head acts as a shadow for the radiation of the antenna.
  • the invention has for its object to provide a solution with which these problems can be easily eliminated.
  • This object is achieved in a radiotelephone of the type described at the outset according to the invention by increasing the base of the effective antenna in such a way that the antenna consists of a non-radiating part connected to the device housing made of plastic (spacer) and a self-radiating part connected to it.
  • the antenna radiator is located above the top edge of the head and thus only exerts an insignificant physiological influence.
  • the antenna can develop its optimal directional characteristic.
  • Figure 1 shows an embodiment with a pivotable antenna.
  • the antenna consists of an elongated, non-radiating antenna base 2 (spacer) and a radiating antenna part of, for example, ⁇ / 2 length.
  • the antenna is attached to the side of the device housing 1 and can be pivoted via a joint 4. By swiveling the antenna in the direction of the arrow, it can be brought into a position on the side of the device housing in the rest position (dashed line).
  • Figure 2 shows an embodiment with a double-joint antenna (folding antenna).
  • the first antenna joint part 2 is a spacer, while the second joint section 3 represents the effective part of the antenna (radiator).
  • the entire antenna construction is detachably connected via a coaxial swivel joint 4 to the device housing 1, which is only partially shown in the figure.
  • a latching coaxial swivel joint 5 is attached between the first and the second part (spacer 2 and radiator 3).
  • the antenna is fully integrated into the housing design in the folded state (the spacer 2 lies on the top of the device, the radiator 3 on the left side of the device housing in the figure). This allows the device to be transported optimally. Damage during transport (e.g. in a bag) is largely avoided.
  • the antenna In this folded-in state, the antenna has limited functionality.
  • the radiator 3 By a rotation of the radiator 3 by 180 o, the "stand by" position of the antenna achieved.
  • the radiator 3 is in a position that extends the left side of the device housing. In areas with a good network infrastructure, calls can also be made in this antenna position if, for example, the radio is parked on a platform.
  • the antenna can also be designed as a telescopic antenna which has an elongated, non-radiating foot and can be inserted into a recess in the longitudinal direction of the device housing.
  • the antenna can also be designed as a screw-on or plug-on version.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Telephone Set Structure (AREA)
  • Burglar Alarm Systems (AREA)
  • Transceivers (AREA)

Abstract

When hand-portable transceivers are used in the normal operating position on the head, on the one hand radiation penetrates into the head of the user while on the other hand the head screens the radiation from the antenna. In order to overcome these effects, the base point of the effective antenna is raised in such a manner that the antenna consists of a non-radiating part (spacer) (2) which is connected to the device housing and of a self-radiating part (aerial) (3) connected thereto. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Funksprechgerät mit einem Sender/Empfänger und einer zugehörigen Geräteantenne.The invention relates to a walkie-talkie with a transmitter / receiver and an associated device antenna.

Funksprechgeräte haben eine vielfältige Anwendung, in besonderer Weise auch als Endportables in mobilen Telefoneinrichtungen. In diesem Zusammenhang wird vermehrt die in den betreffenden Frequenzbereichen auftretende physiologische Beeinflussung auf den menschlichen Körper angesprochen. Das Problem besteht darin, daß ein Handportable bei normaler Betriebshaltung am Kopf und einer Antenne mit ca. 80 mm Strahlerlänge in den Kopf des Benutzers einstrahlt. Außerdem wirkt der Kopf abschattend für die Abstrahlung der Antenne.Two-way radios have a wide range of uses, particularly as end portables in mobile telephone systems. In this context, the physiological influence on the human body that occurs in the relevant frequency ranges is increasingly being addressed. The problem is that a hand-held portable device radiates into the user's head with a normal operating position on the head and an antenna with a radiator length of approximately 80 mm. In addition, the head acts as a shadow for the radiation of the antenna.

Der Erfindung liegt die Aufgabe zugrunde, eine Lösung zu schaffen, mit der diese Probleme in einfacher Weise ausgeräumt werden können.The invention has for its object to provide a solution with which these problems can be easily eliminated.

Diese Aufgabe wird bei einem Funkssprechgerät der eingangs beschriebenen Art gemäß der Erfindung gelöst durch eine Erhöhung des Fußpunktes der wirksamen Antenne derart, daß die Antenne aus einem mit dem Gerätegehäuse verbundenen nicht strahlenden Teil aus Kunststoff (Abstandshalter) und einem daran angeschlossenen selbststrahlenden Teil besteht.This object is achieved in a radiotelephone of the type described at the outset according to the invention by increasing the base of the effective antenna in such a way that the antenna consists of a non-radiating part connected to the device housing made of plastic (spacer) and a self-radiating part connected to it.

Durch die Fußpunkterhöhung der wirksamen Antenne wird erreicht, daß sich der Antennenstrahler über der Kopfoberkante befindet und somit nur noch eine unbedeutende physiologische Beeinflussung ausübt. Zudem kann die Antenne ihre optimale Richtcharakteristik entfalten.By increasing the base of the effective antenna, it is achieved that the antenna radiator is located above the top edge of the head and thus only exerts an insignificant physiological influence. In addition, the antenna can develop its optimal directional characteristic.

Vorteilhafte Ausgestaltungen und Weiterbildungen des Erfindungsgegenstandes sind in den Unteransprüchen angegeben.Advantageous refinements and developments of the subject matter of the invention are specified in the subclaims.

Nachstehend wird die Erfindung anhand von in der Zeichnung dargestellen Ausführungsbeispielen näher erläutert.The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawing.

Figur 1 zeigt eine Ausführungsform mit einer schwenkbaren Antenne. Die Antenne besteht aus einem verlängerten, nichtstrahlenden Antennenfuß 2 (Abstandshalter) und einem strahlendem Antennenteil von beispielsweise λ/2 Länge. Die Antenne ist seitlich am Gerätegehäuse 1 angebracht und über ein Gelenk 4 schwenkbar. Durch Schwenken der Antenne in Pfeilrichtung kann sie in Ruhestellung in eine seitlich am Gerätegehäuse liegende Position gebracht werden (strichlierte Darstellung).Figure 1 shows an embodiment with a pivotable antenna. The antenna consists of an elongated, non-radiating antenna base 2 (spacer) and a radiating antenna part of, for example, λ / 2 length. The antenna is attached to the side of the device housing 1 and can be pivoted via a joint 4. By swiveling the antenna in the direction of the arrow, it can be brought into a position on the side of the device housing in the rest position (dashed line).

Figur 2 zeigt eine Ausführungsform mit einer Doppelgelenkantenne (Faltantenne). Das erste Antennengelenkteil 2 ist ein Abstandshalter, während der zweite Gelenkabschnitt 3 den wirksamen Teil der Antenne (Strahler) darstellt. Die gesamte Antennenkonstruktion wird über ein Koaxdrehgelenk 4 mit dem in der Figur nur teilweise dargestellten Gerätegehäuse 1 lösbar verbunden. Zwischen dem ersten und dem zweiten Teil (Abstandshalter 2 und Strahler 3) ist ein rastendes Koaxdrehgelenk 5 angebracht.Figure 2 shows an embodiment with a double-joint antenna (folding antenna). The first antenna joint part 2 is a spacer, while the second joint section 3 represents the effective part of the antenna (radiator). The entire antenna construction is detachably connected via a coaxial swivel joint 4 to the device housing 1, which is only partially shown in the figure. A latching coaxial swivel joint 5 is attached between the first and the second part (spacer 2 and radiator 3).

Die Antenne ist im eingeklappptes Zustand (der Abstandshalter 2 liegt an der Geräteoberseite an, der Strahler 3 an der in der Figur linken Gerätegehäuseseite) völlig in das Gehäusedesign integriert. Damit kann das Geräte optimal transportiert werden. Eine Beschädigung im Transportzustand (z. B. in einer Tasche) wird dadurch weitestgehend vermieden. In diesem eingeklappten Zustand ist die Antenne eingeschränkt funktionsfähig. Durch eine Drehung des Strahlers 3 um 180o wird die "stand by"-Position der Antenne erreicht. Der Strahler 3 befindet sich hierbei in einer Position, die in Verlängerung der linken Gerätegehäuseseite verläuft. In Gebieten mit einer guten Netz-Infrastruktur kann in dieser Antennenposition auch telefoniert werden, wenn beispielsweise das Sprechfunkgerät auf einer Plattform abgestellt ist.The antenna is fully integrated into the housing design in the folded state (the spacer 2 lies on the top of the device, the radiator 3 on the left side of the device housing in the figure). This allows the device to be transported optimally. Damage during transport (e.g. in a bag) is largely avoided. In this folded-in state, the antenna has limited functionality. By a rotation of the radiator 3 by 180 o, the "stand by" position of the antenna achieved. The radiator 3 is in a position that extends the left side of the device housing. In areas with a good network infrastructure, calls can also be made in this antenna position if, for example, the radio is parked on a platform.

Durch eine weitere Parallelverschiebung des Strahlers 3 wird die in Figur 2 dargestellte ausgeklappte Endposition erreicht.The extended end position shown in FIG. 2 is reached by a further parallel displacement of the radiator 3.

Neben den in den Figuren 1 und 2 dargestellten Versionen einer schwenkbaren und faltbaren Antenne läßt sich die Antenne auch als Teleskopantenne ausbilden, die einen verlängerten, nichtstrahlenden Fuß aufweist und in eine Ausnehmung in Längsrichtung des Gerätegehäuses einschiebbar ist. Ferner kann die Antenne auch als aufschraubbare oder aufsteckbare Version ausgebildet werden.In addition to the versions of a pivotable and foldable antenna shown in Figures 1 and 2, the antenna can also be designed as a telescopic antenna which has an elongated, non-radiating foot and can be inserted into a recess in the longitudinal direction of the device housing. Furthermore, the antenna can also be designed as a screw-on or plug-on version.

Claims (8)

Funksprechgerät mit einem Sender/Empfänger und einer zugehörigen Geräteantenne, gekennzeichnet durch eine Erhöhung des Fußpunktes der wirksamen Antenne derart, daß die Antenne aus einem mit dem Gerätegehäuse verbundenen nichtstrahlenden Teil (Abstandshalter) und einem daran angeschlossenen selbststrahlenden Teil (Strahler) Länge besteht.Two-way radio with a transmitter / receiver and an associated device antenna, characterized by an increase in the base point of the effective antenna in such a way that the antenna consists of a non-radiating part (spacer) connected to the device housing and a self-radiating part (radiator) connected to it. Funksprechgerät nach Anspruch 1,
dadurch gekennzeichnet,
daß die Antenne als Ein- oder Mehrgelenkantenne (Faltantenne) ausgebildet ist mit einer Gelenkverbindung des Abstandshalters am Gerätegehäuse.Walkie-talkie according to claim 1,
characterized,
that the antenna is designed as a single or multi-joint antenna (folding antenna) with an articulated connection of the spacer on the device housing. Funksprechgerät nach Anspruch 2,
dadurch gekennzeichnet,
daß bei einer Ausbildung als Doppelgelenkantenne der erste Antennengelenkteil vom Abstandshalter und der zweite Gelenkabschnitt vom Strahler gebildet wird.Walkie-talkie according to claim 2,
characterized,
that in a training as a double joint antenna, the first antenna joint part is formed by the spacer and the second joint section by the radiator. Funksprechgerät nach Anspruch 3,
dadurch gekennzeichnet,
daß das Gelenk zwischen Abstandshalter und Strahler ein rastendes Drehgelenk ist.Walkie-talkie according to claim 3,
characterized,
that the joint between the spacer and the radiator is a locking swivel. Funksprechgerät nach Anspruch 1,
dadurch gekennzeichnet,
daß die Antenne am Gerätegehäuse schwenkbar angeordnet ist.Walkie-talkie according to claim 1,
characterized,
that the antenna is pivotally arranged on the device housing. Funksprechgerät nach Anspruch 1,
dadurch gekennzeichnet,
daß die Antenne in eine in Längsrichtung des Gerätegehäuses verlaufende Ausnehmung einschiebbar ist.Walkie-talkie according to claim 1,
characterized,
that the antenna can be inserted into a recess running in the longitudinal direction of the device housing. Funksprechgerät nach Anspruch 1,
dadurch gekennzeichnet,
daß die Antenne am Gerätegehäuse aufschraubbar oder aufsteckbar angeordnet ist.Walkie-talkie according to claim 1,
characterized,
that the antenna is screwed or plugged onto the device housing. Funksprechgerät nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß der Abstandshalter aus einem Koaxialteil besteht.Walkie-talkie according to one of claims 1 to 7,
characterized,
that the spacer consists of a coaxial part.
EP92105634A 1991-04-10 1992-04-01 Portable transceiver with relevant device antenna Expired - Lifetime EP0508299B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4111717 1991-04-10
DE4111717 1991-04-10

Publications (2)

Publication Number Publication Date
EP0508299A1 true EP0508299A1 (en) 1992-10-14
EP0508299B1 EP0508299B1 (en) 1996-02-07

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EP92105634A Expired - Lifetime EP0508299B1 (en) 1991-04-10 1992-04-01 Portable transceiver with relevant device antenna

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Country Link
EP (1) EP0508299B1 (en)
AT (1) ATE134073T1 (en)
DE (1) DE59205270D1 (en)
DK (1) DK0508299T3 (en)
ES (1) ES2083013T3 (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221121C1 (en) * 1992-06-26 1993-10-21 Siemens Ag Hand-held mobile communications radio - uses electric motor for automatic alignment of antenna with reception station to maintain transmission strength
EP0603081A1 (en) * 1992-12-17 1994-06-22 Alcatel N.V. Portable radio telephone with means for protecting its user from electromagnetic radiation
EP0603012A1 (en) * 1992-12-18 1994-06-22 Nec Corporation Portable telephone set
FR2702324A1 (en) * 1993-03-01 1994-09-09 Picogica Sa Portable radiotelephony transmitter/receiver
WO1994021053A1 (en) * 1993-03-12 1994-09-15 Dickie Robert G Antenna fixture for hand-held cellular telephones
GB2280322A (en) * 1993-07-23 1995-01-25 Nec Corp Reducing interaction between the aerial of a portable radio telephone and user's head
EP0644607A1 (en) 1993-09-14 1995-03-22 Space Systems / Loral, Inc. Mobile communication terminal having deployable antenna
EP0650282A1 (en) * 1993-09-23 1995-04-26 AT&T Corp. Automatic telescopic antenna mechanism
EP0652646A1 (en) * 1993-11-05 1995-05-10 AT&T Corp. Apparatus for maintaining an antenna vertical in portable communication devices
EP0661825A1 (en) * 1993-12-28 1995-07-05 Nec Corporation Portable radio apparatus with rotating antenna
EP0675562A1 (en) * 1994-03-30 1995-10-04 Deutsche Telekom AG Antenna for handheld mobile communication apparatus with means for protecting its user from electromagnetic radiation
EP0689297A1 (en) 1994-06-24 1995-12-27 Siemens Aktiengesellschaft Portable radio transceiver
US5535435A (en) * 1994-07-11 1996-07-09 Motorola, Inc. Communication device using antenna having an offset
US5551069A (en) * 1992-08-05 1996-08-27 Nokia Mobile Phones Ltd. Radio apparatus having a combined antenna and clip
US5590416A (en) * 1995-06-08 1996-12-31 Ericsson Inc. Canted antenna for a cellular radiotelephone
WO1997002621A1 (en) * 1995-07-05 1997-01-23 Motorola Israel Limited Antenna assembly and communications device
EP0764998A1 (en) * 1995-09-22 1997-03-26 Mitsubishi Denki Kabushiki Kaisha Antenna device
EP0806809A1 (en) * 1995-01-28 1997-11-12 Lei Wang Hand-held communication equipment with a radiation shielding antenna apparatus
GB2314211A (en) * 1996-06-10 1997-12-17 Paul Anthony Taylor Antenna for a mobile telephone
GB2319417A (en) * 1993-07-23 1998-05-20 Nec Corp Mobile telephone with curved aerial to reduce interaction with user's head
US5977928A (en) * 1998-05-29 1999-11-02 Telefonaktiebolaget Lm Ericsson High efficiency, multi-band antenna for a radio communication device
GB2342506A (en) * 1998-10-09 2000-04-12 Thames Computing Limited Mobile telephone aerial
GB2353413A (en) * 1999-08-16 2001-02-21 Nec Technologies Jointed antenna
GB2373140A (en) * 2000-12-12 2002-09-11 Nec Corp Portable telephone and data communication control method which detects presence of object causing deterioration in antenna efficiency

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19723331B4 (en) * 1997-06-04 2010-11-11 Ipcom Gmbh & Co. Kg radio set

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US4134120A (en) * 1976-10-12 1979-01-09 Coastal Engineered Products Company, Inc. Whip antenna formed of electrically conductive graphite strands embedded in a resin material
EP0070150B1 (en) * 1981-07-10 1990-04-18 BRG Mechatronikai Vállalat Antenna arrangement for personal radio transceivers
EP0372720A1 (en) * 1988-11-08 1990-06-13 Kabushiki Kaisha Toshiba Extendable antenna device
EP0433172A2 (en) * 1989-12-13 1991-06-19 Canon Kabushiki Kaisha Electrophotographic photosensitive member

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221121C1 (en) * 1992-06-26 1993-10-21 Siemens Ag Hand-held mobile communications radio - uses electric motor for automatic alignment of antenna with reception station to maintain transmission strength
US5551069A (en) * 1992-08-05 1996-08-27 Nokia Mobile Phones Ltd. Radio apparatus having a combined antenna and clip
EP0603081A1 (en) * 1992-12-17 1994-06-22 Alcatel N.V. Portable radio telephone with means for protecting its user from electromagnetic radiation
EP0603082A1 (en) * 1992-12-17 1994-06-22 Alcatel N.V. Portable radio telephone with means for protecting its user from electromagnetic radiation
FR2699773A1 (en) * 1992-12-17 1994-06-24 Alsthom Cge Alcatel Portable radio transmitter.
US5493704A (en) * 1992-12-17 1996-02-20 Alcatel N.V. Portable communications transmitter
EP0603012A1 (en) * 1992-12-18 1994-06-22 Nec Corporation Portable telephone set
US5404390A (en) * 1992-12-18 1995-04-04 Nec Corporation Portable telephone set
FR2702324A1 (en) * 1993-03-01 1994-09-09 Picogica Sa Portable radiotelephony transmitter/receiver
WO1994021053A1 (en) * 1993-03-12 1994-09-15 Dickie Robert G Antenna fixture for hand-held cellular telephones
GB2280322B (en) * 1993-07-23 1998-08-05 Nec Corp Portable radio apparatus
US5926748A (en) * 1993-07-23 1999-07-20 Nec Corporation Portable radio apparatus capable of keeping antenna away from user when calling
GB2319417B (en) * 1993-07-23 1998-08-05 Nec Corp Portable radio apparatus
GB2319417A (en) * 1993-07-23 1998-05-20 Nec Corp Mobile telephone with curved aerial to reduce interaction with user's head
GB2280322A (en) * 1993-07-23 1995-01-25 Nec Corp Reducing interaction between the aerial of a portable radio telephone and user's head
EP0644607A1 (en) 1993-09-14 1995-03-22 Space Systems / Loral, Inc. Mobile communication terminal having deployable antenna
US5513383A (en) * 1993-09-14 1996-04-30 Space Systems/Loral, Inc. Mobile communication terminal having extendable antenna
EP0650282A1 (en) * 1993-09-23 1995-04-26 AT&T Corp. Automatic telescopic antenna mechanism
US5523766A (en) * 1993-11-05 1996-06-04 At&T Corp. Apparatus for maintaining antenna polarization in portable communication devices
EP0652646A1 (en) * 1993-11-05 1995-05-10 AT&T Corp. Apparatus for maintaining an antenna vertical in portable communication devices
US5630211A (en) * 1993-12-28 1997-05-13 Nec Corporation Rotating antenna type portable radio apparatus
EP0661825A1 (en) * 1993-12-28 1995-07-05 Nec Corporation Portable radio apparatus with rotating antenna
EP0675562A1 (en) * 1994-03-30 1995-10-04 Deutsche Telekom AG Antenna for handheld mobile communication apparatus with means for protecting its user from electromagnetic radiation
EP0689297A1 (en) 1994-06-24 1995-12-27 Siemens Aktiengesellschaft Portable radio transceiver
US5535435A (en) * 1994-07-11 1996-07-09 Motorola, Inc. Communication device using antenna having an offset
EP0806809A1 (en) * 1995-01-28 1997-11-12 Lei Wang Hand-held communication equipment with a radiation shielding antenna apparatus
US5940039A (en) * 1995-01-28 1999-08-17 Wang; Lei A. Hand-held communication equipment with a radiation shielding antenna apparatus
EP0806809A4 (en) * 1995-01-28 1998-04-22 Lei Wang Hand-held communication equipment with a radiation shielding antenna apparatus
US5590416A (en) * 1995-06-08 1996-12-31 Ericsson Inc. Canted antenna for a cellular radiotelephone
US5929814A (en) * 1995-07-05 1999-07-27 Motorola, Inc. Antenna assembly and communications device
WO1997002621A1 (en) * 1995-07-05 1997-01-23 Motorola Israel Limited Antenna assembly and communications device
EP0764998A1 (en) * 1995-09-22 1997-03-26 Mitsubishi Denki Kabushiki Kaisha Antenna device
US5949377A (en) * 1995-09-22 1999-09-07 Mitsubishi Denki Kabushiki Kaisha Retractable, extendable and rotatable dual antenna system
GB2314211A (en) * 1996-06-10 1997-12-17 Paul Anthony Taylor Antenna for a mobile telephone
US5977928A (en) * 1998-05-29 1999-11-02 Telefonaktiebolaget Lm Ericsson High efficiency, multi-band antenna for a radio communication device
GB2342506A (en) * 1998-10-09 2000-04-12 Thames Computing Limited Mobile telephone aerial
GB2353413A (en) * 1999-08-16 2001-02-21 Nec Technologies Jointed antenna
GB2353413B (en) * 1999-08-16 2003-08-06 Nec Technologies Antenna arrangement
GB2373140A (en) * 2000-12-12 2002-09-11 Nec Corp Portable telephone and data communication control method which detects presence of object causing deterioration in antenna efficiency
GB2373140B (en) * 2000-12-12 2004-02-25 Nec Corp Portable telephone and data communication control method for portable telephone
US6778842B2 (en) 2000-12-12 2004-08-17 Nec Corporation Portable telephone and data communication control method for portable telephone

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EP0508299B1 (en) 1996-02-07
DE59205270D1 (en) 1996-03-21
DK0508299T3 (en) 1996-03-18
ES2083013T3 (en) 1996-04-01
ATE134073T1 (en) 1996-02-15

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