CN107069240B - NFC antenna circuit for all-metal frame watch - Google Patents
NFC antenna circuit for all-metal frame watch Download PDFInfo
- Publication number
- CN107069240B CN107069240B CN201611247636.1A CN201611247636A CN107069240B CN 107069240 B CN107069240 B CN 107069240B CN 201611247636 A CN201611247636 A CN 201611247636A CN 107069240 B CN107069240 B CN 107069240B
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- Prior art keywords
- amplifier
- circuit
- amplifying circuit
- induction coil
- nfc antenna
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- 239000002184 metal Substances 0.000 title claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 32
- 230000006698 induction Effects 0.000 claims abstract description 38
- 239000003990 capacitor Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000000191 radiation effect Effects 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Electric Clocks (AREA)
Abstract
The invention discloses an NFC antenna circuit for an all-metal frame watch, which comprises an all-metal NFC antenna body provided with a feed point, a balun converter, a first amplifying circuit, a second amplifying circuit, a matching circuit and a rear-end circuit for processing antenna signals, wherein an induction coil is arranged on the inner side of the all-metal NFC antenna body; the input end of the balun transformer is connected with the feed point, the first output end of the balun transformer is connected with the input end of the first amplifying circuit, a matching circuit is connected between the second output end of the balun transformer and the first wiring end of the induction coil, the second wiring end of the induction coil is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit and the output end of the first amplifying circuit are respectively connected with the back-end circuit. The diode has unidirectional conductivity, can ensure that the current leading to the induction coil is the largest, and the generated induction field is the strongest, thereby enhancing the radiation effect of electromagnetic waves generated by the all-metal NFC antenna body.
Description
Technical Field
The invention relates to an NFC antenna circuit for an all-metal frame watch.
Background
Along with the development of technology and the improvement of living standard of people, the functional requirements of people on the watch are also higher and higher. The watch is mainly used for checking time in the early stage, and later becomes a portable ornament, and at present, many intelligent watches even have a communication function. The existing communication smart watch is usually provided with an antenna, however, due to the small size of the watch, the radiation effect of electromagnetic waves generated by the antenna is poor, resulting in poor communication effect of the watch, and therefore, a new antenna circuit is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide an NFC antenna circuit for an all-metal frame watch, which can strengthen the radiation effect of electromagnetic waves generated by an antenna.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an NFC antenna circuit for an all-metal frame watch comprises an all-metal NFC antenna body serving as a frame of the watch, wherein a feed point is arranged on the all-metal NFC antenna body, an induction coil is arranged on the inner side of the all-metal NFC antenna body, and the induction coil comprises a first wiring terminal and a second wiring terminal; the NFC antenna circuit further comprises a balun, a first amplifying circuit, a second amplifying circuit, a matching circuit and a back-end circuit for processing antenna signals; the balun transformer comprises an input end, a first output end and a second output end, wherein the input end of the balun transformer is connected with the feed point, the first output end of the balun transformer is connected with the input end of the first amplifying circuit, the matching circuit is connected between the second output end of the balun transformer and the first wiring end of the induction coil, the second wiring end of the induction coil is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit and the output end of the first amplifying circuit are respectively connected with the back-end circuit.
Preferably, the matching circuit comprises a first capacitor, a second capacitor and a first inductor, the first inductor comprises a first terminal and a second terminal, the first capacitor is connected between the first terminal of the first inductor and the ground wire, the second capacitor is connected between the second terminal of the first inductor and the ground wire, the first terminal of the first inductor is connected with the second output end of the balun transformer, and the second terminal of the first inductor is connected with the first terminal of the induction coil.
Preferably, the induction coil is formed by winding a metal wire into 5-6 coils, the cross section diameter of each coil is 0.2mm, the distance between every two adjacent coils is 0.1mm, each coil is connected with two diodes in series, a connecting wire between the centers of the two diodes passes through the center of the induction coil, and when the induction coil is electrified, current flows from the anode of each diode to the cathode of each diode.
Preferably, the first amplifying circuit and the second amplifying circuit each comprise a first amplifier, a second amplifier, a third amplifier, first to sixth resistors and an adjustable resistor, wherein the positive input end of the first amplifier forms the input end of the amplifying circuit, the first resistor is connected between the negative input end of the first amplifier and the output end of the first amplifier, the adjustable resistor is connected between the negative input end of the first amplifier and the negative input end of the second amplifier, the second resistor is connected between the output end of the first amplifier and the negative input end of the third amplifier, the third resistor is connected between the negative input end of the third amplifier and the output end of the third amplifier, the output end of the third amplifier forms the output end of the amplifying circuit, the fifth resistor is connected between the negative input end of the second amplifier and the positive input end of the third amplifier, and the fourth resistor is connected between the positive input end of the third amplifier and the sixth resistor. The induction coil is coated with a layer of copper with the thickness of 0.5mm on the surface close to the front surface of the all-metal frame watch.
Compared with the prior art, the NFC antenna circuit for the all-metal frame watch has the beneficial effects that: the diode has unidirectional conductivity, can ensure that the current leading to the induction coil is the largest, and the generated induction field is the strongest, thereby enhancing the radiation effect of electromagnetic waves generated by the all-metal NFC antenna body.
Drawings
Fig. 1 is a block diagram of a circuit configuration of an NFC antenna circuit for an all-metal bezel wristwatch of the present invention;
FIG. 2 is a schematic circuit diagram of the first amplifying circuit or the second amplifying circuit according to the present invention;
FIG. 3 is a schematic circuit diagram of a matching circuit according to the present invention;
fig. 4 is a schematic structural diagram of an induction coil according to the present invention.
Detailed Description
The invention is further described below in connection with specific embodiments.
Referring to fig. 1 to 4, the present invention provides an NFC antenna circuit for an all-metal bezel wristwatch, which includes an all-metal NFC antenna body serving as a bezel of the wristwatch, wherein a feeding point is provided on the all-metal NFC antenna body, an induction coil is mounted on an inner side of the all-metal NFC antenna body, and the induction coil includes a first terminal and a second terminal; the NFC antenna circuit further comprises a balun, a first amplifying circuit, a second amplifying circuit, a matching circuit and a back-end circuit for processing antenna signals; the balun transformer comprises an input end, a first output end and a second output end, wherein the input end of the balun transformer is connected with the feed point, the first output end of the balun transformer is connected with the input end of the first amplifying circuit, the matching circuit is connected between the second output end of the balun transformer and the first wiring end of the induction coil, the second wiring end of the induction coil is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit and the output end of the first amplifying circuit are respectively connected with the back-end circuit.
The matching circuit comprises a first capacitor C1, a second capacitor C2 and a first inductor L, wherein the first inductor L comprises a first wiring end and a second wiring end, the first capacitor C1 is connected between the first wiring end of the first inductor L and a ground wire, the second capacitor C2 is connected between the second wiring end of the first inductor L and the ground wire, the first wiring end of the first inductor L is connected with a second output end of the balun transformer, and the second wiring end of the first inductor L is connected with a first wiring end of the induction coil.
In the invention, the induction coil is formed by winding a metal wire into 5-6 coils, the cross section diameter of each coil is 0.2mm, the distance between every two adjacent coils is 0.1mm, each coil is connected with two diodes in series, the connecting wire between the centers of the two diodes passes through the center of the induction coil, and when the induction coil is electrified, current flows from the anode of each diode to the cathode of each diode.
The first amplifying circuit and the second amplifying circuit comprise a first amplifier A1, a second amplifier A2, a third amplifier A3, first to sixth resistors and an adjustable resistor Rg, wherein the positive input end of the first amplifier A1 forms the input end of the amplifying circuit, the first resistor R1 is connected between the negative input end of the first amplifier A1 and the output end of the first amplifier A1, the adjustable resistor Rg is connected between the negative input end of the first amplifier A1 and the negative input end of the second amplifier A2, the second resistor R2 is connected between the output end of the first amplifier A1 and the negative input end of the third amplifier A3, the third resistor R3 is connected between the negative input end of the third amplifier A3 and the output end of the third amplifier A3, the output end of the third amplifier A3 forms the output end of the amplifying circuit, the fourth resistor R4 is connected between the negative input end of the second amplifier A2 and the negative input end of the second amplifier A2, and the fourth resistor R3 is connected between the positive input end of the third amplifier A3 and the fourth amplifier A4, and the fifth resistor R5 is connected between the negative input end of the third amplifier A3 and the third amplifier A3.
In practical application, in order to avoid interference of the induction coil to the watch screen, the induction coil is coated with a layer of copper with the thickness of 0.5mm on the surface close to the front surface of the all-metal frame watch, so that the water ripple phenomenon of the watch screen is reduced. The back-end circuit comprises a radio frequency circuit, a microprocessor, peripheral circuits and the like.
In summary, the diode of the invention has unidirectional conductivity, and can ensure that the current leading to the induction coil is the largest and the generated induction field is the strongest, thereby enhancing the radiation effect of electromagnetic waves generated by the all-metal NFC antenna body.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (3)
1. An NFC antenna circuit for an all-metal frame watch is characterized by comprising an all-metal NFC antenna body serving as a frame of the watch, wherein a feed point is arranged on the all-metal NFC antenna body, an induction coil is arranged on the inner side of the all-metal NFC antenna body, and the induction coil comprises a first wiring end and a second wiring end; the NFC antenna circuit further comprises a balun, a first amplifying circuit, a second amplifying circuit, a matching circuit and a back-end circuit for processing antenna signals; the balun converter comprises an input end, a first output end and a second output end, wherein the input end of the balun converter is connected with the feed point, the first output end of the balun converter is connected with the input end of the first amplifying circuit, the matching circuit is connected between the second output end of the balun converter and the first wiring end of the induction coil, the second wiring end of the induction coil is connected with the input end of the second amplifying circuit, and the output end of the second amplifying circuit and the output end of the first amplifying circuit are respectively connected with the rear-end circuit; the matching circuit comprises a first capacitor, a second capacitor and a first inductor, wherein the first inductor comprises a first wiring end and a second wiring end, the first capacitor is connected between the first wiring end of the first inductor and a ground wire, the second capacitor is connected between the second wiring end of the first inductor and the ground wire, the first wiring end of the first inductor is connected with the second output end of the balun transformer, and the second wiring end of the first inductor is connected with the first wiring end of the induction coil; the induction coil is formed by winding a metal wire into 5-6 coils, the diameter of the cross section of each coil is 0.2mm, the distance between every two adjacent coils is 0.1mm, each coil is connected with two diodes in series, a connecting wire between the centers of the two diodes passes through the center of the induction coil, and when the induction coil is electrified, current flows from the anode of each diode to the cathode of each diode.
2. The NFC antenna circuit for an all-metal bezel wristwatch of claim 1, wherein the first amplifying circuit and the second amplifying circuit each include a first amplifier, a second amplifier, a third amplifier, first to sixth resistors, and an adjustable resistor, a positive input of the first amplifier forms an input of the amplifying circuit, a first resistor is connected between a negative input of the first amplifier and an output of the first amplifier, the adjustable resistor is connected between a negative input of the first amplifier and a negative input of the second amplifier, a second resistor is connected between an output of the first amplifier and a negative input of the third amplifier, a third resistor is connected between a negative input of the third amplifier and an output of the third amplifier, an output of the third amplifier forms an output of the amplifying circuit, a negative input of the second amplifier and an output of the second amplifier are connected with a fourth resistor, a positive input of the second amplifier and a positive input of the third amplifier are connected with a positive input of the fifth amplifier.
3. An NFC antenna circuit for an all-metal bezel wristwatch as defined in claim 1, wherein said induction coil is coated with a layer of copper having a thickness of 0.5mm on a surface near the front face of said all-metal bezel wristwatch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611247636.1A CN107069240B (en) | 2016-12-29 | 2016-12-29 | NFC antenna circuit for all-metal frame watch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611247636.1A CN107069240B (en) | 2016-12-29 | 2016-12-29 | NFC antenna circuit for all-metal frame watch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107069240A CN107069240A (en) | 2017-08-18 |
| CN107069240B true CN107069240B (en) | 2024-03-19 |
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ID=59624295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611247636.1A Active CN107069240B (en) | 2016-12-29 | 2016-12-29 | NFC antenna circuit for all-metal frame watch |
Country Status (1)
| Country | Link |
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| CN (1) | CN107069240B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107863602A (en) * | 2017-10-10 | 2018-03-30 | 深圳市信维通信股份有限公司 | A kind of all-metal wrist-watch antenna system |
| CN109149136A (en) * | 2018-09-11 | 2019-01-04 | 深圳市思讯通信技术有限公司 | A kind of tunable built-in antenna mould group and intelligent door lock of intelligent door lock |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965445A (en) * | 2004-05-18 | 2007-05-16 | 松下电器产业株式会社 | Antenna assembly and wireless unit employing it |
| US7378851B1 (en) * | 2006-12-11 | 2008-05-27 | General Electric Company | Integrated low noise amplifier and balun for MRI receivers |
| CN105446127A (en) * | 2015-12-25 | 2016-03-30 | 惠州硕贝德无线科技股份有限公司 | Wearable device with near-field communication function |
| CN106207442A (en) * | 2016-06-29 | 2016-12-07 | 青岛海信移动通信技术股份有限公司 | The NFC antenna of a kind of mobile terminal and mobile terminal |
| CN106252836A (en) * | 2016-09-22 | 2016-12-21 | 青岛海信移动通信技术股份有限公司 | Terminal and the implementation method of NFC antenna thereof |
| CN206516765U (en) * | 2016-12-29 | 2017-09-22 | 昆山睿翔讯通通信技术有限公司 | NFC antenna circuit for all-metal frame wrist-watch |
-
2016
- 2016-12-29 CN CN201611247636.1A patent/CN107069240B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965445A (en) * | 2004-05-18 | 2007-05-16 | 松下电器产业株式会社 | Antenna assembly and wireless unit employing it |
| US7378851B1 (en) * | 2006-12-11 | 2008-05-27 | General Electric Company | Integrated low noise amplifier and balun for MRI receivers |
| CN105446127A (en) * | 2015-12-25 | 2016-03-30 | 惠州硕贝德无线科技股份有限公司 | Wearable device with near-field communication function |
| CN106207442A (en) * | 2016-06-29 | 2016-12-07 | 青岛海信移动通信技术股份有限公司 | The NFC antenna of a kind of mobile terminal and mobile terminal |
| CN106252836A (en) * | 2016-09-22 | 2016-12-21 | 青岛海信移动通信技术股份有限公司 | Terminal and the implementation method of NFC antenna thereof |
| CN206516765U (en) * | 2016-12-29 | 2017-09-22 | 昆山睿翔讯通通信技术有限公司 | NFC antenna circuit for all-metal frame wrist-watch |
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| CN107069240A (en) | 2017-08-18 |
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Country or region after: China Address after: 215300 Room 009, No. 55, Shengchuang Road, Yushan Town, Kunshan, Suzhou, Jiangsu Province Applicant after: KUNSHAN RUIXIANG XUNTONG COMMUNICATION TECHNOLOGY Co.,Ltd. Applicant after: KUNSHAN INNOVATION RESEARCH INSTITUTE OF XIDIAN University Address before: 215300 No.268 Dengyun Road, high tech Zone, Kunshan City, Suzhou City, Jiangsu Province Applicant before: KUNSHAN RUIXIANG XUNTONG COMMUNICATION TECHNOLOGY Co.,Ltd. Country or region before: China Applicant before: KUNSHAN INNOVATION RESEARCH INSTITUTE OF XIDIAN University |
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