CN104038176A - Wearable device and antenna self-adaption impedance matching system thereof - Google Patents
Wearable device and antenna self-adaption impedance matching system thereof Download PDFInfo
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- CN104038176A CN104038176A CN201410268477.8A CN201410268477A CN104038176A CN 104038176 A CN104038176 A CN 104038176A CN 201410268477 A CN201410268477 A CN 201410268477A CN 104038176 A CN104038176 A CN 104038176A
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- impedance matching
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Abstract
The invention discloses an antenna self-adaption impedance matching system. The antenna self-adaption impedance matching system comprises a sensor, a first bilateral switch, a second bilateral switch, a first impedance matching loop and a second impedance matching loop, wherein the first bilateral switch and the second bilateral switch are respectively connected with a sensor, a fixation end of the first bilateral switch is connected with a port, the port is connected with a radio-frequency circuit, a fixation end of the second bilateral switch is connected with an antenna, the sensor is used for detecting whether a fixation band contacts the skin, free ends of the first bilateral switch and the second bilateral switch are controlled to be respectively connected with the first impedance matching loop when contact between the fixation strip and the skin is detected, the free ends of the first bilateral switch and the second bilateral switch are respectively connected with the second impedance matching loop when no contact between the fixation strip and the skin is detected, the second impedance matching loop is a T-shaped loop consisting of two inductors and a capacitor, and the first impedance matching loop is an n-shaped loop consisting of two LC parallel loops and an inductor. The invention further discloses a wearable device with the antenna self-adaption impedance matching system.
Description
Technical field
The present invention relates to a kind of wearable device and antenna self-adaptive impedance matching system thereof.
background technology m
Current intelligent watch can comprise mobile communication, i.e. antenna in mobile phone and be assigned with communication frequency makes intelligent watch become one and needn't remove to connect the independently device that mobile phone or miscellaneous equipment carry out mobile communication by bluetooth.
Generally, wrist-watch, because products characteristics is to be subject to spatial limitation, cannot provide the larger ground plane of the antenna needs of low-frequency range 700/800/850/900MHz, and this makes wrist-watch realize low band honeycomb frequency becomes a difficult problem.A solution is that antenna or ground plane are extended to intelligent watch band, and still, the close skin of antenna has very high permittivity, has a strong impact on antenna return loss and signal radiance.
Wearable device is intelligent watch for example, on being worn on wrist and while being positioned over free space two states, owing to approaching skin and the difference of the permittivity of free space, make the frequency adjustment of antenna to be matched to meet under two states simultaneously all can work.The match circuit of adjusting antenna when us meets to be worn while working under state, if wrist-watch is placed under free space, the frequency of antenna can be drifted about, make cannot carry out communication under free state, otherwise, if by antenna adjustment coupling and free space operating frequency, when being worn on wrist, frequency can produce drift.
Summary of the invention
For addressing the above problem, the technical scheme that the present invention adopts is:
A kind of antenna self-adaptive impedance matching system is provided, be applied in wearable device, described wearable device comprises body and for body being bundled in to the fixed band on skin, in described body, circuit board is installed, this circuit board is provided with radio circuit, in described fixed band, is fixed with antenna; Described antenna self-adaptive impedance matching system comprises transducer, the first bidirectional switch being connected respectively with transducer and the second bidirectional switch, is arranged at the first impedance matching loop and the second impedance matching loop between the first bidirectional switch and the second bidirectional switch respectively, described the first bidirectional switch stiff end is connected with port, described port is connected with radio circuit, and described the second bidirectional switch stiff end is connected with antenna; Described transducer is used for detecting fixed band and whether contacts skin, and the free end of controlling the first bidirectional switch and the second bidirectional switch when detecting fixed band contact skin is connected respectively the first impedance matching loop; When the free end that detects fixed band and do not have contact to control the first bidirectional switch and the second bidirectional switch during skin is connected respectively the second impedance matching loop.
The invention provides a kind of wearable device and antenna self-adaptive impedance matching system thereof, the antenna of wearable device can be by using matching circuit to be optimized, fixed band at wearable device is wrapped on skin and is placed under two states of free space, by transducer, state responded to respectively and controlled the first bidirectional switch and the second bidirectional switch and select to connect corresponding impedance matching loop, make the antenna in fixed band no matter press close to skin or at free space, thereby all can reach good return loss, antenna is well operated in any case.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of wearable device in an embodiment of the present invention;
Fig. 2 is the structured flowchart of antenna self-adaptive impedance matching system;
Fig. 3 is the circuit diagram in the first impedance matching loop in Fig. 2;
Fig. 4 is the circuit diagram in the second impedance matching loop in Fig. 2;
Fig. 5 is the aerial signal schematic diagram of the wearable device under the matching circuit of optimizing in free space;
Fig. 6 is the aerial signal schematic diagram of the wearable device under manual matching circuit;
Fig. 7 is the aerial signal schematic diagram of the wearable device under matching circuit of the present invention.
Main element symbol description
Wearable device 100
Fixed band 10
Antenna 11
Antenna self-adaptive impedance matching system 20
Transducer 21
The first bidirectional switch 22
Two-way two switches 23
The first impedance matching loop 24
The second impedance matching loop 25
Port 26
Body 30
Circuit board 40
Embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with execution mode and coordinate accompanying drawing to be explained in detail.
The invention provides a kind of wearable device and antenna self-adaptive impedance matching system thereof, by adopting sensor detecting, be to come control connection to be connected at two bidirectional switchs and which match circuit of antenna and wrist-watch PORT COM in wearing state or free space state, two match circuits are adjusted respectively the most accurate wear state and the impedance of free space state, no matter make intelligent watch all can aim at communication frequency under state or under free space and carry out work wearing, thereby reach good return loss, antenna be operated in any case effectively.
Refer to Fig. 1, Fig. 2, Fig. 1 is the stereogram of wearable device in an embodiment of the present invention, and Fig. 2 is the structured flowchart of antenna self-adaptive impedance matching system.
Wearable device 100 comprises body 30 and for body 30 being bundled in to the fixed band 10 on skin, circuit board 40 is installed in described body, and this circuit board is provided with radio circuit (not shown).In the present embodiment, described body consists of metal material.
In described fixed band 10, be fixed with antenna 11, described antenna 11 is connected in antenna self-adaptive impedance matching system 20, described antenna self-adaptive impedance matching system 20 comprises transducer 21, the first bidirectional switch 22 and two-way two switches 23 that are connected respectively with transducer 21, be arranged at respectively the first impedance matching loop 24 and the second impedance matching loop 25 between the first bidirectional switch 22 and the second bidirectional switch 23, wherein, the stiff end of described the first bidirectional switch 22 is connected with port 26, the stiff end of described the second bidirectional switch 23 is connected 11 with antenna, described port 26 is connected with radio circuit.
Whether described transducer 21 contacts skin for detecting fixed band 10, and in the present embodiment, described transducer 21 is infrared sensor.In another embodiment, described transducer 21 also can adopt acceleration transducer.
See also Fig. 3, Fig. 4, Fig. 3 is the circuit diagram in the first impedance matching loop, and Fig. 4 is the circuit diagram in the second impedance matching loop.The second impedance matching loop 25 is by two inductance and a T-shaped loop that electric capacity forms, and the first impedance matching loop is by two LC shunt circuits and a π type loop that inductance forms.These two kinds of match circuits should carry out refinement or optimal design with the different situations of the equipment of wearing.Diagram circuit is only design reference.
The free end of controlling the first bidirectional switch 22 and the second bidirectional switch 23 when detecting fixed band 10 contact skin is connected respectively the first impedance matching loop 24.
When detecting fixed band 10, do not have contact during skin, the free end that described transducer 21 is controlled the first bidirectional switchs 22 and the second bidirectional switch 23 is connected respectively the second impedance matching loop 25.
The invention provides a kind of wearable device and antenna self-adaptive impedance matching system thereof, the antenna of wearable device can be screened the state of wearing by transducer, removing to connect corresponding match circuit is optimized, fixed band at wearable device is wrapped on skin and is placed under two states of free space, by transducer, state responded to respectively and controlled the first bidirectional switch and the second bidirectional switch and select to connect corresponding impedance matching circuit, make the antenna in fixed band no matter press close to skin still at free space, thereby all can reach good return loss is well operated in any case antenna.
Referring on the S1.1 wrist in Fig. 5 and free space matching performance (S1,1_OH_FSmatched) and S1.1 free space matching performance (S1,1_FS_Matched) curve is visible, under the matching circuit that wearable device is optimized in free space, it is joined when being positioned over empty place and dressing, and aerial signal can produce huge difference.Fig. 6 has configured a manual matching circuit, matching performance (S1 on S1.1 free space-wrist in figure, 1FS_OHmatched) with S1.1 free space matching properties (S1,1_OH_matched) curve is known, though avoid free space matching circuit whether wear aerial signal difference can be smaller, but obviously can have a remarkable off resonance, why Here it is needs a RF switch to carry out to select according to the residing position of wearing equipment the reason of matching network in the art of this patent.In order to address the above problem, this patent target is to relate to one and can (wears in all cases, or be placed in free space), the impedance matching loop that energy intelligence is switched, by adopting the technology of the present invention, the aerial signal schematic diagram of whether wearing is finally shown in S1.1 free space matching performance (S1,1_FS_Matched) and S1.1 free space matching properties (S1 in Fig. 7, visible both differences of curve chart 1_OH_matched) are less, can meet application demand.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. an antenna self-adaptive impedance matching system, be applied in wearable device, described wearable device comprises body and for body being bundled in to the fixed band on skin, in described body, circuit board is installed, this circuit board is provided with radio circuit, in described fixed band, be fixed with antenna, it is characterized in that:
Described antenna self-adaptive impedance matching system comprises transducer, the first bidirectional switch being connected respectively with transducer and the second bidirectional switch, is arranged at the first impedance matching loop and the second impedance matching loop between the first bidirectional switch and the second bidirectional switch respectively, described the first bidirectional switch stiff end is connected with port, described port is connected with radio circuit, and described the second bidirectional switch stiff end is connected with antenna;
Described transducer is used for detecting fixed band and whether contacts skin, and the free end of controlling the first bidirectional switch and the second bidirectional switch when detecting fixed band contact skin is connected respectively the first impedance matching loop; When the free end that detects fixed band and do not have contact to control the first bidirectional switch and the second bidirectional switch during skin is connected respectively the second impedance matching loop.
2. a kind of antenna self-adaptive impedance matching system according to claim 1, it is characterized in that, the second impedance matching loop is by two inductance and a T-shaped loop that electric capacity forms, and the first impedance matching loop is by two LC shunt circuits and a π type loop that inductance forms.
3. a kind of antenna self-adaptive impedance matching system according to claim 1, is characterized in that, described transducer is infrared sensor.
4. a kind of antenna self-adaptive impedance matching system according to claim 1, is characterized in that, described transducer is acceleration transducer.
5. a wearable device, be applied in wearable device, described wearable device comprises body and for body being bundled in to the fixed band on skin, in described body, circuit board is installed, this circuit board is provided with radio circuit, in described fixed band, is fixed with antenna, it is characterized in that, also comprise antenna self-adaptive impedance matching system, described antenna self-adaptive impedance matching system is as described in claim 1-4 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410268477.8A CN104038176A (en) | 2014-06-16 | 2014-06-16 | Wearable device and antenna self-adaption impedance matching system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410268477.8A CN104038176A (en) | 2014-06-16 | 2014-06-16 | Wearable device and antenna self-adaption impedance matching system thereof |
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| CN104038176A true CN104038176A (en) | 2014-09-10 |
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| CN201410268477.8A Pending CN104038176A (en) | 2014-06-16 | 2014-06-16 | Wearable device and antenna self-adaption impedance matching system thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654515A (en) * | 2017-03-02 | 2017-05-10 | 广东小天才科技有限公司 | Intelligent wearable electronic equipment |
| WO2018121379A1 (en) * | 2016-12-29 | 2018-07-05 | 歌尔股份有限公司 | Smart watch and antenna signal processing circuit and method thereof |
| CN110474168A (en) * | 2018-05-13 | 2019-11-19 | 仁宝电脑工业股份有限公司 | Antenna assembly and electronic device |
| WO2020052326A1 (en) * | 2018-09-13 | 2020-03-19 | 广东小天才科技有限公司 | Smart watch having dual-antenna structure, and control method |
| CN113193337A (en) * | 2021-04-15 | 2021-07-30 | 安徽华米健康医疗有限公司 | Wearable device and wearing detection method thereof |
| CN114488767A (en) * | 2020-10-27 | 2022-05-13 | Oppo广东移动通信有限公司 | Wearable equipment and intelligent wrist-watch |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4817196A (en) * | 1987-01-02 | 1989-03-28 | Motorola, Inc. | Apparatus for tuning the antenna of a miniature personal communications device |
| JPH0787541A (en) * | 1993-06-28 | 1995-03-31 | Casio Comput Co Ltd | Wrist watch radio receiver |
| CN1287460A (en) * | 1999-09-07 | 2001-03-14 | 日本电气株式会社 | Mobile telephone capable of compensating antenna impedance change |
| CN1316795A (en) * | 2000-03-22 | 2001-10-10 | 松下电器产业株式会社 | Aerical device |
| CN101778162A (en) * | 2010-01-20 | 2010-07-14 | 中兴通讯股份有限公司 | Method for improving wireless performance of communication terminal and communication terminal thereof |
| WO2011129983A2 (en) * | 2010-04-13 | 2011-10-20 | Apple Inc. | Adjustable wireless circuitry with antenna-based proximity detector |
| CN102394372A (en) * | 2010-07-06 | 2012-03-28 | 苹果公司 | Electronic device and tunable antenna system |
| CN103107827A (en) * | 2011-11-15 | 2013-05-15 | 纬创资通股份有限公司 | Mobile communication device and wireless communication signal adjusting method thereof |
| US20130172691A1 (en) * | 2006-05-16 | 2013-07-04 | Bao Tran | Health monitoring appliance |
| CN103368595A (en) * | 2012-04-11 | 2013-10-23 | 中兴通讯股份有限公司 | Method and device for adjusting radiation of mobile terminal and mobile terminal |
| CN203984367U (en) * | 2014-06-16 | 2014-12-03 | 信维创科通信技术（北京）有限公司 | A kind of wearable device and antenna self-adaptive impedance matching system thereof |
-
2014
- 2014-06-16 CN CN201410268477.8A patent/CN104038176A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4817196A (en) * | 1987-01-02 | 1989-03-28 | Motorola, Inc. | Apparatus for tuning the antenna of a miniature personal communications device |
| JPH0787541A (en) * | 1993-06-28 | 1995-03-31 | Casio Comput Co Ltd | Wrist watch radio receiver |
| CN1287460A (en) * | 1999-09-07 | 2001-03-14 | 日本电气株式会社 | Mobile telephone capable of compensating antenna impedance change |
| CN1316795A (en) * | 2000-03-22 | 2001-10-10 | 松下电器产业株式会社 | Aerical device |
| US20130172691A1 (en) * | 2006-05-16 | 2013-07-04 | Bao Tran | Health monitoring appliance |
| CN101778162A (en) * | 2010-01-20 | 2010-07-14 | 中兴通讯股份有限公司 | Method for improving wireless performance of communication terminal and communication terminal thereof |
| WO2011129983A2 (en) * | 2010-04-13 | 2011-10-20 | Apple Inc. | Adjustable wireless circuitry with antenna-based proximity detector |
| CN102394372A (en) * | 2010-07-06 | 2012-03-28 | 苹果公司 | Electronic device and tunable antenna system |
| CN103107827A (en) * | 2011-11-15 | 2013-05-15 | 纬创资通股份有限公司 | Mobile communication device and wireless communication signal adjusting method thereof |
| CN103368595A (en) * | 2012-04-11 | 2013-10-23 | 中兴通讯股份有限公司 | Method and device for adjusting radiation of mobile terminal and mobile terminal |
| CN203984367U (en) * | 2014-06-16 | 2014-12-03 | 信维创科通信技术（北京）有限公司 | A kind of wearable device and antenna self-adaptive impedance matching system thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018121379A1 (en) * | 2016-12-29 | 2018-07-05 | 歌尔股份有限公司 | Smart watch and antenna signal processing circuit and method thereof |
| US10797378B2 (en) | 2016-12-29 | 2020-10-06 | Goertek Inc. | Smart watch and antenna signal processing circuit and method thereof |
| CN106654515A (en) * | 2017-03-02 | 2017-05-10 | 广东小天才科技有限公司 | Intelligent wearable electronic equipment |
| CN106654515B (en) * | 2017-03-02 | 2023-11-24 | 广东小天才科技有限公司 | Intelligent wearable electronic equipment |
| CN110474168A (en) * | 2018-05-13 | 2019-11-19 | 仁宝电脑工业股份有限公司 | Antenna assembly and electronic device |
| WO2020052326A1 (en) * | 2018-09-13 | 2020-03-19 | 广东小天才科技有限公司 | Smart watch having dual-antenna structure, and control method |
| CN114488767A (en) * | 2020-10-27 | 2022-05-13 | Oppo广东移动通信有限公司 | Wearable equipment and intelligent wrist-watch |
| CN114488767B (en) * | 2020-10-27 | 2024-03-08 | Oppo广东移动通信有限公司 | Wearable equipment and intelligent wrist-watch |
| CN113193337A (en) * | 2021-04-15 | 2021-07-30 | 安徽华米健康医疗有限公司 | Wearable device and wearing detection method thereof |
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Application publication date: 20140910 |
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