WO2003044890A1 - Antenne doublet destinee a un dispositif de radio portatif - Google Patents

Antenne doublet destinee a un dispositif de radio portatif Download PDF

Info

Publication number
WO2003044890A1
WO2003044890A1 PCT/GB2002/005211 GB0205211W WO03044890A1 WO 2003044890 A1 WO2003044890 A1 WO 2003044890A1 GB 0205211 W GB0205211 W GB 0205211W WO 03044890 A1 WO03044890 A1 WO 03044890A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
wire conductor
flexible wire
dipole
headphones
Prior art date
Application number
PCT/GB2002/005211
Other languages
English (en)
Inventor
Andrew Jon Fell
Thomas Dominic Ormiston
Original Assignee
Psion Digital Limited
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 Psion Digital Limited filed Critical Psion Digital Limited
Priority to AU2002343041A priority Critical patent/AU2002343041A1/en
Publication of WO2003044890A1 publication Critical patent/WO2003044890A1/fr

Links

Classifications

    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • 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
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • 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
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • This invention relates to an antenna for a portable radio device, such as a portable radio receiver.
  • the known dipole antenna which utilizes the left and right wires of a pair of headphones adopts a symmetric approach. But this leads to certain drawbacks.
  • the radio is carried at or close to the waistline, the signal quality may be degraded over the length of connecting cable between the dipole centre and the radio.
  • a first element comprises a flexible wire conductor and a second element comprises an electrically conductive casing or electromagnetic shield of the device.
  • the elements can be thought of as a dipole; this dipole is typically asymmetric, with the sum of the effective lengths of the elements (or poles) being approximately a half wavelength but the effective lengths of each element being different. Conversely, the dipole may be roughly symmetric with the sum of the effective lengths of the elements being approximately a half wavelength.
  • the electrically conductive casing or electromagnetic shield of the device may in fact operate as a ground plane, with the flexible wire conductor operating as a monopole.
  • the term 'flexible' requires that the flexible wire conductor can be easily bent, twisted or otherwise deformed and does not then regain its former shape, unlike whip or semi-rigid antennas. This is important since the flexible wire conductor typically has to hang down unobtrusively and comfortably.
  • the flexible wire conductor itself may typically be a 'tuned' lead; it is tuned by being manufactured to a pre-defined length in order to match the incoming signal and the received input. It will typically form part of a lead to a headphone for the device and/or a microphone for the device- i.e. the leads are dual purpose, being both part of the antenna and also carrying data, such as analogue signals driving headphones. More generally, the wires that accompany the antenna wire may be for any kind of data connection and may be electric or optical.
  • standard cable shielding inside which the audio cables lie is the flexible wire conductor. This gives maximum exposure to that element.
  • antenna leads which are separate from the headphone leads, and are in separate channels of the same insulating sheath (or even in separate insulating sheaths).
  • the tuned lead can be terminated in a connector, to which the user may attach headphones and where appropriate a microphone of the user's choice.
  • This connector may contain controls and/or a display for the radio transmitter receiver, including but not necessarily limited to volume controls.
  • Multiple antenna wires of varying lengths corresponding to different operating bands for the radio device may be embedded in a flexible plastic casing forming the flexible wire conductor and may, via a connector, be switchably connected to the conductive casing or shields of the device, allowing the combination to form various poles of different lengths.
  • the antenna may be used for any portable radio receiver and/or transmitter device which requires an antenna length of a half multiple of the wavelength transmitted or received, including but not limited to RF wavelengths between 3 cm and 3 meters for transmission and/or reception via FM, Band III, L Band and Eureka 147, any type of broadcast, analogue or digital, including audio, video, compressed audio and compressed video, data, weather news, travel information, share price information and other similar broadcast text or media services either unconditionally or via a conditional access service.
  • a portable radio device comprising an antenna as defined in the first aspect of the invention.
  • Figure 1 is a drawing of an antenna in accordance with the present invention in which 1/16 of the dipole antenna is provided by the receiver metal housing and 7/16 is provided by a headphone lead.
  • the overall length of the dipole is a half wavelength.
  • the headphone lead would have to be manufactured to a specific length so as to tune it to the radio band the user wishes to receive.
  • Figure 2 is a variation of the Figure 1 antenna in which the tuned headphone lead, terminates in a headphone 'jack'.
  • any headphones including mono or stereo headphones
  • the tuned lead length will be selected to provide maximum gain in the appropriate band for the receiver and maximum match for the receiver input.
  • Figure 3 is a variation of the Figure 2 antenna showing the addition of a remote control unit between the tuned lead and the headphone jack.
  • This remote control unit may either form part of the tuned lead or be connected via an appropriate connector.
  • the invention is described by reference to a digital audio broadcasting (DAB) radio receiver now under development by PSION Digital Limited of the United Kingdom. However, it should be noted that the invention may be applied to a wide range of radio receivers including receivers operating in the FM radio band and to compact radio transmitters.
  • DAB digital audio broadcasting
  • the first version of the invention is illustrated in Figure 1.
  • the metal cased radio 1 and the headphone antenna 2 are arranged in such a way as to comprise an asymmetric electric dipole antenna.
  • the lower dipole element of the antenna is formed by the radio receiver metal case 1 or internal shields and the upper dipole element is provided by the cable shielding in the tuned lead 2 which connects in turn to the headphones 3.
  • a key and unique feature of this configuration is that the feed point 4 from the dipole is extremely close to the radio receiver RF input, thus ensuring good efficiency for the antenna.
  • This variation of the invention may require appropriate tuning components to maximise performance with one particular design of headphones.
  • a tuned lead 2 incorporating a flexible wire element of an antenna dipole (the cable shielding, as in Figure 1) and audio leads to drive headphones 3, is introduced between the receiver 1 and the headphones 3.
  • the tuned lead 2 terminates in a connector jack 4 into which a headphone plug can be inserted.
  • the second element of the dipole antenna is again formed by the radio receiver metal case 1 or internal electromagnetic shields.
  • the complete headphone 3 and headphone lead 5 do not constitute part of the antenna and therefore the radio characteristics of the headphones 3 and length of the headphone lead 5 has no effect on the efficiency of the antenna. Rather the radio characteristics of the antenna are dictated by the tuned lead 2 which extends up to the connector jack 4.
  • Differently optimised tuned leads can be introduced to cover different bands or offset bands to cater for the differing standards of radio transmissions from one region to another. This design allows the user to use their preferred headphones with the device without adversely affecting the reception performance of the antenna.
  • FIG 3 shows another variant in which the tuned lead 2 terminates in a wearable remote control 6 which provides a means of connection and a means of remotely controlling the radio receiver 1 in the one package.
  • the remote control 6 may be connected to the tuned lead 2 by means of a connector but forms part of the upper dipole element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)

Abstract

La présente invention concerne une antenne destinée à un dispositif portatif, dans laquelle un premier élément comprend un conducteur (2) à fil souple et un autre élément comprend un boîtier conduisant l'électricité ou un blindage électromagnétique du dispositif (1). Les éléments sont en général des éléments d'un doublet, ledit doublet étant asymétrique, c'est-à-dire que la somme des longueurs véritables des éléments (1, 2) est voisine d'une demi-longueur d'onde alors que les longueurs véritables de chaque pôle sont différentes.
PCT/GB2002/005211 2001-11-19 2002-11-19 Antenne doublet destinee a un dispositif de radio portatif WO2003044890A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002343041A AU2002343041A1 (en) 2001-11-19 2002-11-19 Dipole antenna for a portable radio device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0127566A GB0127566D0 (en) 2001-11-19 2001-11-19 Antenna for a portable radio device
GB0127566.8 2001-11-19

Publications (1)

Publication Number Publication Date
WO2003044890A1 true WO2003044890A1 (fr) 2003-05-30

Family

ID=9925930

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/005211 WO2003044890A1 (fr) 2001-11-19 2002-11-19 Antenne doublet destinee a un dispositif de radio portatif

Country Status (3)

Country Link
AU (1) AU2002343041A1 (fr)
GB (2) GB0127566D0 (fr)
WO (1) WO2003044890A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1328822C (zh) * 2003-10-29 2007-07-25 日本电气株式会社 天线器件

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1636875A1 (fr) * 2003-06-06 2006-03-22 Koninklijke Philips Electronics N.V. Antenne de radiofrequences dans un dispositif sans fil
JP4026648B2 (ja) * 2004-04-19 2007-12-26 ソニー株式会社 イヤホンアンテナ及びこのイヤホンアンテナを備えた携帯型無線機
JP3933148B2 (ja) * 2004-06-04 2007-06-20 ソニー株式会社 イヤホンアンテナ及びこのイヤホンアンテナを備えた携帯型無線機
WO2008029321A1 (fr) * 2006-09-06 2008-03-13 Koninklijke Philips Electronics N. V. Antennes pour dispositifs blindés
GB2460845A (en) * 2008-06-10 2009-12-16 Future Waves Uk Ltd Combined USB keyboard and digital multimedia receiver device
CN102904991A (zh) * 2012-10-10 2013-01-30 北京小米科技有限责任公司 一种挂件以及终端

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321233A1 (de) * 1992-11-03 1994-05-05 Siemens Ag lambda/2-Antenne
US5440317A (en) * 1993-05-17 1995-08-08 At&T Corp. Antenna assembly for a portable transceiver
US5794163A (en) * 1993-07-27 1998-08-11 Spectralink Corporation Headset for hands-free wireless telephone
US5798736A (en) * 1995-03-28 1998-08-25 Mcdonnell Douglas Corporation Antenna system having a plurality of fundamental resonances
DE19726570C1 (de) * 1997-06-23 1998-12-24 Retronika Ges Fuer Telekommuni Dipolantenne für Funktelefone
US5999132A (en) * 1996-10-02 1999-12-07 Northern Telecom Limited Multi-resonant antenna
US6373437B1 (en) * 2000-12-07 2002-04-16 Motorola, Inc. Communication device having linked microphone and antenna communication of content to end users

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390049A1 (en) * 1977-05-04 1978-12-01 Phelizon Herve Transmitting microphone with integrated antenna - has two part metallic casing separated by insulating material to form antenna
JPS5714505U (fr) * 1980-06-26 1982-01-25
FR2621178B1 (fr) * 1987-09-25 1989-12-01 Alcatel Thomson Radiotelephone Antenne bracelet pour recepteur radioelectrique integre dans une montre
US5361405A (en) * 1989-09-14 1994-11-01 Ramsey Electronics, Inc. Aircraft band radio receiver which does not radiate interfering signals
JP3123363B2 (ja) * 1994-10-04 2001-01-09 三菱電機株式会社 携帯無線機
EP0977366A1 (fr) * 1998-07-10 2000-02-02 Taigulf Company Limited Appareil de communication bidirectionnel pour cyclistes
JP2001244717A (ja) * 2000-03-02 2001-09-07 Matsushita Electric Ind Co Ltd 無線情報家電装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321233A1 (de) * 1992-11-03 1994-05-05 Siemens Ag lambda/2-Antenne
US5440317A (en) * 1993-05-17 1995-08-08 At&T Corp. Antenna assembly for a portable transceiver
US5794163A (en) * 1993-07-27 1998-08-11 Spectralink Corporation Headset for hands-free wireless telephone
US5798736A (en) * 1995-03-28 1998-08-25 Mcdonnell Douglas Corporation Antenna system having a plurality of fundamental resonances
US5999132A (en) * 1996-10-02 1999-12-07 Northern Telecom Limited Multi-resonant antenna
DE19726570C1 (de) * 1997-06-23 1998-12-24 Retronika Ges Fuer Telekommuni Dipolantenne für Funktelefone
US6373437B1 (en) * 2000-12-07 2002-04-16 Motorola, Inc. Communication device having linked microphone and antenna communication of content to end users

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1328822C (zh) * 2003-10-29 2007-07-25 日本电气株式会社 天线器件

Also Published As

Publication number Publication date
GB2382722A (en) 2003-06-04
GB2382722B (en) 2004-06-02
AU2002343041A1 (en) 2003-06-10
GB0127566D0 (en) 2002-01-09
GB0226894D0 (en) 2002-12-24

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