EP0312792A1 - Antenne für Miniatur-Radioempfänger im Uhrengehäuse - Google Patents

Antenne für Miniatur-Radioempfänger im Uhrengehäuse Download PDF

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Publication number
EP0312792A1
EP0312792A1 EP88115605A EP88115605A EP0312792A1 EP 0312792 A1 EP0312792 A1 EP 0312792A1 EP 88115605 A EP88115605 A EP 88115605A EP 88115605 A EP88115605 A EP 88115605A EP 0312792 A1 EP0312792 A1 EP 0312792A1
Authority
EP
European Patent Office
Prior art keywords
antenna
receiver
conductive element
housing
watch
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
EP88115605A
Other languages
English (en)
French (fr)
Other versions
EP0312792B1 (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 EP0312792A1 publication Critical patent/EP0312792A1/de
Application granted granted Critical
Publication of EP0312792B1 publication Critical patent/EP0312792B1/de
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
    • H01Q1/27—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 an antenna for a miniature receiver, in particular for a receiver in the form of a watch case.
  • the present invention consists of an antenna intended for a radio receiver, for example integrated in a watch case.
  • the invention can also be applied to a low power transmitter having the same shape.
  • the invention is intended to operate in a fixed frequency band chosen from the VHF or UHF ranges (from 80 MHz to 500 MHz for example).
  • a receiver worn on the wrist must remain effective for a maximum of attitudes of the wearer while favoring if possible the most probable. It should also be noted that the performance of the antenna produced must not be impaired either by the presence of the electronics, the battery, the movement of the watch (if the watch keeps its original function), or by the nature of the materials that make up the case.
  • the object of the invention is to solve these problems by proposing an antenna whose radiation pattern is as close as possible to that of an isotropic antenna.
  • the invention proposes for this purpose an antenna for a receiver miniature, in particular for a receiver in the form of a watch case, said receiver box comprising a receiver proper, different control and supply parts, said antenna being characterized in that it comprises: - a first conductive element, located in the upper part of the housing and isolated from the rest of the housing, which comprises a split annular loop constituting mainly a magnetic antenna; - a second conductive element connected to the ground of the receiver and arranged in the lower part of the housing; - an adaptation and tuning circuit connecting these two conductive elements to the inputs of the receiver.
  • the integration of the antenna in the case of a watch makes it possible to avoid all the problems of interconnection, of maintenance which would exist for example in the case of an antenna integrated in a watch band; the bracelet being a part which deteriorates regularly and which must then be able to be replaced without problem.
  • the invention proposes an antenna in which the first conductive element is included in the upper crown of a watch case.
  • the adaptation circuit consists of a capacitive divider tuning and adapting to the receiver (or to the possible transmitter) the antenna thus produced, these various elements being integrated inside the case of a wristwatch.
  • the present invention makes it possible to produce an integrated antenna of optimum efficiency by using the structure of the watch case, by combining two reception modes by magnetic loop and by capacitive doublet, and also providing - maximum radiation resistance for the volume allocated; - multi-polarization reception; - the removal of any inductive element of adaptation.
  • the antenna of the invention comprises: a first conductive element 10 formed of a split annular loop, a second conductive element 11, a circuit 12 for adaptation and tuning.
  • the first conductive element 10 forms an inductance here of a single turn. It is arranged in the upper part of a watch case 13 which includes a strap 14. This element 10 can be the upper crown of a metal watch, but it must then be isolated from the rest of the case 13. It can also be a conductive wire or ribbon embedded in a molded case of insulating material. This first element 10 makes it possible to form a loop sensitive to the magnetic component of the electromagnetic field.
  • the second conductive element 11 consists of the rest of the housing if the latter is completely metallic, or, in the case of an insulating material housing, of an added element as shown in FIG. 2.
  • This conductive element 11 makes it possible to realize the compact gathering of the most important conducting masses of the receiver watch including in particular those of the receiver itself, those of the battery (ies) and electronics, and that of the motor if the watch has a needle system. time display. All these different parts for controlling the operation of the receiver watch are shown in FIGS. 1 and 2 in a set 18.
  • the matching and matching circuit 12 connects the two conductive elements 10 and 11 to the inputs of the receiver 17 contained in the watch.
  • the first element 10 is represented by an inductor.
  • the circuit 12 for adaptation and tuning consists of the capacitive divider (15, 16), the element 15 partly comprising the capacity created by the capacitive dipole produced between the upper part and the lower part of the housing :
  • the two capacitors 15 and 16 therefore appear between the two conductive elements 10 and 11 as shown in FIG. 2.
  • This capacitive doublet (15, 16) is sensitive to the fields directed perpendicular to the conductive turn 10.
  • the inductance formed by the first conductive element 10 is sensitive to any radial field with respect to the turn which it forms.
  • the mixed electric and magnetic aspect reduces the sensitivity to the presence of the body of the wearer of the watch and to that of magnetic masses.
  • the two capacities 15 and 16 which, for example, constitute the circuit 12 allow: - to complete the tuning of the resonant circuit and the setting to the operating frequency. Indeed, in the operation of a receiver integrated in a watch, as described above, the overvoltage is very high and the bandwidth narrow; - to transform the pure resistance seen in tuning which is very high into a lower resistance optimized for the receiver (optimization of the signal / noise ratio of the input stage).
  • the invention therefore consists in producing a capacitive antenna formed from the upper ring of the housing, isolated from the rest of said housing, and forming a capacitor with the bottom of the housing and the rest of the conductive components, including the battery, and to use this crown as chord inductor.
  • the second conductive element 11 may also have an inductive structure but more massive than that of the first element 10. We then have for example the equivalent diagram represented in FIG. 6.
  • the radiation provided by the capacitive and inductive aspect is out of phase with in time, so the polarization is elliptical.
  • the magnetic aspect will or will not be preponderant over the electrical aspect. So : - at 450 MHz the coil 10 requires only a slight additional tuning: The magnetic-electric balancing is almost achieved. We then have for example two capacities respectively of a few picofarads and a few tens of picofarads, a coefficient Q of about 300 to - 3dB and a bandwidth of about 1.5 MHz to - 3dB; - at 150 MHz there is essentially a magnetic coil. But the small electrical contribution is welcome to capture in the directions where the loop has a receiving hole. - at 900 MHz (if networks came at this frequency), the relationships between the components should be easily mastered.
  • An antenna according to the invention makes it possible, for example, to obtain in the frequency range 450-470 MHz a bandwidth of 1.5 MHz with an antenna gain in the optimal directions of 13 dB relative to a ⁇ / 2 reference dipole and when the receiving watch is in free space.
  • the gain of this same achievement is around 18dB below that of the dipole when the watch is worn on the wrist.
  • the first conductive element 10 can comprise several turns.
EP88115605A 1987-09-25 1988-09-22 Antenne für Miniatur-Radioempfänger im Uhrengehäuse Expired - Lifetime EP0312792B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8713266A FR2621179B1 (fr) 1987-09-25 1987-09-25 Antenne pour recepteur miniature notamment pour recepteur en forme de boitier de montre
FR8713266 1987-09-25

Publications (2)

Publication Number Publication Date
EP0312792A1 true EP0312792A1 (de) 1989-04-26
EP0312792B1 EP0312792B1 (de) 1993-11-03

Family

ID=9355218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115605A Expired - Lifetime EP0312792B1 (de) 1987-09-25 1988-09-22 Antenne für Miniatur-Radioempfänger im Uhrengehäuse

Country Status (4)

Country Link
EP (1) EP0312792B1 (de)
DE (1) DE3885410T2 (de)
ES (1) ES2046266T3 (de)
FR (1) FR2621179B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4222307A1 (de) * 1992-07-08 1994-01-13 Schickedanz Willi Uhr
EP0603721A1 (de) * 1992-12-23 1994-06-29 Asulab S.A. Uhr mit einer ein elektromagnetisches Signal aussendenden Antenne
EP0777292A1 (de) * 1995-12-06 1997-06-04 Ziegler, Horst Prof. Dr. Antenneneinheit
DE19613491A1 (de) * 1996-04-04 1997-10-16 Diehl Ident Gmbh Transponder-Armbanduhr
EP0805507A1 (de) * 1996-05-03 1997-11-05 Eta SA Fabriques d'Ebauches Empfangs- und/oder Sendeeinrichtung für Funksprüche mit einer induktiven und kapazitiven Antenne
GB2314462B (en) * 1996-06-17 2000-11-08 Nec Corp Loop antenna
EP1538558A2 (de) * 2003-12-03 2005-06-08 Hitachi, Ltd. RFID mit Resonanzkreis
CN104160551A (zh) * 2013-02-08 2014-11-19 佳明瑞士有限责任公司 具有边框天线配置的手表

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6197450B1 (en) * 1998-10-22 2001-03-06 Ramot University Authority For Applied Research & Industrial Development Ltd. Micro electrochemical energy storage cells

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032651A (en) * 1957-07-02 1962-05-01 Gisiger-Stahli Josef Wrist carried radio set
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
DE3111983A1 (de) * 1981-03-26 1982-10-14 Siemens AG, 1000 Berlin und 8000 München Koppelschaltung fuer rahmenantennen
EP0117283A1 (de) * 1983-01-28 1984-09-05 Robert Bosch Gmbh Dipolantenne für tragbare Funkgeräte
US4491970A (en) * 1982-12-30 1985-01-01 Lifeline Systems, Inc. Portable transmitter for emergency alarm system having watertight enclosure
FR2558663A1 (fr) * 1984-01-20 1985-07-26 Vaucelle Alain Dispositif portatif de commande de circuits electriques par emission d'ondes hertziennes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56169401A (en) * 1980-05-31 1981-12-26 Shuichi Sakai Antenna for wrist watch type receiver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032651A (en) * 1957-07-02 1962-05-01 Gisiger-Stahli Josef Wrist carried radio set
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
DE3111983A1 (de) * 1981-03-26 1982-10-14 Siemens AG, 1000 Berlin und 8000 München Koppelschaltung fuer rahmenantennen
US4491970A (en) * 1982-12-30 1985-01-01 Lifeline Systems, Inc. Portable transmitter for emergency alarm system having watertight enclosure
EP0117283A1 (de) * 1983-01-28 1984-09-05 Robert Bosch Gmbh Dipolantenne für tragbare Funkgeräte
FR2558663A1 (fr) * 1984-01-20 1985-07-26 Vaucelle Alain Dispositif portatif de commande de circuits electriques par emission d'ondes hertziennes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4222307A1 (de) * 1992-07-08 1994-01-13 Schickedanz Willi Uhr
EP0603721A1 (de) * 1992-12-23 1994-06-29 Asulab S.A. Uhr mit einer ein elektromagnetisches Signal aussendenden Antenne
US5367502A (en) * 1992-12-23 1994-11-22 Asulab S.A. Timepiece including a broadcasting antenna for an electromagnetic signal
CH686107GA3 (fr) * 1992-12-23 1996-01-15 Asulab Sa Piece d'horlogerie comportant une antenne d'emission d'un signal electromagnetique.
EP0777292A1 (de) * 1995-12-06 1997-06-04 Ziegler, Horst Prof. Dr. Antenneneinheit
DE19613491B4 (de) * 1996-04-04 2005-07-21 Junghans Uhren Gmbh Transponder-Armbanduhr
DE19613491A1 (de) * 1996-04-04 1997-10-16 Diehl Ident Gmbh Transponder-Armbanduhr
EP0805507A1 (de) * 1996-05-03 1997-11-05 Eta SA Fabriques d'Ebauches Empfangs- und/oder Sendeeinrichtung für Funksprüche mit einer induktiven und kapazitiven Antenne
FR2748360A1 (fr) * 1996-05-03 1997-11-07 Ebauchesfabrik Eta Ag Dispositif de reception et/ou d'emission de messages radio-diffuses portatif comportant une antenne inductive et capacitive
US5907522A (en) * 1996-05-03 1999-05-25 Eta Sa Fabriques D'ebauches Portable device for receiving and/or transmitting radio-transmitted messages comprising an inductive capacitive antenna
AU715114B2 (en) * 1996-05-03 2000-01-20 Eta Sa Fabriques D'ebauches Portable device for receiving and/or transmitting radio- transmitted messages comprising an inductive capacitive antenna
GB2314462B (en) * 1996-06-17 2000-11-08 Nec Corp Loop antenna
EP1538558A2 (de) * 2003-12-03 2005-06-08 Hitachi, Ltd. RFID mit Resonanzkreis
EP1538558A3 (de) * 2003-12-03 2006-05-03 Hitachi, Ltd. RFID mit Resonanzkreis
CN104160551A (zh) * 2013-02-08 2014-11-19 佳明瑞士有限责任公司 具有边框天线配置的手表
US9172148B2 (en) 2013-02-08 2015-10-27 Garmin Switzerland Gmbh Watch with bezel antenna configuration
US9257740B2 (en) 2013-02-08 2016-02-09 Garmin Switzerland Gmbh Watch with bezel antenna configuration

Also Published As

Publication number Publication date
DE3885410T2 (de) 1994-03-03
EP0312792B1 (de) 1993-11-03
FR2621179B1 (fr) 1990-01-19
ES2046266T3 (es) 1994-02-01
FR2621179A1 (fr) 1989-03-31
DE3885410D1 (de) 1993-12-09

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