EP0308935B1 - 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
EP0308935B1
EP0308935B1 EP88115606A EP88115606A EP0308935B1 EP 0308935 B1 EP0308935 B1 EP 0308935B1 EP 88115606 A EP88115606 A EP 88115606A EP 88115606 A EP88115606 A EP 88115606A EP 0308935 B1 EP0308935 B1 EP 0308935B1
Authority
EP
European Patent Office
Prior art keywords
watchstrap
antenna
bracelet
watchcase
antenna according
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.)
Expired - Lifetime
Application number
EP88115606A
Other languages
English (en)
French (fr)
Other versions
EP0308935A1 (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
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 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.
  • 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 proposes a wristband antenna for radio receiver integrated in a watch, said watch being formed of a case and a bracelet, this case containing said receiver and a first metal part forming the mass of the receiver and which is located near the bottom of said case, said antenna being a two-strand dipole antenna arranged inside the bracelet;
  • the first strand connected to the input of said receiver, being formed of a first metallic conductor disposed inside the strap near the external surface of the strap on the top side of the watch case, and having the shape of a wire, winding between the two side walls of the bracelet, of unfolded length close to ⁇ / 4, ⁇ being the wavelength corresponding to the central frequency of the signal to be received;
  • the second strand being formed of a second metallic conductor disposed inside the bracelet close to the internal surface of the bracelet on the bottom side of the watch case, and connected to the first metal part.
  • 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 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 "zigzag" 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 "zigzag" 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 depending on the degree of tightening of the bracelet and the degree of sweating of the wearer.
  • 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, it 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)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Electric Clocks (AREA)
  • Structure Of Receivers (AREA)

Claims (9)

  1. Armbandantenne für einen in eine Uhr (10) eingebauten Radioempfänger, wobei die Uhr (10) aus einem Gehäuse (11) und einem Armband (12, 13) besteht und das Gehäuse (12) den Empfänger (14) und ein erstes Metallteil (15) als Masse des Empfängers in der Nähe des Bodens (23) des Gehäuses (11) enthält, wobei die Antenne eine aus zwei Leitern bestehende, im Inneren des Armbands untergebrachte Dipolantenne ist, wobei der erste, mit dem Eingang des Empfängers (14) verbundene Leiter aus einem ersten metallischen Leiter (16) besteht, der im Inneren des Armbands (12, 13) in der Nähe der äußeren Oberfläche (17) des Armbands (12, 13) an der Oberseite (18) des Gehäuses (11) der Uhr (10) angeordnet ist und die Form eines schlangenförmig zwischen den beiden Seitenwänden (20, 21) des Armbands (12, 13) verlaufenden Drahts mit einer gestreckten Länge in der Nähe von λ/4 besitzt, wobei λ die der Mittenfrequenz des zu empfangenden Signals entsprechende Wellenlänge ist, während der zweite Leiter aus einem zweiten metallischen Leiter (22) besteht, der im Inneren des Armbands in der Nähe der inneren Oberfläche des Armbands (12, 13) an der Bodenseite des Gehäuses (11) der Uhr (10) angeordnet und mit dem ersten Metallteil (15) verbunden ist.
  2. Armbandantenne nach Anspruch 1, dadurch gekennzeichnet, daß der zweite metallische Leiter (22) die Form eines Films besitzt.
  3. Armbandantenne nach Anspruch 1, dadurch gekennzeichnet, daß der zweite metallische Leiter (22) die Form eines schlangenförmig zwischen den beiden Seitenwänden (20, 21) des Armbands (12, 13) verlaufenden Drahts besitzt, wobei die gestreckte Länge dieses zweiten metallischen Leiters (16) in der Nähe von λ/4 liegt und λ die der Mittenfrequenz des zu empfangenden Signals entsprechende Wellenlänge ist.
  4. Armbandantenne nach Anspruch 3, dadurch gekennzeichnet, daß das Armband (12, 13) zwei Teile (12, 13) aufweist und die beiden Leiter (16, 22) jeweils im Inneren eines der beiden Teile (12, 13) angeordnet sind.
  5. Armbandantenne nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Boden (23) des Gehäuses (11) der Empfängeruhr (10) eine galvanische oder kapazitive Verbindung mit dem Träger der Uhr aufgrund einer großen leitenden Oberfläche bewirkt, die ggfs. mit einem Isolierüberzug geringer Dicke bedeckt ist.
  6. Armbandantenne nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie aus einer gedruckten Schaltung auf einem elastischen Film besteht.
  7. Armbandantenne nach einem beliebigen der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß sie unter Verwendung eines beim Gießen eingebetteten Leiters hergestellt ist und eine die Elastizität des Armbands gewährleistende Form besitzt.
  8. Armbandantenne nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der erste metallische Leiter (16) mit einem zweiten Metallteil (24) verbunden ist, das im oberen Abschnitt des Gehäuses (11) angeordnet und gegen das erste Metallteil (15) am Boden (23) des Gehäuses (11) isoliert ist.
  9. Armbandantenne nach Anspruch 8, dadurch gekennzeichnet, daß das zweite Metallteil (24) die Form einer Kurve besitzt.
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
FR8713265A FR2621178B1 (fr) 1987-09-25 1987-09-25 Antenne bracelet pour recepteur radioelectrique integre dans une montre
FR8713265 1987-09-25

Publications (2)

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

Families Citing this family (14)

* 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
IT1231784B (it) * 1989-05-15 1992-01-14 Telesia Spa Dispositivo portatile personale di ricezione e presentazione di informazioni trasmesse via radio, integrato con orologio
JP3055703B2 (ja) * 1990-02-20 2000-06-26 日本電信電話株式会社 腕時計形受信機
JP2985296B2 (ja) * 1990-05-16 1999-11-29 セイコーエプソン株式会社 電子機器のアンテナ接続装置
GB0127566D0 (en) * 2001-11-19 2002-01-09 Psion Digital Ltd Antenna for a portable radio device
EP1513220B1 (de) 2003-09-03 2018-10-31 The Swatch Group Research and Development Ltd Patch-Antenne integriert in einer Armbanduhr
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
KR102025889B1 (ko) * 2013-11-14 2019-09-26 주식회사 위츠 휴대 단말기와 무선 충전 장치 및 무선 충전 구조
KR102300862B1 (ko) * 2014-09-15 2021-09-13 삼성전자주식회사 전자 장치
US9653786B2 (en) * 2015-06-27 2017-05-16 Intel Corporation Wearable antenna system
CN106558758B (zh) * 2016-11-28 2024-06-11 南昌黑鲨科技有限公司 可穿戴设备
CN112165545A (zh) * 2020-09-29 2021-01-01 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
CN112216957B (zh) * 2020-09-29 2023-12-01 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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288676A2 (de) * 1987-05-01 1988-11-02 Timex Corporation Elastisches Antennenband zur Anwendung in Armbanduhren

Family Cites Families (4)

* 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
GB8313658D0 (en) * 1983-05-17 1983-06-22 Sinclair Res Ltd Strap assembly
JPH073923B2 (ja) * 1985-02-06 1995-01-18 公人 堀江 バンド型アンテナ装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288676A2 (de) * 1987-05-01 1988-11-02 Timex Corporation Elastisches Antennenband zur Anwendung in Armbanduhren

Also Published As

Publication number Publication date
ES2029508T3 (es) 1992-08-16
EP0308935A1 (de) 1989-03-29
DE3868469D1 (de) 1992-03-26
FR2621178B1 (fr) 1989-12-01
FR2621178A1 (fr) 1989-03-31

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