EP1612884A1 - Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument - Google Patents
Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument Download PDFInfo
- 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.)
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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
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- 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.
Abstract
Description
- The invention relates to a wrist-carried wireless instrument, and more particularly, to a wristwatch receiver having magnetic loop antennas embedded in the wristband. In the following specification, 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.
- In recent years, such wireless instruments for receiving radio frequency signals with an antenna system embedded in the wristband have become common. Many prior art solutions disclose an antenna device having a circumferentially variable size, embedded in a wristband, for use with a radio that is worn on the arm of a person. By doing this, the antenna can be made long enough to receive frequency signals beyond the VHF band (30-300 MHz). As shown on Figure 3, the
loop antenna 101 can be formed in a unitary fashion inside thewristband 102, which is connected to thecasing 103 of the wrist-carriedwireless instrument 100 to form a continuous loop via acenter fastening structure 104, for example a clasp, of the wristband when the band is fastened. - However, in such arrangements the loop connection at the
center fastening structure 104 significantly influences reception. Consequently it is difficult to design a mechanism that provides favourable operation, as this part is prone to break down. In addition, thewristband 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. - According to the US document No. 5,986,566, it is disclosed a solution, shown on Figure 4, to prevent connection failure and / or breakdown due to attachment or detachment of a loop antenna, of the afore cited type, and to provide a wrist-carried wireless instrument whose receivable frequency band is not affected by the thickness of the wearer's arm.
- The wrist-carried
wireless instrument 110 includes acasing 113, a center fastening-type wristband 112. Thewristband 112 has upper 121 and lower 122 surfaces and afastening structure 114 at its center and consists of a pair ofwristband parts casing 113. A receivingantenna 111 is mounted inside in at least onepart 112a of the wristband to receive signals, theantenna 111 being connected via terminals to a reception circuit inside thecasing 113. According to this document, theloop antenna 111 extends between the upper 121 and lower 122 surfaces of thewristband 112 and does not go through thecenter fastening structure 114. It is to be noted that reception would be possible without having thewristband 112 attached and forming a loop, as it does when worn. - Nevertheless, the solution according to the US document No. 5,986,566 has some drawbacks. Measures done on the antenna structure described hereinbefore show non-optimum antenna efficiency as well as non-optimum noise matching. A non-negligible part of the antenna losses is due to the human wrist interfering with the antenna and also due to the dielectric material of the wristband. Antenna efficiency improvements can be achieved by reducing the ratio of the antenna losses over the antenna radiation resistance. Therefore, antenna efficiency can be improved either by reducing the antenna losses or by increasing the antenna radiation resistance.
- It is then an object of the present invention to improve antenna efficiency by reducing ohmic and dielectric losses of the antenna and increasing the antenna radiation resistance.
- 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. On the one hand, 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.
- In order to achieve the above main object, according to a preferred embodiment of the invention, 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 foregoing and additional objects, features and advantages of the present invention will be more readily apparent from the following detailed description of a preferred embodiment, as illustrated in the accompanying drawings, in which:
- Figure 1 is a cross-sectional view of the wrist-carried wireless instrument according to a preferred embodiment of the invention;
- Figure 2 is a schematic of the antenna circuits inside the casing of the wireless instrument according to a preferred embodiment of the invention;
- Figure 3, already described, is a perspective view of a prior art wrist watch-style pager;
- Figure 4, already described, is a perspective view of another prior art wrist watch-style pager.
- As already mentioned herein before, 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.
- Referring first to Figure 1, a cross-sectional view of a wrist-carried wireless instrument is shown.
Wireless instrument 1 comprises awristband 2 having a first 2a and a second 2b band portions connected to opposite edges of acasing 3, each band portion having upper and lower surfaces. A first 4a and a second 4b loop antennas are embedded respectively in the first andsecond band portions loop antennas casing 3 respectively to a first 5a and second 5b tuning circuits. Both tuning circuits are connected to anantenna receiver 6 arranged in saidcasing 3. Additionally both tuning circuits are connected together in a hybrid manner via aninterconnection 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 antenna receiver 6 via bothtuning circuits interconnection circuit 7 is provided for interconnecting bothtuning circuits loop antennas - As already mentioned herein before, 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 bothloop antennas - For that purpose,
interconnection circuit 7 is designed for interconnecting bothtuning circuits loop antennas interconnection circuit 7 is a capacitor network comprising a first CP1 and a second CP2 capacitors connecting respectively bothtuning circuits tuning circuits - According to the shown example, each loop antenna, respectively 4a and 4b, is connected to the corresponding tuning circuit, respectively 5a and 5b, at two connecting points, respectively 8a, 9a and 8b, 9b. First capacitor CP1 is connected to connecting
point 8a on one side and to connectingpoint 8b on the other side. Second capacitor CP2 is connected to connectingpoint 9a on one side and to connectingpoint 9b on the other side. Bothtuning circuits point 8b on one side and to connectingpoint 9a on the other side. Both circuits are then connected partially in series via third capacitor CS. Lastly,antenna receiver 6 is connected to connectingpoints - It is understood, that in an alternative way the same result can be obtained with third capacitor CS being connected to connecting
points antenna receiver 6 being connected to connectingpoints - With this hybrid connection, 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.
- 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.
- According to the preferred embodiment shown on Figure 2, each antenna tuning circuit, respectively 5a and 5b, is designed for introducing minimum conductive losses by connecting varactors in parallel.
- Therefore
first tuning circuit 5a includes acapacitor 52a and avaractor 51 a connected in series and aresistor 53a connected betweencapacitor 52a andvaractor 51a on one side and to a determined potential VA on the other side.Resistor 53a suppliesvaractor 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 VA is determined by way of conventional means, for example with a binary search algorithm. -
Second tuning circuit 5b is of the same type astuning circuit 5a. It includes acapacitor 52b and avaractor 51 b connected in series and aresistor 53b connected betweencapacitor 52b andvaractor 51 b on one side and to a determined potential VB on the other side.Resistor 53b suppliesvaractor 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 VB is also determined by way of conventional means, for example with a binary search algorithm. - As an alternative, 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.
- To improve large signal response of tuning
circuits varactors - Additionally,
tuning circuits capacitor 52a andvaractor 51a offirst tuning circuit 5a on the one side, and betweenvaractor 51 b andcapacitor 52b ofsecond tuning circuit 5b on the other side. - It is to be noted that the loop antennas are preferably rectangular or so-called opened O-shaped. Advantageously, both loop antennas have the same shape in order to preserve symmetry. However, it is understood that 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.
- It is also to be noted that the wireless instrument is preferably a wristwatch.
- Finally, it is understood that the above-described embodiments are merely illustrative of the many possible specific embodiments, which can represent principles of the present invention. Numerous and varied other arrangements, in particular of the tuning circuits and of the interconnection circuit, can readily be devised in accordance with these principles by those skilled in the art without departing from the scope and spirit of the invention.
Claims (8)
- A wireless instrument (1) comprising- a wristband (2) having a first (2a) and a second (2b) band portions connected to opposite edges of a casing (3), each of said first and second band portions having upper and lower surfaces,- a first (4a) and a second (4b) single loop antennas being embedded respectively in said first and second band portions and extending between said corresponding upper and lower surfaces, both single loop antennas being connected through said opposite edges of said casing to a first (5a) and a second (5b) tuning circuits, wherein- said first and second tuning circuits are connected to an antenna receiver (6) arranged in said casing and together in a hybrid manner via an interconnection circuit (7), both tuning circuits being connected partially in parallel and partially in series.
- The wireless instrument according to claim 1, wherein said interconnection circuit is a capacitor network comprising a first (CP1) and a second (CP2) capacitors connecting said first and second tuning circuits partially in parallel, and a third capacitor (CS) connecting said first and second tuning circuits partially in series.
- The wireless instrument according to claim 2, wherein each of said first and second tuning circuits has a first (8a, 8b) and a second (9a, 9b) connecting points, wherein said first and second capacitors are respectively connected to said first connecting points and to said second connecting points of both tuning circuits, and said third capacitor is connected to said second connecting point of said first tuning circuit and to said first connecting point of said second tuning circuit, and wherein said antenna receiver is connected between said first connecting point of said first tuning circuit and said second connecting point of said second tuning circuit.
- The wireless instrument according to any preceding claims, wherein each of said first and second tuning circuits is formed by a capacitor (52a, 52b) and a varactor (51 a, 51 b) in series and by a resistor (53a, 53b) connected between said capacitor and said varactor on one side and to a determined potential (VA, VB) on the other side.
- The wireless instrument according to claim 4, wherein a capacitor (CT) for adjusting tuning range of said first and second tuning circuits is connected between said capacitor and said varactor of said first tuning circuit on the one side and between said varactor and said capacitor of said second tuning circuit on the other side.
- The wireless instrument according to any preceding claims, wherein both single loop antennas are substantially rectangular or opened O shaped.
- The wireless instrument according to any of preceding claims, wherein both single loop antennas operate in the frequency band from 88 to 108 MHz.
- The wireless instrument according to any preceding claims, wherein said wireless instrument is a wristwatch.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04103146T ATE411631T1 (en) | 2004-07-02 | 2004-07-02 | CONNECTION CIRCUIT BETWEEN TWO LOOP ANTENNAS INTEGRATED IN A WRISTBAND WIRELESS DEVICE |
DE602004017150T DE602004017150D1 (en) | 2004-07-02 | 2004-07-02 | Connection between two loop antennas integrated in a wristband to be worn on the wireless device |
EP04103146A EP1612884B1 (en) | 2004-07-02 | 2004-07-02 | Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument |
TW094120028A TWI360915B (en) | 2004-07-02 | 2005-06-16 | Interconnection circuit between two loop antennas |
KR1020050052707A KR101180206B1 (en) | 2004-07-02 | 2005-06-18 | Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument |
JP2005179031A JP4644534B2 (en) | 2004-07-02 | 2005-06-20 | Interconnection circuit between two loop antennas embedded in the wristband of a wireless device worn on the wrist |
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 (en) | 2004-07-02 | 2005-06-28 | Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument |
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 (en) | 2004-07-02 | 2004-07-02 | Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1612884A1 true EP1612884A1 (en) | 2006-01-04 |
EP1612884B1 EP1612884B1 (en) | 2008-10-15 |
Family
ID=34929287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04103146A Active EP1612884B1 (en) | 2004-07-02 | 2004-07-02 | Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1612884B1 (en) |
JP (1) | JP4644534B2 (en) |
KR (1) | KR101180206B1 (en) |
CN (1) | CN1716691B (en) |
AT (1) | ATE411631T1 (en) |
DE (1) | DE602004017150D1 (en) |
HK (1) | HK1086951A1 (en) |
SG (1) | SG118435A1 (en) |
TW (1) | TWI360915B (en) |
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US9786981B2 (en) * | 2014-07-15 | 2017-10-10 | Microsoft Technology Licensing, Llc | Antenna for electronic device |
TWI553954B (en) * | 2014-07-29 | 2016-10-11 | 鴻海精密工業股份有限公司 | Portable electronic device |
KR102215995B1 (en) * | 2014-07-31 | 2021-02-16 | 엘지전자 주식회사 | Electronic device |
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CN107546462A (en) * | 2016-06-23 | 2018-01-05 | 华为终端(东莞)有限公司 | The near-field communication aerial and the wearable product of intelligence of a kind of wearable product of intelligence |
CN107546461A (en) * | 2016-06-23 | 2018-01-05 | 华为终端(东莞)有限公司 | The near-field communication aerial and the wearable product of intelligence of a kind of wearable product of intelligence |
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JP2580087Y2 (en) * | 1991-11-08 | 1998-09-03 | 日本ビクター株式会社 | Bar antenna circuit of AM stereo broadcast receiver |
JP2503512Y2 (en) * | 1993-12-27 | 1996-07-03 | 清司 金子 | Repeater antenna device |
JP3624917B2 (en) * | 1995-05-10 | 2005-03-02 | カシオ計算機株式会社 | Antenna for portable wireless device and portable wireless device |
JP3801020B2 (en) * | 2001-11-02 | 2006-07-26 | 松下電器産業株式会社 | Tuning antenna |
EP1315234A1 (en) * | 2001-11-26 | 2003-05-28 | Eta SA Fabriques d'Ebauches | VHF receiving antenna housed in the bracelet of a portable electronic device |
-
2004
- 2004-07-02 EP EP04103146A patent/EP1612884B1/en active Active
- 2004-07-02 AT AT04103146T patent/ATE411631T1/en not_active IP Right Cessation
- 2004-07-02 DE DE602004017150T patent/DE602004017150D1/en active Active
-
2005
- 2005-06-16 TW TW094120028A patent/TWI360915B/en not_active IP Right Cessation
- 2005-06-18 KR KR1020050052707A patent/KR101180206B1/en not_active IP Right Cessation
- 2005-06-20 JP JP2005179031A patent/JP4644534B2/en not_active Expired - Fee Related
- 2005-06-27 SG SG200504843A patent/SG118435A1/en unknown
- 2005-06-28 CN CN2005100797819A patent/CN1716691B/en not_active Expired - Fee Related
-
2006
- 2006-06-16 HK HK06106895.7A patent/HK1086951A1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0443491A1 (en) * | 1990-02-20 | 1991-08-28 | Nippon Telegraph And Telephone Corporation | Wrist watch type receiver |
JPH08330826A (en) * | 1995-03-28 | 1996-12-13 | Seiko Epson Corp | Arm-mounted type portable radio equipment |
JPH0936640A (en) * | 1995-07-20 | 1997-02-07 | Casio Comput Co Ltd | Antenna for portable radio equipment |
JPH0936630A (en) * | 1995-07-20 | 1997-02-07 | Casio Comput Co Ltd | Antenna for portable radio device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017133543A1 (en) | 2016-02-01 | 2017-08-10 | Huawei Technologies Co., Ltd. | Nfc antenna for wearable application |
EP3403294A4 (en) * | 2016-02-01 | 2019-05-22 | Huawei Technologies Co., Ltd. | Nfc antenna for wearable application |
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 |
---|---|
SG118435A1 (en) | 2006-01-27 |
JP4644534B2 (en) | 2011-03-02 |
HK1086951A1 (en) | 2006-09-29 |
CN1716691A (en) | 2006-01-04 |
CN1716691B (en) | 2011-06-01 |
JP2006020303A (en) | 2006-01-19 |
TWI360915B (en) | 2012-03-21 |
TW200616276A (en) | 2006-05-16 |
ATE411631T1 (en) | 2008-10-15 |
KR101180206B1 (en) | 2012-09-05 |
DE602004017150D1 (en) | 2008-11-27 |
EP1612884B1 (en) | 2008-10-15 |
KR20060049406A (en) | 2006-05-18 |
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