EP1612884A1 - Circuit de connexion entre deux antennes à boucles integrées dans un bracelet d'un instrument sans fils porté au poignet - Google Patents

Circuit de connexion entre deux antennes à boucles integrées dans un bracelet d'un instrument sans fils porté au poignet Download PDF

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Publication number
EP1612884A1
EP1612884A1 EP04103146A EP04103146A EP1612884A1 EP 1612884 A1 EP1612884 A1 EP 1612884A1 EP 04103146 A EP04103146 A EP 04103146A EP 04103146 A EP04103146 A EP 04103146A EP 1612884 A1 EP1612884 A1 EP 1612884A1
Authority
EP
European Patent Office
Prior art keywords
tuning
wireless instrument
capacitor
antenna
loop antennas
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
EP04103146A
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German (de)
English (en)
Other versions
EP1612884B1 (fr
Inventor
Martin Bisig
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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 ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to DE602004017150T priority Critical patent/DE602004017150D1/de
Priority to AT04103146T priority patent/ATE411631T1/de
Priority to EP04103146A priority patent/EP1612884B1/fr
Priority to TW094120028A priority patent/TWI360915B/zh
Priority to KR1020050052707A priority patent/KR101180206B1/ko
Priority to JP2005179031A priority patent/JP4644534B2/ja
Priority to SG200504843A priority patent/SG118435A1/en
Priority to CN2005100797819A priority patent/CN1716691B/zh
Publication of EP1612884A1 publication Critical patent/EP1612884A1/fr
Priority to HK06106895.7A priority patent/HK1086951A1/xx
Application granted granted Critical
Publication of EP1612884B1 publication Critical patent/EP1612884B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01Q1/12—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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • 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
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/005—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with variable reactance for tuning the antenna

Definitions

  • the invention relates to a wrist-carried wireless instrument, and more particularly, to a wristwatch receiver having magnetic loop antennas embedded in the wristband.
  • a loop antenna has to be understood as one single loop conductor lying substantially in the same plane, the frequency of operation of which is normally such as to give a substantially uniform current along the conductor.
  • the loop antenna 101 can be formed in a unitary fashion inside the wristband 102, which is connected to the casing 103 of the wrist-carried wireless instrument 100 to form a continuous loop via a center fastening structure 104, for example a clasp, of the wristband when the band is fastened.
  • the wristband 102 typically contains a wristband adjusting structure to adjust the length of the wristband to the thickness of the wearer's arm. This adjustment causes the antenna's loop length to vary from wearer to wearer, which causes variations in the receivable frequency band from one wearer to another.
  • a solution consisting in providing the wireless instrument 100 with an additional apparatus for compensating changes in antenna gain and resonance frequency resulting from changes in the antenna's loop length is complex and bulky, which is not desirable in such wireless instruments.
  • the wrist-carried wireless instrument 110 includes a casing 113, a center fastening-type wristband 112.
  • the wristband 112 has upper 121 and lower 122 surfaces and a fastening structure 114 at its center and consists of a pair of wristband parts 112a and 112b, each of which is attached to an end of the casing 113.
  • a receiving antenna 111 is mounted inside in at least one part 112a of the wristband to receive signals, the antenna 111 being connected via terminals to a reception circuit inside the casing 113.
  • the loop antenna 111 extends between the upper 121 and lower 122 surfaces of the wristband 112 and does not go through the center fastening structure 114. It is to be noted that reception would be possible without having the wristband 112 attached and forming a loop, as it does when worn.
  • the main object of the present invention is to realize a wrist-carried wireless instrument for receiving radio frequency signals having two loop antennas mounted inside the wristband, these antennas having improved antenna efficiency.
  • reducing impact of the antenna losses can be achieved by connecting both loop antennas in parallel and, on the other hand, increasing the antenna radiation resistance can be achieved by connecting both loop antennas in series.
  • the wireless instrument comprises a wristband having a first and a second band portions connected to opposite edges of a casing, each of said first and second band portions having upper and lower surfaces.
  • a first and a second loop antennas are embedded respectively in said first and second band portions and extend between said corresponding upper and lower surfaces. Both loop antennas are connected through said opposite edges of said casing to a first and a second tuning circuits, wherein said first and second tuning circuits are connected to an antenna receiver arranged in said casing and together in a hybrid manner via an interconnection circuit, both tuning circuits being connected partially in parallel and partially in series.
  • the present invention concerns wrist-carried wireless instrument for receiving radio frequency signals, in the frequency band from 30 to 300 MHz and preferably in the frequency band from 88 to 108 MHz using the radio data transmission system.
  • the invention more particularly relates to an antenna structure having optimised antenna efficiency.
  • Wireless instrument 1 comprises a wristband 2 having a first 2a and a second 2b band portions connected to opposite edges of a casing 3, each band portion having upper and lower surfaces.
  • a first 4a and a second 4b loop antennas are embedded respectively in the first and second band portions 2a and 2b and extend between the corresponding upper and lower surfaces.
  • Both loop antennas 4a and 4b are connected through the opposite edges of casing 3 respectively to a first 5a and second 5b tuning circuits.
  • Both tuning circuits are connected to an antenna receiver 6 arranged in said casing 3. Additionally both tuning circuits are connected together in a hybrid manner via an interconnection circuit 7 which will be more detailed with regards of Figure 2.
  • Figure 2 shows a schematic of the antenna circuits inside the casing of the wireless instrument according to a preferred embodiment of the invention.
  • the numerical references have been kept unchanged for the common elements with Figure 1.
  • Both loop antennas 4a and 4b are connected to antenna receiver 6 via both tuning circuits 5a and 5b. Further, an interconnection circuit 7 is provided for interconnecting both tuning circuits 5a and 5b and then both loop antennas 4a and 4b.
  • a goal of the present invention is to optimise antenna efficiency. To achieve this goal, it is important to reduce the ratio of the antenna losses over the radiation resistance, and therefore to reduce the antenna losses and to increase the radiation resistance. It has been shown in relation with the present invention that reduction of the ohmic and dielectric losses of the antennas can be achieved by connecting both loop antennas 4a et 4b in parallel. With such a parallel connection of both loop antennas, the losses are reduced by approximately 50%, while the radiation resistance is kept on a level of a single loop antenna. It has been also shown in relation with the present invention that increase of the radiation resistance can be achieved by connecting both loop antennas 4a and 4b in series. With such a series connection of both loop antennas, the radiation resistance is increased by a factor four, while the losses are only increased by a factor of about two or a little bit more, then reducing the ratio of antenna losses over radiation resistance by a factor of about two.
  • interconnection circuit 7 is designed for interconnecting both tuning circuits 5a and 5b and then both loop antennas 4a and 4b in a hybrid manner between these two "extreme" connections, i.e. partially in parallel and partially in series.
  • interconnection circuit 7 is a capacitor network comprising a first C P1 and a second C P2 capacitors connecting respectively both tuning circuits 5a and 5b partially in parallel, and a third capacitor C S connecting both tuning circuits 5a and 5b partially in series.
  • each loop antenna is connected to the corresponding tuning circuit, respectively 5a and 5b, at two connecting points, respectively 8a, 9a and 8b, 9b.
  • First capacitor C P1 is connected to connecting point 8a on one side and to connecting point 8b on the other side.
  • Second capacitor C P2 is connected to connecting point 9a on one side and to connecting point 9b on the other side.
  • Both tuning circuits 5a and 5b are then connected partially in parallel via both capacitors C P1 and C P2 .
  • Third capacitor C S is connected to connecting point 8b on one side and to connecting point 9a on the other side. Both circuits are then connected partially in series via third capacitor C S .
  • antenna receiver 6 is connected to connecting points 8a and 9b.
  • both loop antennas are then connected partially in parallel and partially in series, which allow the ratio of antenna losses over radiation resistance to be greatly reduced and antenna efficiency greatly increased.
  • tuning circuit components In order to further increase antenna efficiency, it is important to take care about the tuning circuit components. As a matter of fact, tuning of loop antennas is necessary because of the small bandwidth of this type of antenna. This tuning can be achieved by using varactors.
  • each antenna tuning circuit is designed for introducing minimum conductive losses by connecting varactors in parallel.
  • first tuning circuit 5a includes a capacitor 52a and a varactor 51 a connected in series and a resistor 53a connected between capacitor 52a and varactor 51a on one side and to a determined potential V A on the other side.
  • Resistor 53a supplies varactor 51a with a constant tuning voltage during radio reception, the varactor capacitance being changed with this tuning voltage. Therefore, any particular reception frequency of the antenna requires a different varactor capacitance that is tuned by this tuning voltage.
  • Voltage V A is determined by way of conventional means, for example with a binary search algorithm.
  • Second tuning circuit 5b is of the same type as tuning circuit 5a. It includes a capacitor 52b and a varactor 51 b connected in series and a resistor 53b connected between capacitor 52b and varactor 51 b on one side and to a determined potential V B on the other side. Resistor 53b supplies varactor 51 b with a constant tuning voltage during radio reception, the varactor capacitance being changed with this tuning voltage. Therefore, any particular reception frequency of the antenna requires a different varactor capacitance that is tuned by this tuning voltage. Voltage V B is also determined by way of conventional means, for example with a binary search algorithm.
  • each tuning circuit can include two varactors, instead of one varactor and one capacitor, connected in series but in opposite polarisation in order to optimise the behaviour of these tuning circuits.
  • both varactors 51 a and 51 b are connected in an "anti" parallel way, being then in opposite polarisation. Even with asymmetry of both tuning circuits, it is nevertheless a preferred solution because it introduces fewer losses and requires fewer components than symmetrical tuning circuits that comprise each two varactors in series and in opposite polarisation.
  • tuning circuits 5a and 5b are preferably provided with a capacitor C T for adjusting their tuning range, which is connected between capacitor 52a and varactor 51a of first tuning circuit 5a on the one side, and between varactor 51 b and capacitor 52b of second tuning circuit 5b on the other side.
  • the loop antennas are preferably rectangular or so-called opened O-shaped.
  • both loop antennas have the same shape in order to preserve symmetry.
  • any other loop antenna shape can be used as long as it fits into wristband portions.
  • Both antennas operate preferably in the frequency band from 88 to 108 MHz using the radio data transmission system.
  • the wireless instrument is preferably a wristwatch.

Landscapes

  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Structure Of Receivers (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Electric Clocks (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
EP04103146A 2004-07-02 2004-07-02 Circuit de connexion entre deux antennes à boucles integrées dans un bracelet d'un instrument sans fils porté au poignet Active EP1612884B1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE602004017150T DE602004017150D1 (de) 2004-07-02 2004-07-02 Verbindungschaltung zwischen zwei Schleifenantennen integriert in einem Armband am Handgelenk zu tragendes drahtloses Gerät
AT04103146T ATE411631T1 (de) 2004-07-02 2004-07-02 Verbindungschaltung zwischen zwei schleifenantennen integriert in einem armband am handgelenk zu tragendes drahtloses gerät
EP04103146A EP1612884B1 (fr) 2004-07-02 2004-07-02 Circuit de connexion entre deux antennes à boucles integrées dans un bracelet d'un instrument sans fils porté au poignet
TW094120028A TWI360915B (en) 2004-07-02 2005-06-16 Interconnection circuit between two loop antennas
KR1020050052707A KR101180206B1 (ko) 2004-07-02 2005-06-18 손목-착용형 무선 기기의 손목밴드에 내장된 두 개의 루프안테나 사이의 상호접속회로
JP2005179031A JP4644534B2 (ja) 2004-07-02 2005-06-20 手首に装着する無線機器のリストバンドに埋め込まれた２個のループアンテナ間の相互接続回路
SG200504843A SG118435A1 (en) 2004-07-02 2005-06-27 Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument
CN2005100797819A CN1716691B (zh) 2004-07-02 2005-06-28 嵌入腕携无线装置腕带中的两个环形天线之间的互连电路
HK06106895.7A HK1086951A1 (en) 2004-07-02 2006-06-16 Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04103146A EP1612884B1 (fr) 2004-07-02 2004-07-02 Circuit de connexion entre deux antennes à boucles integrées dans un bracelet d'un instrument sans fils porté au poignet

Publications (2)

Publication Number Publication Date
EP1612884A1 true EP1612884A1 (fr) 2006-01-04
EP1612884B1 EP1612884B1 (fr) 2008-10-15

Family

ID=34929287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04103146A Active EP1612884B1 (fr) 2004-07-02 2004-07-02 Circuit de connexion entre deux antennes à boucles integrées dans un bracelet d'un instrument sans fils porté au poignet

Country Status (9)

Country Link
EP (1) EP1612884B1 (fr)
JP (1) JP4644534B2 (fr)
KR (1) KR101180206B1 (fr)
CN (1) CN1716691B (fr)
AT (1) ATE411631T1 (fr)
DE (1) DE602004017150D1 (fr)
HK (1) HK1086951A1 (fr)
SG (1) SG118435A1 (fr)
TW (1) TWI360915B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017133543A1 (fr) 2016-02-01 2017-08-10 Huawei Technologies Co., Ltd. Antenne nfc pour application portable
US11616289B2 (en) 2018-01-15 2023-03-28 Samsung Electronics Co., Ltd Antenna for detecting position of external electronic device and wearable electronic device including the same

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7242359B2 (en) * 2004-08-18 2007-07-10 Microsoft Corporation Parallel loop antennas for a mobile electronic device
EP2201693A1 (fr) * 2007-10-09 2010-06-30 QUALCOMM Incorporated Appareil comportant un boîtier incorporant un élément rayonnant d'une antenne
KR20130084124A (ko) 2012-01-16 2013-07-24 삼성전자주식회사 통신장치
CN103458640A (zh) * 2013-08-12 2013-12-18 青岛歌尔声学科技有限公司 一种可佩戴电子设备的绑带及一种可佩戴电子设备
JP6345396B2 (ja) * 2013-08-27 2018-06-20 シャープ株式会社 無線機装着用バンドおよび無線機
JP5598827B1 (ja) * 2013-09-13 2014-10-01 哲士 中村 無線通信装置
TWI509891B (zh) * 2013-11-22 2015-11-21 Wistron Neweb Corp 迴圈天線
CN103943957B (zh) * 2014-04-10 2016-05-04 信维创科通信技术（北京）有限公司 一种智能手表及其带扣天线
US9786981B2 (en) * 2014-07-15 2017-10-10 Microsoft Technology Licensing, Llc Antenna for electronic device
TWI553954B (zh) * 2014-07-29 2016-10-11 鴻海精密工業股份有限公司 可攜式電子設備
KR102215995B1 (ko) * 2014-07-31 2021-02-16 엘지전자 주식회사 전자 디바이스
KR102300862B1 (ko) * 2014-09-15 2021-09-13 삼성전자주식회사 전자 장치
DE102015115574A1 (de) 2014-11-13 2016-05-19 Samsung Electronics Co., Ltd. Nahfeldkommunikations-Chip, der in eine tragbare elektronische Vorrichtung eingebettet ist, und tragbare elektronische Vorrichtung
CN105375100A (zh) * 2015-11-12 2016-03-02 上海圣丹纳电子科技有限公司 适用于全金属表壳手表手机的固定式表带天线结构
CN107546462A (zh) * 2016-06-23 2018-01-05 华为终端（东莞）有限公司 一种智能可穿戴产品的近场通信天线及智能可穿戴产品
CN107546461A (zh) * 2016-06-23 2018-01-05 华为终端（东莞）有限公司 一种智能可穿戴产品的近场通信天线及智能可穿戴产品
TWM538608U (zh) 2016-12-16 2017-03-21 Asustek Comp Inc 穿戴式電子裝置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0443491A1 (fr) * 1990-02-20 1991-08-28 Nippon Telegraph And Telephone Corporation Récepteur en forme de montre-bracelet
JPH08330826A (ja) * 1995-03-28 1996-12-13 Seiko Epson Corp 腕装着型携帯無線機
JPH0936630A (ja) * 1995-07-20 1997-02-07 Casio Comput Co Ltd 携帯無線機器用アンテナ
JPH0936640A (ja) * 1995-07-20 1997-02-07 Casio Comput Co Ltd 携帯無線機器用アンテナ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03198532A (ja) * 1989-12-27 1991-08-29 Omron Corp ブレスレット型非接触記録媒体
JP2580087Y2 (ja) * 1991-11-08 1998-09-03 日本ビクター株式会社 Ａｍステレオ放送受信機のバーアンテナ回路
JP2503512Y2 (ja) * 1993-12-27 1996-07-03 清司 金子 レピ―タアンテナ装置
JP3624917B2 (ja) * 1995-05-10 2005-03-02 カシオ計算機株式会社 携帯無線機器用アンテナおよび携帯無線機器
JP3801020B2 (ja) * 2001-11-02 2006-07-26 松下電器産業株式会社 同調アンテナ
EP1315234A1 (fr) * 2001-11-26 2003-05-28 Eta SA Fabriques d'Ebauches Antenne de réception d'ondes VHF logée dans un bracelet de dispositif électronique portable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0443491A1 (fr) * 1990-02-20 1991-08-28 Nippon Telegraph And Telephone Corporation Récepteur en forme de montre-bracelet
JPH08330826A (ja) * 1995-03-28 1996-12-13 Seiko Epson Corp 腕装着型携帯無線機
JPH0936630A (ja) * 1995-07-20 1997-02-07 Casio Comput Co Ltd 携帯無線機器用アンテナ
JPH0936640A (ja) * 1995-07-20 1997-02-07 Casio Comput Co Ltd 携帯無線機器用アンテナ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017133543A1 (fr) 2016-02-01 2017-08-10 Huawei Technologies Co., Ltd. Antenne nfc pour application portable
EP3403294A4 (fr) * 2016-02-01 2019-05-22 Huawei Technologies Co., Ltd. Antenne nfc pour application portable
US11616289B2 (en) 2018-01-15 2023-03-28 Samsung Electronics Co., Ltd Antenna for detecting position of external electronic device and wearable electronic device including the same

Also Published As

Publication number Publication date
HK1086951A1 (en) 2006-09-29
TWI360915B (en) 2012-03-21
ATE411631T1 (de) 2008-10-15
TW200616276A (en) 2006-05-16
CN1716691B (zh) 2011-06-01
KR20060049406A (ko) 2006-05-18
DE602004017150D1 (de) 2008-11-27
KR101180206B1 (ko) 2012-09-05
JP2006020303A (ja) 2006-01-19
JP4644534B2 (ja) 2011-03-02
EP1612884B1 (fr) 2008-10-15
SG118435A1 (en) 2006-01-27
CN1716691A (zh) 2006-01-04

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