EP0308935A1 - Armbandantenne für Radioempfänger, der in eine Uhr eingebaut ist - Google Patents

Armbandantenne für Radioempfänger, der in eine Uhr eingebaut ist Download PDF

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Publication number
EP0308935A1
EP0308935A1 EP88115606A EP88115606A EP0308935A1 EP 0308935 A1 EP0308935 A1 EP 0308935A1 EP 88115606 A EP88115606 A EP 88115606A EP 88115606 A EP88115606 A EP 88115606A EP 0308935 A1 EP0308935 A1 EP 0308935A1
Authority
EP
European Patent Office
Prior art keywords
bracelet
conductor
receiver
antenna according
antenna
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
EP88115606A
Other languages
English (en)
French (fr)
Other versions
EP0308935B1 (de
Inventor
José Baro
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.)
Alcatel CIT SA
Original Assignee
Alcatel Radiotelephone SA
Alcatel Thomson RadioTelephone
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 Alcatel Radiotelephone SA, Alcatel Thomson RadioTelephone filed Critical Alcatel Radiotelephone SA
Publication of EP0308935A1 publication Critical patent/EP0308935A1/de
Application granted granted Critical
Publication of EP0308935B1 publication Critical patent/EP0308935B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G21/00—Input or output devices integrated in time-pieces
    • G04G21/04—Input or output devices integrated in time-pieces using radio waves
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R60/00—Constructional details
    • G04R60/04—Antennas attached to or integrated in watch bracelets
    • 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

Definitions

  • the present invention relates to a wristband antenna for radio receiver integrated in a watch.
  • Such a receiver is intended for example for the reception of a frequency band of several megahertz defined in the VHF and UHF ranges (that is to say from 80 MHz to 500 MHz or more)
  • the wavelength ⁇ is too long for the antenna that can be integrated into a watch strap to have a correct size related to it; that is to say of the order of ⁇ / 2.
  • the arm of the bracelet wearer and the proximity of his body absorb waves, dampen the antenna, thus disrupting adaptation and radiation.
  • the real behavior of the arm is difficult to quantify and can be different depending on the morphology of the individual, his metabolism and the way of wearing his watch loose or tight.
  • the antenna is optimized, in terms of its effectiveness, to be worn, it must remain operational when the watch strap is removed to be placed on a table, for example.
  • the antenna design must therefore take account of these two operating modes. Another problem, linked to the necessary miniaturization, is to avoid the antenna adaptation circuits comprising inductors which are bulky and cause losses on the signal.
  • the antenna of the present invention includes in its structure the inductance necessary for its own agreement.
  • the invention therefore proposes a wristband antenna for a radio receiver integrated in a watch formed from a box containing said receiver and a strap, the bottom of the box comprising a first metal part which forms the mass of the receiver, characterized in that it includes at least a first conductor metallic disposed inside the bracelet near the external surface of the bracelet on the top side of the watch case, connected to the input of said receiver, and having the shape of a sinuating wire between the two side walls of the bracelet, the unfolded length of this conductor being close to ⁇ / 4, ⁇ being the wavelength corresponding to the central frequency of the signal to be received.
  • Such a wristband antenna makes it possible to obtain a large bandwidth on reception, a great simplicity of embodiment in particular requiring no adaptation circuit for a receiver of input impedance close to 50 ⁇ .
  • the invention provides a wristband antenna which comprises a second metallic conductor connected to the ground of the receiver and located near the internal surface of the wristband on the side of the case back of the watch, the two conductors therefore being arranged close to the two. opposite surfaces of the bracelet.
  • the second metallic conductor like the first conductor, in the form of a sinuating wire between the two side walls of the bracelet, the unfolded length of this conductor being ⁇ / 4, ⁇ being the corresponding wavelength at the center frequency to be received.
  • Figures 1 and 2 show a watch 10 consisting of a housing 11 and a bracelet, for example formed of two parts 12 and 13.
  • a receiver 14 is disposed in the housing 11.
  • the inventive bracelet antenna comprises at least a first metallic conductor 16 disposed near the external surface 17 of the strap 12, on the top side 18 of the case 11.
  • This first conductor 16 is connected to the input of the receiver 14. It has the shape of a sinuous wire between the two side walls 20 and 21 of the strap 12. We will speak later of a "zig-zag" structure. This wire has an extended length of the order of ⁇ / 4; ⁇ being the wavelength corresponding to the center frequency of the signal to be received.
  • the bracelet antenna may also include a second conductor 22 connected to the ground of the receiver 14.
  • This second conductor 22 may have the form of a film placed close to the internal surface 19 of the bracelet situated on the bottom side 23 of the housing 11 .
  • each of the two conductors 16 and 22 is disposed respectively inside one of the two parts 12 and 13 of the bracelet.
  • Figures 1 and 2 of the invention are only schematic figures. Thus, for greater clarity, the proximity of the first and second conductors respectively to the external face and the internal face of the bracelet, which does not appear clearly, given the thin thickness of the bracelet, in these two figures 1 and 2, is highlighted in Figures 3A and 3B.
  • This bracelet antenna behaves like a two-strand antenna, or like a dipole integrated into the bracelet, of equivalent electrical length equal to ⁇ / 2.
  • the unworn watch therefore reacts like a dipole.
  • the bottom of the case, or the second strand 13 of the bracelet ensures the earthing of the receiver.
  • the other strand 12 the dipole of which is raised a little less than the thickness of the bracelet, produces a capacitor capturing the radial field around the arm.
  • the dipole is produced, at least in part, by the "zig-zag" structure allowing integration of the tuning choke of the antenna in the strand itself.
  • the second conductor 22 can also have a "zig-zag" structure as represented by the first connector. In this case, it also has an extended length of ⁇ / 4.
  • the realization of a conductor in "zig-zag” is done by embedded wire or ribbon of a shape ensuring the bending, or by a printed circuit on flexible film sliding freely in a groove of the bracelet.
  • the antenna can also be produced with conductors embedded in the molding, their shape ensuring the flexibility of the bracelet.
  • the second conductor 22 connected to the bottom of the metal case is intended to provide, in addition to the case, the taking of the potential of the arm.
  • the bottom 23 of the receiver watch case in fact, provides a galvanic or capacitive connection with the wearer by means of a large conductive surface covered or not by a thin insulating coating.
  • the first conductor 16 performs a complex function according to the degree of tightening of the bracelet and the degree of sweating of the wearer.
  • the conductor 22 closest to the skin ensures the reference to the potential of the wrist (a kind of earth).
  • the conductor 16 away from the skin by the thickness of the bracelet produces a capacitive antenna (effective height approximately equal to the thickness of the bracelet) ensuring the capture of the radial field around the wrist. This is the desired effect, because the field around a cylindrical conductor can only be radial.
  • the inductance made on the bracelet then compensates for the capacitive term.
  • a variant of the invention which increases its efficiency, consists in using, as shown in FIG. 4, the upper part 24 of the housing 11, in the form for example of a metal crown isolated from the bottom of the housing, to increase the average effective height of the wristband antenna.
  • the efficiency of the antenna in radial behavior is increased with a sufficient length of the two conductors 16 and 22, as shown in FIG. 5, by the doubling of thickness 27 when the bracelet is buckled and the normal projection 25 made by the end of a part 12 of the bracelet after passing through the loop 26.
  • a bracelet antenna produced on Kapton film according to the invention makes it possible to obtain an optimum gain located at - 15dB compared to the ⁇ / 2 dipole for the bracelet worn on the wrist.
  • This gain is, of course, a function of the direction of measurement and of the multiple attitudes that the wearer of the bracet can adopt.
  • the deployed and unworn bracelet gives a gain of -15dB also with ommidirectional radiation relative to the electrical axis of the antenna.
  • the bracelet 12, 13 can be produced in a single piece, this can for example be an elastic bracelet.
  • interconnection devices of the bracelet to the case, known to those skilled in the art, have not been described: this may be, for example, electrical contacts produced by means of bars, flexible connections by film soldered or crimped.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Aerials (AREA)
  • Electric Clocks (AREA)
  • Support Of Aerials (AREA)
  • Structure Of Receivers (AREA)
EP88115606A 1987-09-25 1988-09-22 Armbandantenne für Radioempfänger, der in eine Uhr eingebaut ist Expired - Lifetime EP0308935B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8713265 1987-09-25
FR8713265A FR2621178B1 (fr) 1987-09-25 1987-09-25 Antenne bracelet pour recepteur radioelectrique integre dans une montre

Publications (2)

Publication Number Publication Date
EP0308935A1 true EP0308935A1 (de) 1989-03-29
EP0308935B1 EP0308935B1 (de) 1992-02-19

Family

ID=9355217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115606A Expired - Lifetime EP0308935B1 (de) 1987-09-25 1988-09-22 Armbandantenne für Radioempfänger, der in eine Uhr eingebaut ist

Country Status (4)

Country Link
EP (1) EP0308935B1 (de)
DE (1) DE3868469D1 (de)
ES (1) ES2029508T3 (de)
FR (1) FR2621178B1 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990014721A1 (en) * 1989-05-15 1990-11-29 Telesia S.P.A. Portable personal reception and display device for information transmitted via radio, combined with a watch
EP0443491A1 (de) * 1990-02-20 1991-08-28 Nippon Telegraph And Telephone Corporation Als Armbanduhr zu tragender Empfänger
US5168281A (en) * 1990-05-16 1992-12-01 Seiko Epson Corporation Antenna connection device for electronic equipment
US5243356A (en) * 1988-08-05 1993-09-07 Seiko Epson Corporation Antenna circuit and wrist radio instrument
GB2382722A (en) * 2001-11-19 2003-06-04 Psion Digital Ltd Portable radio device with antenna contained in headphone lead
US7151496B2 (en) 2003-09-03 2006-12-19 Asulab S.A. Patch antenna integrated in a wristwatch
GB2494922A (en) * 2011-09-26 2013-03-27 Antenova Ltd External and flexible groundplane extensions for antennas
WO2014107158A1 (en) * 2013-01-04 2014-07-10 Evado Filip Holding Ltd. Band with an antenna for use with a wireless electronic device
KR20150055989A (ko) * 2013-11-14 2015-05-22 삼성전기주식회사 휴대 단말기와 무선 충전 장치 및 무선 충전 구조
CN105428781A (zh) * 2014-09-15 2016-03-23 三星电子株式会社 电子装置
CN106558758A (zh) * 2016-11-28 2017-04-05 深圳众思科技有限公司 可穿戴设备
CN107710631A (zh) * 2015-06-27 2018-02-16 英特尔公司 可穿戴天线系统
WO2022068801A1 (zh) * 2020-09-29 2022-04-07 维沃移动通信有限公司 穿戴电子设备、天线控制方法和存储介质
WO2022068799A1 (zh) * 2020-09-29 2022-04-07 维沃移动通信有限公司 穿戴式电子设备、天线控制方法和存储介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1019717B (de) * 1956-01-03 1957-11-21 Anton Kathrein Fabrik Elektrot Verkuerzter Dipol
US3032651A (en) * 1957-07-02 1962-05-01 Gisiger-Stahli Josef Wrist carried radio set
EP0125930A2 (de) * 1983-05-17 1984-11-21 Sinclair Research Limited Band

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH073923B2 (ja) * 1985-02-06 1995-01-18 公人 堀江 バンド型アンテナ装置
US4754285A (en) * 1987-05-01 1988-06-28 Timex Corporation Expansion band antenna for a wristwatch application

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1019717B (de) * 1956-01-03 1957-11-21 Anton Kathrein Fabrik Elektrot Verkuerzter Dipol
US3032651A (en) * 1957-07-02 1962-05-01 Gisiger-Stahli Josef Wrist carried radio set
EP0125930A2 (de) * 1983-05-17 1984-11-21 Sinclair Research Limited Band

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 4 (E-468)[2451], 7 janvier 1987; & JP-A-61 181 203 (KIMITO HORIE) 13-08-1986 *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5243356A (en) * 1988-08-05 1993-09-07 Seiko Epson Corporation Antenna circuit and wrist radio instrument
WO1990014721A1 (en) * 1989-05-15 1990-11-29 Telesia S.P.A. Portable personal reception and display device for information transmitted via radio, combined with a watch
EP0443491A1 (de) * 1990-02-20 1991-08-28 Nippon Telegraph And Telephone Corporation Als Armbanduhr zu tragender Empfänger
US5136303A (en) * 1990-02-20 1992-08-04 Nippon Telegraph And Telephone Corporation Wrist watch type receiver
US5168281A (en) * 1990-05-16 1992-12-01 Seiko Epson Corporation Antenna connection device for electronic equipment
GB2382722A (en) * 2001-11-19 2003-06-04 Psion Digital Ltd Portable radio device with antenna contained in headphone lead
GB2382722B (en) * 2001-11-19 2004-06-02 Psion Digital Ltd Antenna for a portable radio device
US7151496B2 (en) 2003-09-03 2006-12-19 Asulab S.A. Patch antenna integrated in a wristwatch
GB2494922A (en) * 2011-09-26 2013-03-27 Antenova Ltd External and flexible groundplane extensions for antennas
WO2014107158A1 (en) * 2013-01-04 2014-07-10 Evado Filip Holding Ltd. Band with an antenna for use with a wireless electronic device
KR20150055989A (ko) * 2013-11-14 2015-05-22 삼성전기주식회사 휴대 단말기와 무선 충전 장치 및 무선 충전 구조
CN105428781A (zh) * 2014-09-15 2016-03-23 三星电子株式会社 电子装置
EP3001500A3 (de) * 2014-09-15 2016-04-06 Samsung Electronics Co., Ltd. Elektronische vorrichtung
US9786982B2 (en) 2014-09-15 2017-10-10 Samsung Electronics Co., Ltd. Electronic device
CN107710631A (zh) * 2015-06-27 2018-02-16 英特尔公司 可穿戴天线系统
EP3314770A4 (de) * 2015-06-27 2019-02-20 INTEL Corporation Wearable-antennensystem
CN107710631B (zh) * 2015-06-27 2021-03-12 英特尔公司 可穿戴天线系统
CN106558758A (zh) * 2016-11-28 2017-04-05 深圳众思科技有限公司 可穿戴设备
CN106558758B (zh) * 2016-11-28 2024-06-11 南昌黑鲨科技有限公司 可穿戴设备
WO2022068801A1 (zh) * 2020-09-29 2022-04-07 维沃移动通信有限公司 穿戴电子设备、天线控制方法和存储介质
WO2022068799A1 (zh) * 2020-09-29 2022-04-07 维沃移动通信有限公司 穿戴式电子设备、天线控制方法和存储介质

Also Published As

Publication number Publication date
EP0308935B1 (de) 1992-02-19
FR2621178A1 (fr) 1989-03-31
ES2029508T3 (es) 1992-08-16
DE3868469D1 (de) 1992-03-26
FR2621178B1 (fr) 1989-12-01

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