EP0415703A1 - Système d'antenne pour un appareil radio-électrique portatif - Google Patents

Système d'antenne pour un appareil radio-électrique portatif Download PDF

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Publication number
EP0415703A1
EP0415703A1 EP90309385A EP90309385A EP0415703A1 EP 0415703 A1 EP0415703 A1 EP 0415703A1 EP 90309385 A EP90309385 A EP 90309385A EP 90309385 A EP90309385 A EP 90309385A EP 0415703 A1 EP0415703 A1 EP 0415703A1
Authority
EP
European Patent Office
Prior art keywords
antenna
construction
casing
antenna construction
earth plate
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
EP90309385A
Other languages
German (de)
English (en)
Other versions
EP0415703B1 (fr
Inventor
Yoshiharu Tamura
Takao Ono
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Publication of EP0415703A1 publication Critical patent/EP0415703A1/fr
Application granted granted Critical
Publication of EP0415703B1 publication Critical patent/EP0415703B1/fr
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
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • 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
    • 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
    • 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
    • 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
    • H01Q1/243—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 built-in antennas

Definitions

  • the present invention relates to an antenna system and, more particularly, to an antenna system for a portable radio telephone or similar portable radio apparatus.
  • the antenna may be bodily removed from the portable radio apparatus to allow the apparatus to be carried in a smaller configuration. This, however, brings about a problem that mounting and dismounting the antenna is troublesome, and a problem that the antenna physically separated from the apparatus can easily be lost. Moreover, the radio apparatus is practically unable to transmit or receive a radio signal without the antenna.
  • the antenna may be provided with a foldable structure to reduce the length of the radio apparatus.
  • a drawback with the foldable antenna scheme is that, in the folded position, the radiation characteristics of the antenna are effected by a shield structure and a printed circuit board which are usually incorporated in a radio apparatus, obstructing adequate transmission and reception. In addition, the antenna exposed to the outside at all times is not desirable for cosmetic reasons.
  • a telescopic antenna is another scheme for enhancing the portability of a portable radio apparatus. This type of antenna is telescoped into the casing, of the apparatus when a small antenna gain suffices.
  • a telescopic antenna lacks sufficient mechanical strength since the diameter thereof is extremely small at the tip. Such an antenna also requires an extra space for its accommodation in the casing of the apparatus., thus obstructing the miniaturization of the apparatus. Further, the radiation characteristics of the antenna are critically degraded when the antenna is telescopically retracted.
  • An antenna system for a portable radio apparatus of the present invention has a base plate or earth plate incorporated in the casing of the apparatus, a first antenna construction having an antenna element thereinside, and a second antenna construction.
  • the first antenna construction has a movable joint which allows it to move between a first position where it forms a part of the contour of the apparatus and a second position where it protrudes from the contour of the apparatus.
  • the second antenna construction corrects the antenna radiation characteristics and matching characteristics of the antenna.
  • the second antenna construction is affixed to the earch plate inside the casing.
  • a portable radio apparatus embodying the present invention which includes a casing 11.
  • a first antenna construction 12 is mechanically connected to the casing 11 and constitutes a major element of the antenna of the apparatus.
  • the first antenna construction 11 has an antenna element 13 which is the main element of an antenna reflector, and a movable joint 14 which serves as a part of the antenna reflector as well.
  • Incorporated in the casing 11 are a transmitter-receiver 15, an antenna feeder 16 interconnecting the transmitter-receiver 15 and the movable joint 14, a base plate or ground (earth) plate 17, and a second antenna construction 15.
  • the transmitter-receiver 15 has an antenna duplexer 19, a transmitting portion 20, a receiving portion 21, and a control portion 22 for controlling the transmitting and receiving portions 20 and 21.
  • the radio apparatus may further include a power supply portion and a dialling unit, not shown.
  • the first antenna construction 12 is movable between two different positions, i.e., a first position where the first antenna construction 12 is formed as a part of the contour of a casing 11 (Fig. 1(a)) and a second position where it is protruded from the casing 11 (Fig. 1(b)).
  • the first antenna construction 12 forms a part of the contour of the radio apparatus which is mainly defined by the casing 11.
  • the antenna element 13 is positioned close to the earth plate 17 which is incorporated in the casing 11 and has ground potential as shown in Fig. 1(a), and that the second antenna construction 15 is absent.
  • the antenna characteristics of the radio apparatus such as the antenna gain and radiation impedance would be changed and degraded, compared to the characteristics under the condition wherein the antenna element 13 is regarded as existing in free space.
  • the second antenna construction 15 serves to correct such antenna characteristics which would otherwise be degraded.
  • the second antenna construction 18 is so positioned, shaped and dimensioned as to implement adequate correction, which will be described in detail.
  • the first antenna construction 12 may be rotated by the movable joint 14 to the second position where it protrudes from the contour of the casing 11.
  • the joint 14 is of the type having a rotatable shaft, as well known in the art.
  • Fig. 1(b) does not show the internal arrangement of the casing 11 for clarity, it shows a specific configuration of the antenna element 13 which is disposed in the first antenna construction 12.
  • the antenna element 13 is provided with a hilical whip structure implemented with a metallic wire.
  • the antenna element 13 and the antenna construction 18 are spaced apart from each other and, therefore, electrically sparingly coupled with each other. It follows that the antenna characteristics of the radio apparatus are substantially determined by the characteristics of the antenna element 13. In the condition shown in Fig. 1(b), the antenna characteristics may be determined with no regard to the characteristics of the second antenna construction 18.
  • Fig. 3 shows in detail the first and second antenna constructions 12 and 18 determining the major characteristics of the antenna, and the earth plate 17.
  • the antenna construction has the antenna element 13 implemented with a metallic wire, a cover 23 made of a plastic or similar dielectric substance for protecting the antenna element 14, and the movable joint 14.
  • the casing 11 made of a plastic or similar substance is so configured and positioned as to isolate the first antenna construction 12 from the earth plate 17 and the second antenna construction 18.
  • the antenna feeder 16 is electrically connected at one end to the movable joint 14 and at the other end to the duplexer 19, Fig. 2.
  • the movable joint 14 is made of a metal and electrically connects the antenna element and feeder 13 and 16.
  • the movable joint 14 also mechanically fixes the casing 11 and the first antenna construction 18.
  • the developed length of the helical antenna element 13 is substantially one-fourth of the wavelength of the frequency used. Adjustment is made such that substantially optimal antenna characteristics are set up when the first antenna construction 12 is positioned as shown in Fig. 1(b). It is to be noted that the influence of the casing 11 and cover 23 on the antenna characteristics is negligible so long as they have a minimum of losses and are thin. On the other hand, when the antenna construction 12 is laid down to the position shown in Fig. 1(a), the antenna characteristics are noticeably effected. Specifically, should the second antenna construction 18 be absent, the first antenna gain would be reduced by more than 20 dB, compared to that in free space.
  • the second antenna construction 18 comprises a metallic wire which is electrically connected to the earth plate 17 at one end thereof.
  • the second antenna construction 15 is shaped, dimensioned and positioned in consideration of a necessary frequency and the band thereof, such that the first antenna construction 12 is adequately matched.
  • the second antenna construction 18 may be provided with a rectangular ring-like configuration and located in close proximity to the open end of the antenna element 13. This ring-like configuration is successful in reducing the distance between the earth plate 17 and the first antenna construction 12 and thereby the overall dimensions of the radio apparatus.
  • the second antenna construction 18 may be affixed to the earth plate 17 by a fixing member made of a plastic, for example.
  • the second antenna construction 18 plays the role of an inductance element and, therefore, compensates for a, capacitance component ascribable to the position of the first antenna construction 12 close to the earth plate 17.
  • the structure and electric characteristics of the second antenna construction 18 described above are only illustrative and may be selected in matching relation to the characteristics of the first antenna construction 12 and required antenna characteristics.
  • the earth plate 17 may be configured such that a part thereof forms a structural element of the first antenna construction 12.
  • Figs. 4(a) and 4(b) are representative of the results of specific measurements associated with the positions shown in Figs. 1(a) and 1(b), respectively.
  • the average gain Gav was measured to be -4.8 dBd (dBd: antenna gain normalized by dipole antenna gain) in the position of Fig. 1(a) and -3.5 dBd in the position of Fig. 1(b).
  • dBd antenna gain normalized by dipole antenna gain
  • This embodiment also has a first antenna construction 51 which is movable between two different positions, i.e., a first position where it is nested in a casing 52 (Fig. 5(a)) and a second position where it is protruded from the casing 52 (Fig. 5(b)).
  • the first antenna construction 51 bas thereinside an antenna element 53 having a flat plate-­like configuration.
  • a sliding mechanism 54 which per se is conventional is used to allow the antenna construction to move between the two positions as mentioned above.
  • the first antenna construction 51 and a second antenna construction 55 which determine the major characteristics of the antenna of the radio apparatus are shown in Fig. 6 in detail, together with a base plate or earth palte 56.
  • the antenna construction 51 has an antenna element 53, a cover 57 made of a plastic for protecting the antenna element 53, and one part of the slide mechanism 54.
  • the casing 52 isolates the second antenna construction 55 and earth plate 56 from the first antenna construction 51.
  • An antenna feeder 58 is connected in the neighborhood of the a side of the flat antenna element 53.
  • the total length of the sides of the antenna element 53 is selected to be substantially one-half of the wavelength of the frequency used.
  • the second antenna construction 55 is mechanically affixed and electrically connected to the earth plate 56 at a position which is substantially one-fourth of the wavelength as measured from the side of the antenna element 53 which is closest to the position where the antenna feeder 58 is connected. More specifically, this position corresponds to the open end of the flat antenna and allows antenna matching to be s.et up most easily.
  • the second antenna construction 55 like the antenna construction 18 shown in Fig. 1, is implemented with a ring-like metallic wire which constitutes an inductance element. Again, as the antenna element 53 is moved toward the earth plate 56, the resulting capacitance component is compensated for by the second antenna construction 55. This is successful in preventing the antenna gain of the antenna of the radio equipment from being lowered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Transceivers (AREA)
EP90309385A 1989-08-29 1990-08-28 Système d'antenne pour un appareil radio-électrique portatif Expired - Lifetime EP0415703B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP223460/89 1989-08-29
JP22346089 1989-08-29

Publications (2)

Publication Number Publication Date
EP0415703A1 true EP0415703A1 (fr) 1991-03-06
EP0415703B1 EP0415703B1 (fr) 1995-01-04

Family

ID=16798498

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90309385A Expired - Lifetime EP0415703B1 (fr) 1989-08-29 1990-08-28 Système d'antenne pour un appareil radio-électrique portatif

Country Status (6)

Country Link
EP (1) EP0415703B1 (fr)
JP (2) JP2919024B2 (fr)
KR (1) KR920010205B1 (fr)
AU (1) AU640404B2 (fr)
CA (1) CA2024180C (fr)
DE (1) DE69015739T2 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5245350A (en) * 1991-07-13 1993-09-14 Nokia Mobile Phones (U.K.) Limited Retractable antenna assembly with retraction inactivation
EP0611199A1 (fr) * 1993-02-11 1994-08-17 Alcatel Mobile Communication France Radio émetteur-récepteur portable comportant une antenne ayant un diagramme de rayonnement practiquement vertical
GB2293278A (en) * 1994-09-15 1996-03-20 Motorola Inc Multi-component antenna
GB2293275A (en) * 1994-09-15 1996-03-20 Motorola Inc Two position fold-over dipole antenna
US5898933A (en) * 1991-07-12 1999-04-27 Motorola, Inc. Apparatus and method for generating a control signal responsive to a movable antenna
WO2000005780A1 (fr) * 1998-07-20 2000-02-03 Samsung Electronics Company, Limited Indicateur de reception portable pour systemes de radionavigation par satellite
WO2000038274A1 (fr) * 1998-12-21 2000-06-29 Ericsson, Inc. Configurations de couplage electrique d'antenne
US6232924B1 (en) 1998-12-21 2001-05-15 Ericsson Inc. Flat blade antenna and flip mounting structures
US6301489B1 (en) 1998-12-21 2001-10-09 Ericsson Inc. Flat blade antenna and flip engagement and hinge configurations
EP1143555A1 (fr) * 1998-11-17 2001-10-10 NEC Corporation Dispositif terminal portatif a embase reflechissante
WO2008039255A2 (fr) * 2006-09-25 2008-04-03 Apple Inc. Antenne bouton pour des dispositifs portatifs
CN110416690A (zh) * 2018-04-28 2019-11-05 Oppo广东移动通信有限公司 电子装置及电子装置的控制方法

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892483A (en) * 1996-03-15 1999-04-06 Ericsson Inc. Dual antenna arrangement for portable transceiver
DE19723331B4 (de) * 1997-06-04 2010-11-11 Ipcom Gmbh & Co. Kg Funkgerät
JP2000106502A (ja) * 1998-07-27 2000-04-11 Hoko Denshi Kk 無線機用アンテナ
JP3665239B2 (ja) * 1999-09-29 2005-06-29 松下電器産業株式会社 アンテナ装置及びカード型無線機
KR20020065717A (ko) * 2001-02-07 2002-08-14 삼성전자 주식회사 휴대용 무선단말기의 안테나 장치
KR20020053690A (ko) * 2001-04-12 2002-07-05 장응순 휴대폰용 스윙 안테나
KR100492197B1 (ko) * 2002-09-09 2005-05-30 주식회사 팬택 이동통신 단말기의 전자파 흡수율 감소용 안테나
JP2006229333A (ja) 2005-02-15 2006-08-31 Sony Corp 無線通信装置
KR100671302B1 (ko) * 2005-03-08 2007-01-19 삼성전자주식회사 모바일 디스플레이장치
US20080231520A1 (en) * 2007-03-22 2008-09-25 Zueck Joseph Modem card with three-dimensional antenna arrangement
JP6496939B2 (ja) 2014-07-07 2019-04-10 ソニー株式会社 載置台、通信装置、アンテナ特性補正部材、及び通信システム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313119A (en) * 1980-04-18 1982-01-26 Motorola, Inc. Dual mode transceiver antenna
US4860024A (en) * 1987-12-28 1989-08-22 Harada Kogyo Kabushiki Kaisha Antenna for a portable radiotelephone
EP0350006A2 (fr) * 1988-07-05 1990-01-10 Nec Corporation Structure d'antenne pour appareil radio portable

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121218A (en) * 1977-08-03 1978-10-17 Motorola, Inc. Adjustable antenna arrangement for a portable radio
US4868576A (en) * 1988-11-02 1989-09-19 Motorola, Inc. Extendable antenna for portable cellular telephones with ground radiator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313119A (en) * 1980-04-18 1982-01-26 Motorola, Inc. Dual mode transceiver antenna
US4860024A (en) * 1987-12-28 1989-08-22 Harada Kogyo Kabushiki Kaisha Antenna for a portable radiotelephone
EP0350006A2 (fr) * 1988-07-05 1990-01-10 Nec Corporation Structure d'antenne pour appareil radio portable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 258 (E-350)(1981) 16 October 1985, & JP-A-60 107903 (ZENERARU RESEARCH OBU EREKUTORONITSUKUSU) 13 June 1985, *

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898933A (en) * 1991-07-12 1999-04-27 Motorola, Inc. Apparatus and method for generating a control signal responsive to a movable antenna
US5245350A (en) * 1991-07-13 1993-09-14 Nokia Mobile Phones (U.K.) Limited Retractable antenna assembly with retraction inactivation
US5613224A (en) * 1993-02-11 1997-03-18 Alcatel Radiotelephone Portable mobile radio transceiver
EP0611199A1 (fr) * 1993-02-11 1994-08-17 Alcatel Mobile Communication France Radio émetteur-récepteur portable comportant une antenne ayant un diagramme de rayonnement practiquement vertical
FR2701613A1 (fr) * 1993-02-11 1994-08-19 Alcatel Radiotelephone Appareil émetteur-récepteur radiotéléphonique portatif.
US5561437A (en) * 1994-09-15 1996-10-01 Motorola, Inc. Two position fold-over dipole antenna
CN1071531C (zh) * 1994-09-15 2001-09-19 摩托罗拉公司 双位置折叠式偶极子天线
FR2724771A1 (fr) * 1994-09-15 1996-03-22 Motorola Inc Antenne a dipole repliable a deux positions
GB2293275B (en) * 1994-09-15 1998-07-15 Motorola Inc Two position fold-over dipole antenna
GB2293278B (en) * 1994-09-15 1998-07-15 Motorola Inc Multi-component antenna and method therefor
US5809433A (en) * 1994-09-15 1998-09-15 Motorola, Inc. Multi-component antenna and method therefor
GB2293275A (en) * 1994-09-15 1996-03-20 Motorola Inc Two position fold-over dipole antenna
GB2293278A (en) * 1994-09-15 1996-03-20 Motorola Inc Multi-component antenna
WO2000005780A1 (fr) * 1998-07-20 2000-02-03 Samsung Electronics Company, Limited Indicateur de reception portable pour systemes de radionavigation par satellite
EP1143555A1 (fr) * 1998-11-17 2001-10-10 NEC Corporation Dispositif terminal portatif a embase reflechissante
EP1143555A4 (fr) * 1998-11-17 2004-11-24 Nec Corp Dispositif terminal portatif a embase reflechissante
US6947762B1 (en) 1998-11-17 2005-09-20 Nec Corporation Portable terminal device with reflection board
US6232924B1 (en) 1998-12-21 2001-05-15 Ericsson Inc. Flat blade antenna and flip mounting structures
US6249688B1 (en) * 1998-12-21 2001-06-19 Ericcson Inc. Antenna electrical coupling configurations
WO2000038274A1 (fr) * 1998-12-21 2000-06-29 Ericsson, Inc. Configurations de couplage electrique d'antenne
US6301489B1 (en) 1998-12-21 2001-10-09 Ericsson Inc. Flat blade antenna and flip engagement and hinge configurations
WO2008039255A2 (fr) * 2006-09-25 2008-04-03 Apple Inc. Antenne bouton pour des dispositifs portatifs
WO2008039255A3 (fr) * 2006-09-25 2008-05-15 Apple Inc Antenne bouton pour des dispositifs portatifs
US7639187B2 (en) 2006-09-25 2009-12-29 Apple Inc. Button antenna for handheld devices
CN110416690A (zh) * 2018-04-28 2019-11-05 Oppo广东移动通信有限公司 电子装置及电子装置的控制方法

Also Published As

Publication number Publication date
AU6192590A (en) 1991-03-07
DE69015739T2 (de) 1995-08-17
JP3202690B2 (ja) 2001-08-27
JPH03219703A (ja) 1991-09-27
KR920010205B1 (ko) 1992-11-21
CA2024180C (fr) 1995-06-13
CA2024180A1 (fr) 1991-03-01
DE69015739D1 (de) 1995-02-16
EP0415703B1 (fr) 1995-01-04
KR910005511A (ko) 1991-03-30
JP2919024B2 (ja) 1999-07-12
JPH11186824A (ja) 1999-07-09
AU640404B2 (en) 1993-08-26

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