CN103079146A - Matching circuit for antenna of Bluetooth headset - Google Patents
Matching circuit for antenna of Bluetooth headset Download PDFInfo
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- CN103079146A CN103079146A CN2012105800589A CN201210580058A CN103079146A CN 103079146 A CN103079146 A CN 103079146A CN 2012105800589 A CN2012105800589 A CN 2012105800589A CN 201210580058 A CN201210580058 A CN 201210580058A CN 103079146 A CN103079146 A CN 103079146A
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- match circuit
- frequency band
- bluetooth
- antenna
- bluetooth earphone
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Abstract
The invention discloses a matching circuit for an antenna of a Bluetooth headset and relates to the technical field of an electronic communication product. The matching circuit comprises a frequency band matching circuit arranged between a CPU(central processing unit) chip and the Bluetooth antenna of the Bluetooth headset, wherein the frequency band matching circuit comprises at least two frequency band matching circuits connected in parallel and acting on different frequency bands, the matching circuit for the antenna of the Bluetooth headset also comprises changeover switches for independently switching on the frequency band matching circuits respectively according to the signal receiving frequency or signal transmitting frequency of the Bluetooth headset, and the changeover switches are also connected with the control output end of the CPU chip and switch on the frequency band matching circuits in the corresponding frequency bands according to a signal of the control output end. The matching circuit for the antenna of the Bluetooth headset solves the technical problem that a Bluetooth antenna with small bandwidth in the prior art cannot meet the requirement on Bluetooth bandwidth. With the matching circuit, the Bluetooth antenna with small bandwidth can be applicable to the whole Bluetooth frequency band, and the overall performance of the Bluetooth headset is improved.
Description
Technical field
The present invention relates to the telecommunications product technical field, particularly a kind of match circuit of bluetooth earphone antenna.
Background technology
Bluetooth earphone is applied in Bluetooth technology on the hands-free headsets exactly, allows the user can exempt impeding of electric wire, and comfortable ground is easily conversation in every way.Since bluetooth earphone comes out, be the good tool of Mobile Commerce family raising efficiency always, exactly because also this point, so that bluetooth earphone more and more obtains people's favor.Bluetooth earphone belongs to electronic product, comprise earphone cpu chip, Bluetooth antenna and be arranged at cpu chip and Bluetooth antenna between antenna-matching circuit.
Along with the progress of society, the continuous lifting of people's living standard, people not only satisfy on function the requirement of bluetooth earphone, also the outward appearance of bluetooth earphone have been proposed more and more high-level requirement, so that bluetooth earphone more and more is tending towards miniaturization.Because the profile of bluetooth earphone is more and smaller and more exquisite, so that the inner space of bluetooth earphone is just more and more less, the design space of leaving accordingly Bluetooth antenna for is just more and more less, because reducing of the non-metallic regions around the Bluetooth antenna causes the bandwidth of Bluetooth antenna to become very little.Existing bluetooth earphone all adopts a match circuit, and this is just so that the Bluetooth antenna of little bandwidth can't satisfy the bandwidth requirement of the 80MHz of bluetooth 2400MHz to 2480MHz.
Summary of the invention
Technical problem to be solved by this invention provides a kind of match circuit of bluetooth earphone antenna, and the match circuit of this bluetooth earphone antenna can be so that the Bluetooth antenna of little bandwidth satisfies the bandwidth requirement of bluetooth 80MHz.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of match circuit of bluetooth earphone antenna, comprise the cpu chip that is arranged on bluetooth earphone and the frequency band match circuit between the Bluetooth antenna, described frequency band match circuit comprises the frequency band match circuit that acts on different frequency range of at least two parallel connections, the match circuit of described bluetooth earphone antenna comprises that also for the diverter switch of connecting separately respectively each described frequency band match circuit according to the frequency of described bluetooth earphone reception or transmitted signal, described diverter switch also connects the control output end of described cpu chip and connects the described frequency band match circuit of corresponding band according to the signal of described control output end.
As a kind of execution mode, be provided with respectively described diverter switch between described cpu chip and each the described frequency band match circuit and between described Bluetooth antenna and each the described frequency band match circuit.
As another kind of execution mode, be provided with described diverter switch between described cpu chip and each the described frequency band match circuit.
As another execution mode, be provided with described diverter switch between described Bluetooth antenna and each the described frequency band match circuit.
Wherein, described diverter switch is radio frequency converting switch.
Wherein, described frequency band match circuit comprises the first frequency band match circuit and the second frequency band match circuit, and described the first frequency band match circuit and the second frequency band match circuit act on respectively in the 40MHz of different frequency range.
Beneficial effect of the present invention is: the match circuit of bluetooth earphone antenna of the present invention comprises the cpu chip that is arranged on bluetooth earphone and the frequency band match circuit between the Bluetooth antenna, the frequency band match circuit comprises the frequency band match circuit that acts on different frequency range of at least two parallel connections, the match circuit of bluetooth earphone antenna also comprises the diverter switch of solely leading to each frequency band match circuit for according to the frequency difference order of bluetooth earphone reception or transmitted signal, and diverter switch also connects the control output end of cpu chip and connects the frequency band match circuit of corresponding band according to the signal of control output end.Because match circuit comprises at least two diverter switches that act on the frequency band match circuit of different frequency range and be used for connecting each frequency band match circuit, diverter switch is controlled by cpu chip, when if the bandwidth of Bluetooth antenna is 40MHz, be provided with so the bandwidth requirement that two frequency band match circuit just can satisfy bluetooth 80MHz, the first frequency band match circuit function is in the 40MHz of 2400MHz to 2440MHz bandwidth, and the second frequency band match circuit function is in the 40MHz of 2440MHz to 2480MHz bandwidth; When if the bandwidth of Bluetooth antenna is 20MHz, be provided with so the bandwidth requirement that four frequency band match circuit just can satisfy bluetooth 80MHz, each frequency band match circuit acts on respectively in the different frequency range of 80MHz.During work, cpu chip receives according to bluetooth earphone or the frequency of transmitted signal is judged the working frequency range that belongs to which frequency band match circuit, then controls the frequency band match circuit that diverter switch is connected corresponding band.Therefore the present invention can so that the wide Bluetooth antenna of small band can be applicable to whole bluetooth frequency range, improve the overall performance of bluetooth earphone.
In sum, the match circuit of the bluetooth earphone antenna of the present invention Bluetooth antenna that solved the medium and small bandwidth of prior art can not satisfy the technical problem that bluetooth bandwidth requires.The match circuit of bluetooth earphone antenna of the present invention has improved the overall performance of bluetooth earphone so that the Bluetooth antenna of little bandwidth can be applicable to whole bluetooth frequency range.
Description of drawings
Fig. 1 is the structured flowchart of the match circuit embodiment one of bluetooth earphone antenna of the present invention;
Fig. 2 is the circuit theory diagrams of the match circuit embodiment one of bluetooth earphone antenna of the present invention;
Fig. 3 is the structured flowchart of the match circuit embodiment two of bluetooth earphone antenna of the present invention;
Fig. 4 is the structured flowchart of the match circuit embodiment three of bluetooth earphone antenna of the present invention;
Fig. 5 is the program flow diagram of the match circuit of bluetooth earphone antenna of the present invention.
Embodiment
Below in conjunction with drawings and Examples, further set forth the present invention.
Embodiment one:
As shown in Figure 1, a kind of match circuit of bluetooth earphone antenna, comprise the cpu chip that is arranged on bluetooth earphone and the frequency band match circuit between the Bluetooth antenna, the frequency band match circuit comprises the frequency band match circuit that acts on different frequency range of two parallel connections, the match circuit of bluetooth earphone antenna also comprises for the diverter switch of connecting separately respectively each described frequency band match circuit according to the frequency of bluetooth earphone reception or transmitted signal, diverter switch is provided with two, and one of them diverter switch is arranged between the cpu chip frequency band match circuit in parallel with two; Another diverter switch is arranged between the frequency band match circuit and Bluetooth antenna of two parallel connections.Diverter switch also connects the control output end of cpu chip and connects the frequency band match circuit of corresponding band according to the signal of control output end.Because match circuit comprises two diverter switches that act on the frequency band match circuit of different frequency range and be used for connecting each frequency band match circuit, diverter switch is controlled by cpu chip, the bandwidth of the Bluetooth antenna of the present embodiment is 40MHz, be provided with so the bandwidth requirement that two frequency band match circuit just can satisfy bluetooth 80MHz, the first frequency band match circuit function is in the 40MHz of 2400MHz to 2440MHz bandwidth, and the second frequency band match circuit function is in the 40MHz of 2440MHz to 2480MHz bandwidth.During work, cpu chip receives according to bluetooth earphone or the frequency of transmitted signal is judged the working frequency range that belongs to which frequency band match circuit, then controls the frequency band match circuit that diverter switch is connected corresponding band.Therefore the present invention can so that the wide Bluetooth antenna of small band can be applicable to whole bluetooth frequency range, improve the overall performance of bluetooth earphone.
As shown in Figure 2, the concrete connected mode of the match circuit of above-mentioned bluetooth earphone antenna is as follows: diverter switch is radio frequency converting switch.The radio frequency I/O end RF-IN/OUT of cpu chip connects the input of filter circuit BP FILTER, the output of filter circuit BP FILTER connects the RFC end of the first diverter switch RF SWITCH1, the VRF1 end of the first diverter switch RF SWITCH1 connects the first control output end PIO1 of cpu chip, the VRF2 end of the first diverter switch RF SWITCH1 connects the second control output end PIO2 of cpu chip, the RF1 end of the first diverter switch RF SWITCH1 connects an end of the first frequency band match circuit, and the other end of the first frequency band match circuit connects the RF1 end of the second diverter switch RF SWITCH2; The RF2 end of the first diverter switch RF SWITCH1 connects an end of the second frequency band match circuit, and the other end of the second frequency band match circuit connects the RF2 end of the second diverter switch RF SWITCH2; The VRF1 end of the second diverter switch RF SWITCH2 connects the first control output end PIO1 of cpu chip, the VRF2 end of the second diverter switch RF SWITCH2 connects the second control output end PIO2 of cpu chip, and the RFC end of the second diverter switch RF SWITCH2 connects Bluetooth antenna ANT.
Shown in Fig. 2 and Fig. 5 are common, further set forth the operation principle of the present embodiment below in conjunction with program circuit of the present invention, program circuit is as follows:
Flow process starts from going on foot 100, obtains the frequency hop sequences tabulation of bluetooth earphone in the step 100;
Divide the frequency range at the signal place of bluetooth earphone reception or transmission according to frequency hop sequences in the step 101;
Do you judge that in the step 102 the signal frequency range of bluetooth earphone reception or transmission is in the frequency range of the first frequency band match circuit function? if the result is "Yes", then enter the step 105; If the result is "No", then enter the step 103;
Determine that in the step 103 the signal frequency range of bluetooth earphone reception or transmission is in the frequency range of the second frequency band match circuit function;
Connect the second frequency band match circuit in steps 104 control diverter switch, that is: the second control output end PIO2 of cpu chip exports high level, connect respectively RFC and the RF2 end of the first diverter switch RF SWITCH1 and the second diverter switch RFSWITCH2, one termination of cpu chip and the second frequency band match circuit is logical, simultaneously the other end and the Bluetooth antenna of the second frequency band match circuit are connected;
Connect the first frequency band match circuit in steps 105 control diverter switch, that is: the first control output end PIO1 of cpu chip exports high level, connect respectively RFC and the RF1 end of the first diverter switch RF SWITCH1 and the second diverter switch RFSWITCH2, one termination of cpu chip and the first frequency band match circuit is logical, simultaneously the other end and the Bluetooth antenna of the first frequency band match circuit are connected.
Drawn by above-mentioned, the Bluetooth antenna that originally only has the 40MHz bandwidth, just can be operated in by the present invention in the whole bluetooth frequency range of 80MHz bandwidth, both satisfied the trend of bluetooth earphone miniaturization development, guaranteed again the service behaviour of bluetooth earphone, therefore improved on the whole the performance of bluetooth earphone.
Embodiment two:
As shown in Figure 3, the difference of the present embodiment and embodiment one is:
Only between the Bluetooth antenna frequency band match circuit in parallel with two, be provided with diverter switch, this designs simplification circuit, equally can be so that script only has the Bluetooth antenna of 40MHz bandwidth can be operated in the whole bluetooth frequency range of 80MHz bandwidth.
Embodiment three:
As shown in Figure 4, the difference of the present embodiment and embodiment one is:
Only between the cpu chip frequency band match circuit in parallel with two, be provided with diverter switch, this designs simplification circuit, equally can be so that script only has the Bluetooth antenna of 40MHz bandwidth can be operated in the whole bluetooth frequency range of 80MHz bandwidth.
The present invention is not limited to above-mentioned concrete execution mode, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within protection scope of the present invention.
Claims (6)
1. the match circuit of bluetooth earphone antenna, comprise the cpu chip that is arranged on bluetooth earphone and the frequency band match circuit between the Bluetooth antenna, it is characterized in that: described frequency band match circuit comprises the frequency band match circuit that acts on different frequency range of at least two parallel connections, the match circuit of described bluetooth earphone antenna comprises that also for the diverter switch of connecting separately respectively each described frequency band match circuit according to the frequency of described bluetooth earphone reception or transmitted signal, described diverter switch also connects the control output end of described cpu chip and connects the described frequency band match circuit of corresponding band according to the signal of described control output end.
2. the match circuit of bluetooth earphone antenna according to claim 1 is characterized in that: be provided with respectively described diverter switch between described cpu chip and each the described frequency band match circuit and between described Bluetooth antenna and each the described frequency band match circuit.
3. the match circuit of bluetooth earphone antenna according to claim 1 is characterized in that: be provided with described diverter switch between described cpu chip and each the described frequency band match circuit.
4. the match circuit of bluetooth earphone antenna according to claim 1 is characterized in that: be provided with described diverter switch between described Bluetooth antenna and each the described frequency band match circuit.
5. according to claim 1 to the match circuit of the described bluetooth earphone antenna of 4 each claims, it is characterized in that: described diverter switch is radio frequency converting switch.
6. the match circuit of bluetooth earphone antenna according to claim 5, it is characterized in that: described frequency band match circuit comprises the first frequency band match circuit and the second frequency band match circuit, and described the first frequency band match circuit and the second frequency band match circuit act on respectively in the 40MHz of different frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105800589A CN103079146A (en) | 2012-12-27 | 2012-12-27 | Matching circuit for antenna of Bluetooth headset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105800589A CN103079146A (en) | 2012-12-27 | 2012-12-27 | Matching circuit for antenna of Bluetooth headset |
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| CN103079146A true CN103079146A (en) | 2013-05-01 |
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| CN2012105800589A Pending CN103079146A (en) | 2012-12-27 | 2012-12-27 | Matching circuit for antenna of Bluetooth headset |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106331918A (en) * | 2015-06-23 | 2017-01-11 | 深圳市科奈信科技有限公司 | Bluetooth sports earphone without signal dead angle |
| CN106452514A (en) * | 2016-10-14 | 2017-02-22 | 歌尔科技有限公司 | Bluetooth headset |
| WO2018000507A1 (en) * | 2016-06-30 | 2018-01-04 | 宇龙计算机通信科技(深圳)有限公司 | Radio frequency transmitting circuit, control method, and mobile terminal |
| WO2019232940A1 (en) * | 2018-06-08 | 2019-12-12 | 易力声科技(深圳)有限公司 | Headset employing metal headband to transmit wireless signal |
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| CN101646030A (en) * | 2009-05-15 | 2010-02-10 | 上海闻泰电子科技有限公司 | Circuit designing method for extending antenna bandwidth of analogue television |
| CN102136847A (en) * | 2010-01-26 | 2011-07-27 | 宏达国际电子股份有限公司 | Wideband antenna matching device and method thereof |
| CN102637964A (en) * | 2012-04-28 | 2012-08-15 | 上海华勤通讯技术有限公司 | Antenna system and mobile terminal thereof |
| CN202998449U (en) * | 2012-12-27 | 2013-06-12 | 青岛歌尔声学科技有限公司 | Matched circuit for Bluetooth earphone antenna |
-
2012
- 2012-12-27 CN CN2012105800589A patent/CN103079146A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101646030A (en) * | 2009-05-15 | 2010-02-10 | 上海闻泰电子科技有限公司 | Circuit designing method for extending antenna bandwidth of analogue television |
| CN102136847A (en) * | 2010-01-26 | 2011-07-27 | 宏达国际电子股份有限公司 | Wideband antenna matching device and method thereof |
| CN102637964A (en) * | 2012-04-28 | 2012-08-15 | 上海华勤通讯技术有限公司 | Antenna system and mobile terminal thereof |
| CN202998449U (en) * | 2012-12-27 | 2013-06-12 | 青岛歌尔声学科技有限公司 | Matched circuit for Bluetooth earphone antenna |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106331918A (en) * | 2015-06-23 | 2017-01-11 | 深圳市科奈信科技有限公司 | Bluetooth sports earphone without signal dead angle |
| WO2018000507A1 (en) * | 2016-06-30 | 2018-01-04 | 宇龙计算机通信科技(深圳)有限公司 | Radio frequency transmitting circuit, control method, and mobile terminal |
| CN106452514A (en) * | 2016-10-14 | 2017-02-22 | 歌尔科技有限公司 | Bluetooth headset |
| CN106452514B (en) * | 2016-10-14 | 2019-04-12 | 歌尔科技有限公司 | A kind of bluetooth headset |
| WO2019232940A1 (en) * | 2018-06-08 | 2019-12-12 | 易力声科技(深圳)有限公司 | Headset employing metal headband to transmit wireless signal |
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Application publication date: 20130501 |