CN216982098U - Antenna switching circuit and wireless earphone audio frequency transmitting device - Google Patents
Antenna switching circuit and wireless earphone audio frequency transmitting device Download PDFInfo
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- CN216982098U CN216982098U CN202220567488.6U CN202220567488U CN216982098U CN 216982098 U CN216982098 U CN 216982098U CN 202220567488 U CN202220567488 U CN 202220567488U CN 216982098 U CN216982098 U CN 216982098U
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Abstract
The application provides an antenna switching circuit and a wireless earphone audio transmitting device. The antenna switching circuit comprises an antenna switcher, a first antenna circuit and a second antenna circuit; the first antenna circuit comprises an on-board antenna and a first frequency-selecting capacitor, a first signal output end of the antenna switcher is connected with a first end of the first frequency-selecting capacitor, and a second end of the first frequency-selecting capacitor is connected with the on-board antenna; the second antenna circuit comprises a ceramic antenna and a second frequency-selecting capacitor, a second signal output end of the antenna switcher is connected with a first end of the second frequency-selecting capacitor, and a second end of the second frequency-selecting capacitor is connected with the ceramic antenna. Under the switching of the antenna switcher, the corresponding antenna is selected to communicate with the wireless earphone, so that the antenna with strong antenna signal can be conveniently selected to communicate, the wireless communication strength between the antenna switching circuit and the wireless earphone is ensured, and the wireless transmission distance between the antenna switching circuit and the wireless earphone is effectively increased.
Description
Technical Field
The present invention relates to the field of wireless headset technologies, and in particular, to an antenna switching circuit and a wireless headset audio transmitter.
Background
With the development of technology, wireless headsets have shown absolute advantages over wired headsets, especially fast-growing wireless headsets in recent years, which use ICs under non-standard protocols with significantly lower latency performance than conventional bluetooth headsets.
However, the conventional non-standard protocol wireless headset is limited by the directivity of the wireless communication antenna, and the situation that the wireless transmission delay and the external interference resistance cannot be met simultaneously exists, under the condition of low delay, when a user plays a game or watches network video, the phenomenon that the sound is inconsistent with the picture is easy to occur, the sound transmission always lags behind the transmission of the video picture obviously, and the wireless transmission capability is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides an antenna switching circuit and a wireless earphone audio transmitting device which can effectively improve the wireless transmission distance.
The purpose of the utility model is realized by the following technical scheme:
an antenna switching circuit, comprising: an antenna switch, a first antenna circuit and a second antenna circuit; the control end of the antenna switcher is used for being connected with the output end of the antenna central controller, and the antenna switcher is used for receiving the antenna switching signal output by the antenna central controller so as to switch the signal output end corresponding to the antenna switcher; the first antenna circuit comprises an on-board antenna and a first frequency-selecting capacitor, a first signal output end of the antenna switcher is connected with a first end of the first frequency-selecting capacitor, a second end of the first frequency-selecting capacitor is connected with the on-board antenna, and the on-board antenna is used for being in communication connection with a wireless earphone; the second antenna circuit comprises a ceramic antenna and a second frequency-selecting capacitor, a second signal output end of the antenna switcher is connected with a first end of the second frequency-selecting capacitor, a second end of the second frequency-selecting capacitor is connected with the ceramic antenna, and the ceramic antenna is used for being in communication connection with the wireless earphone.
In one embodiment, the antenna switching circuit further includes a wireless output amplifier, the wireless output amplifier is connected to the amplification control terminal of the antenna switch, and the wireless output amplifier is configured to amplify the output power of the antenna switch.
In one embodiment, the first antenna circuit further includes a first filter capacitor, a second terminal of the first frequency-selective capacitor is connected to a first terminal of the first filter capacitor, and a second terminal of the first filter capacitor is grounded.
In one embodiment, the first antenna circuit further includes a third frequency-selecting capacitor, a first end of the first filter capacitor is connected to a first end of the third frequency-selecting capacitor, and a second end of the third frequency-selecting capacitor is connected to the on-board antenna.
In one embodiment, the first antenna circuit further includes a second filter capacitor, a second terminal of the third frequency-selective capacitor is connected to a first terminal of the second filter capacitor, and a second terminal of the second filter capacitor is grounded.
In one embodiment, the second antenna circuit further includes a third filter capacitor, a second terminal of the second frequency-selecting capacitor is connected to a first terminal of the third filter capacitor, and a second terminal of the third filter capacitor is grounded.
In one embodiment, the second antenna circuit further includes a fourth frequency-selective capacitor, a first end of the third filter capacitor is connected to a first end of the fourth frequency-selective capacitor, and a second end of the fourth frequency-selective capacitor is connected to the ceramic antenna.
In one embodiment, the second antenna circuit further includes a fourth filter capacitor, a second terminal of the fourth frequency-selective capacitor is connected to a first terminal of the fourth filter capacitor, and a second terminal of the fourth filter capacitor is grounded.
In one embodiment, the on-board antenna and the ceramic antenna are disposed perpendicular to each other.
An audio transmitter of a wireless earphone comprises the antenna switching circuit in any of the above embodiments.
Compared with the prior art, the utility model has at least the following advantages:
under the switching of the antenna switcher, the corresponding antenna is selected to communicate with the wireless earphone, so that the antenna with strong antenna signal can be conveniently selected to communicate, the wireless communication strength between the antenna switching circuit and the wireless earphone is ensured, and the wireless transmission distance between the antenna switching circuit and the wireless earphone is effectively increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a circuit diagram of an antenna switching circuit according to an embodiment;
fig. 2 is a schematic diagram of a circuit board where the antenna switching circuit shown in fig. 1 is located.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The present invention relates to an antenna switching circuit. In one embodiment, the antenna switching circuit includes an antenna switch, a first antenna circuit, and a second antenna circuit. The control end of the antenna switcher is used for being connected with the output end of the antenna central controller, and the antenna switcher is used for receiving the antenna switching signal output by the antenna central controller so as to switch the signal output end corresponding to the antenna switcher. The first antenna circuit comprises an on-board antenna and a first frequency-selective capacitor. And a first signal output end of the antenna switcher is connected with a first end of the first frequency-selecting capacitor, and a second end of the first frequency-selecting capacitor is connected with the on-board antenna. The onboard antenna is used for being in communication connection with the wireless earphone. The second antenna circuit comprises a ceramic antenna and a second frequency-selecting capacitor. And a second signal output end of the antenna switcher is connected with a first end of the second frequency-selecting capacitor, a second end of the second frequency-selecting capacitor is connected with the ceramic antenna, and the ceramic antenna is used for being in communication connection with the wireless earphone. Under the switching of the antenna switcher, the corresponding antenna is selected to communicate with the wireless earphone, so that the antenna with strong antenna signal can be conveniently selected to communicate, the wireless communication strength between the antenna switching circuit and the wireless earphone is ensured, and the wireless transmission distance between the antenna switching circuit and the wireless earphone is effectively increased.
Please refer to fig. 1, which is a circuit diagram of an antenna switching circuit according to an embodiment of the present invention.
The antenna switching circuit 10 of an embodiment includes an antenna switch, a first antenna circuit 100, and a second antenna circuit 200. The control end of the antenna switch is used for being connected with the output end of the antenna central controller, and the antenna switch is used for receiving an antenna switching signal output by the antenna central controller so as to switch the signal output end corresponding to the antenna switch. The first antenna circuit 100 includes an on-board antenna ANT1 and a first frequency-selective capacitor C31. A first signal output end of the antenna switch is connected to a first end of the first frequency-selecting capacitor C31, and a second end of the first frequency-selecting capacitor C31 is connected to the on-board antenna ANT 1. The onboard antenna ANT1 is used to communicatively couple to a wireless headset. The second antenna circuit 200 includes a ceramic antenna ANT2 and a second frequency-selective capacitor C32. A second signal output end of the antenna switch is connected to a first end of the second frequency-selecting capacitor C32, a second end of the second frequency-selecting capacitor C32 is connected to the ceramic antenna ANT2, and the ceramic antenna ANT2 is used for being in communication connection with the wireless headset.
In this embodiment, under the switching of the antenna switch, the corresponding antenna is selected for communication with the wireless headset, so that the antenna with strong antenna signal can be conveniently selected for communication, and the wireless communication strength between the antenna switching circuit and the wireless headset is ensured, thereby effectively improving the wireless transmission distance between the antenna switching circuit and the wireless headset. The onboard antenna ANT1 and the ceramic antenna ANT2 are both arranged on a circuit board where the antenna switching circuit is located, and the performance of the antenna can be guaranteed as long as the clearance area of the antenna and the size requirement of the routing are guaranteed. Moreover, the on-board antenna ANT1 and the ceramic antenna ANT2 are located at the same level of the circuit board, so that the consistency state of the antenna process is stable, and the cost for separately processing the antenna is saved.
In one embodiment, referring to fig. 1, the antenna switching circuit 10 further includes a wireless output power amplifier PA, where the wireless output power amplifier PA is connected to the amplification control terminal of the antenna switch, and the wireless output power amplifier PA is used for amplifying the output power of the antenna switch. In this embodiment, the wireless output power amplifier PA is connected to the antenna switch, and the antenna switch is used as an output switch of the antenna signal, that is, the antenna switch switches a transmitting device of the antenna signal, that is, the antenna switch has a signal switching function, so that the antenna signal is conveniently transmitted by a corresponding antenna, and it is ensured that the antenna signal can be accurately received by the wireless headset. In the process of switching the antenna signal by the antenna switch, the wireless output power amplifier PA amplifies the antenna signal, that is, the wireless output power amplifier PA increases the output power of the antenna switch, that is, the wireless output power amplifier PA amplifies the power of the antenna signal, so that the power output of the antenna switching circuit is increased, and the wireless transmission distance of the antenna switching circuit is effectively increased.
In one embodiment, referring to fig. 1, the first antenna circuit 100 further includes a first filter capacitor C33, a second terminal of the first frequency-selecting capacitor C31 is connected to the first terminal of the first filter capacitor C33, and a second terminal of the first filter capacitor C33 is grounded. In this embodiment, a first end of the first filtering capacitor C33 is connected to a second end of the first frequency-selecting capacitor C31, and after the first frequency-selecting capacitor C31 performs frequency selection on the antenna signals output by the wireless output amplifier PA, the antenna signals with a specific frequency in the antenna signals are screened, so that the specified frequency signal at the first signal output end of the wireless output amplifier PA passes through. After the antenna signals are screened by the first frequency-selecting capacitor C31, the first filtering capacitor C33 filters the antenna signals passing through the first frequency-selecting capacitor C31, so that signals with a large frequency difference corresponding to the first frequency-selecting capacitor C31 in the antenna signals are filtered, high-order harmonics in the antenna signals are filtered, and the stability of the antenna signals transmitted by the on-board antenna ANT1 is effectively improved.
Further, the first antenna circuit 100 further includes a third frequency-selective capacitor C17, a first end of the first filter capacitor C33 is connected to a first end of the third frequency-selective capacitor C17, and a second end of the third frequency-selective capacitor C17 is connected to the on-board antenna ANT 1. In this embodiment, the both ends of third frequency-selecting capacitor C17 respectively with first frequency-selecting capacitor C31 and board-mounted antenna ANT1 connects, third frequency-selecting capacitor C17 is established ties first frequency-selecting capacitor C31 with between the board-mounted antenna ANT1, make first antenna circuit 100's equivalent frequency-selecting capacitor changes, and it is right to be convenient for carry out the secondary frequency selection to antenna signal, thereby be convenient for follow sieve out the antenna signal of the frequency that accords with actual demand more in the antenna signal, and then be convenient for improve the degree of accuracy of board-mounted antenna ANT1 transmission signal. In another embodiment, the capacitance value of the third frequency-selecting capacitor C17 is much smaller than that of the first frequency-selecting capacitor C31, for example, the capacitance value of the first frequency-selecting capacitor C31 is 100pf, and the capacitance value of the third frequency-selecting capacitor C17 is 1.2pf, so that two frequency selections are performed on the antenna signal, and thus a more precise frequency antenna signal is obtained.
Still further, the first antenna circuit 100 further includes a second filter capacitor C34, a second terminal of the third frequency-selecting capacitor C17 is connected to the first terminal of the second filter capacitor C34, and a second terminal of the second filter capacitor C34 is grounded. In this embodiment, the second filter capacitor C34 is located between the on-board antenna ANT1 and the third frequency-selecting capacitor C17, the second filter capacitor C34 performs secondary filtering on the antenna signal that passes through the frequency-selecting of the third frequency-selecting capacitor C17, and the second filter capacitor C34 performs secondary filtering on the antenna signal that finally passes through the antenna ANT1, so that the probability of the presence of noise in the antenna signal transmitted by the on-board antenna ANT1 is reduced, and the output stability of the first antenna circuit 100 is effectively improved.
In one embodiment, referring to fig. 1, the second antenna circuit 200 further includes a third filtering capacitor C35, a second terminal of the second frequency-selecting capacitor C32 is connected to the first terminal of the third filtering capacitor C35, and a second terminal of the third filtering capacitor C35 is grounded. In this embodiment, a first end of the third filtering capacitor C35 is connected to a second end of the second frequency-selecting capacitor C32, and after the second frequency-selecting capacitor C32 performs frequency selection on the antenna signal output by the wireless output amplifier PA, the antenna signal with a specific frequency in the antenna signal is screened, so that the specified frequency signal at the second signal output end of the wireless output amplifier PA passes through. After the antenna signals are screened by the second frequency-selecting capacitor C32, the antenna signals passing through the second frequency-selecting capacitor C32 are filtered by the third filtering capacitor C35, so that signals with a large frequency difference corresponding to the second frequency-selecting capacitor C32 in the antenna signals are filtered, high-order harmonics in the antenna signals are filtered, and the stability of the antenna signals transmitted by the ceramic antenna ANT2 is effectively improved.
Further, the second antenna circuit 200 further includes a fourth frequency-selecting capacitor C18, a first end of the third filtering capacitor C35 is connected to a first end of the fourth frequency-selecting capacitor C18, and a second end of the fourth frequency-selecting capacitor C18 is connected to the ceramic antenna ANT 2. In this embodiment, two ends of the fourth frequency-selecting capacitor C18 are respectively connected to the second frequency-selecting capacitor C32 and the ceramic antenna ANT2, and the fourth frequency-selecting capacitor C18 is connected in series between the second frequency-selecting capacitor C32 and the ceramic antenna ANT2, so that the equivalent frequency-selecting capacitor of the second antenna circuit 200 is changed, and secondary frequency selection is performed on the antenna signals, so that antenna signals with frequencies more meeting actual requirements are screened out from the antenna signals, and the accuracy of signal transmission by the ceramic antenna ANT2 is further improved. In another embodiment, the capacitance value of the fourth frequency-selecting capacitor C18 is much smaller than that of the second frequency-selecting capacitor C32, for example, the capacitance value of the second frequency-selecting capacitor C32 is 100pf, and the capacitance value of the fourth frequency-selecting capacitor C18 is 1.2pf, so that two frequency selections are performed on the antenna signal, and thus a more precise frequency antenna signal is obtained.
Still further, the second antenna circuit 200 further includes a fourth filtering capacitor C36, a second terminal of the fourth frequency-selecting capacitor C18 is connected to the first terminal of the fourth filtering capacitor C36, and a second terminal of the fourth filtering capacitor C36 is grounded. In this embodiment, the fourth filtering capacitor C36 is located between the ceramic antenna ANT2 and the fourth frequency-selecting capacitor C18, the fourth filtering capacitor C36 performs secondary filtering on the antenna signal that is frequency-selected by the fourth frequency-selecting capacitor C18, and the fourth filtering capacitor C36 performs secondary filtering on the antenna signal that is finally transmitted by the ceramic antenna ANT2, so that the probability of interference waves existing in the antenna signal transmitted by the ceramic antenna ANT2 is reduced, and the output stability of the second antenna circuit 200 is effectively improved.
In one embodiment, please refer to fig. 1 and 2 together, which are circuit board structures where the antenna switching circuit is located, and the on-board antenna ANT1 and the ceramic antenna ANT2 are disposed perpendicular to each other. In this embodiment, the position of the on-board antenna ANT1 on the circuit board is 300 in fig. 2, the position of the ceramic antenna ANT2 on the circuit board is 400 in fig. 2, the position of the antenna switch on the circuit board is 500 in fig. 2, and the position of the wireless output power amplifier PA on the circuit board is 600 in fig. 2. Onboard antenna ANT1 with ceramic antenna ANT2 all sets up on the circuit board, onboard antenna ANT1 with ceramic antenna ANT2 launches different antenna signal respectively, according to the transmission characteristic to antenna signal separately, is convenient for select suitable antenna and carries out signal transmission. Onboard antenna ANT1 with ceramic antenna ANT2 mutually perpendicular sets up, is coordinating antenna switch switches the switching of using to different antennas, optimizes the directionality of antenna effectively, is convenient for select suitable antenna according to the intensity of antenna signal. Because board-mounted antenna ANT1 with ceramic antenna ANT2 mutually perpendicular sets up, makes board-mounted antenna ANT1 with there is certain difference in height in ceramic antenna ANT 2's radiating plane, and signal difference not only between the complementary antenna is convenient for improve the directionality of antenna, can also promote the isolation between two antennas to reach and improve wireless transmission distance and interference killing feature. In another embodiment, the on-board antenna is embodied as an on-board PCB antenna, which is formed with the current core layer level when the circuit board is patterned. The ceramic antenna is arranged on the circuit board, namely the ceramic antenna can be directly attached to the circuit board, namely the ceramic antenna can be arranged on the circuit board in a sticking mode.
In one embodiment, the present application further provides a wireless headset audio transmitting device, including the antenna switching circuit described in any of the above embodiments. In this embodiment, the antenna switching circuit includes an antenna switch, a first antenna circuit and a second antenna circuit. The control end of the antenna switcher is used for being connected with the output end of the antenna central controller, and the antenna switcher is used for receiving the antenna switching signal output by the antenna central controller so as to switch the signal output end corresponding to the antenna switcher. The first antenna circuit comprises an on-board antenna and a first frequency-selective capacitor. And a first signal output end of the antenna switcher is connected with a first end of the first frequency-selecting capacitor, and a second end of the first frequency-selecting capacitor is connected with the on-board antenna. The onboard antenna is used for being in communication connection with the wireless earphone. The second antenna circuit comprises a ceramic antenna and a second frequency-selecting capacitor. And a second signal output end of the antenna switcher is connected with a first end of the second frequency-selecting capacitor, a second end of the second frequency-selecting capacitor is connected with the ceramic antenna, and the ceramic antenna is used for being in communication connection with the wireless earphone. Under the switching of the antenna switcher, the corresponding antenna is selected to communicate with the wireless earphone, so that the antenna with strong antenna signal can be conveniently selected to communicate, the wireless communication strength between the antenna switching circuit and the wireless earphone is ensured, and the wireless transmission distance between the antenna switching circuit and the wireless earphone is effectively increased.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. An antenna switching circuit, comprising:
the antenna switcher is used for receiving an antenna switching signal output by the antenna central controller so as to switch a signal output end corresponding to the antenna switcher;
the first antenna circuit comprises an on-board antenna and a first frequency-selecting capacitor, a first signal output end of the antenna switcher is connected with a first end of the first frequency-selecting capacitor, a second end of the first frequency-selecting capacitor is connected with the on-board antenna, and the on-board antenna is used for being in communication connection with a wireless earphone;
the second antenna circuit comprises a ceramic antenna and a second frequency-selecting capacitor, a second signal output end of the antenna switcher is connected with a first end of the second frequency-selecting capacitor, a second end of the second frequency-selecting capacitor is connected with the ceramic antenna, and the ceramic antenna is used for being in communication connection with the wireless earphone.
2. The antenna switching circuit of claim 1, further comprising a wireless output amplifier, the wireless output amplifier being connected to the amplification control terminal of the antenna switch, the wireless output amplifier being configured to amplify the output power of the antenna switch.
3. The antenna switching circuit according to claim 1, wherein the first antenna circuit further comprises a first filter capacitor, a second terminal of the first frequency-selecting capacitor is connected to a first terminal of the first filter capacitor, and a second terminal of the first filter capacitor is grounded.
4. The antenna switching circuit of claim 3 wherein said first antenna circuit further comprises a third frequency-selective capacitor, a first terminal of said first filter capacitor being connected to a first terminal of said third frequency-selective capacitor, a second terminal of said third frequency-selective capacitor being connected to said on-board antenna.
5. The antenna switching circuit according to claim 4, wherein the first antenna circuit further comprises a second filter capacitor, a second terminal of the third frequency-selecting capacitor is connected to a first terminal of the second filter capacitor, and a second terminal of the second filter capacitor is grounded.
6. The antenna switching circuit of claim 1 wherein the second antenna circuit further comprises a third filter capacitor, a second terminal of the second frequency-selective capacitor is connected to a first terminal of the third filter capacitor, and a second terminal of the third filter capacitor is connected to ground.
7. The antenna switching circuit of claim 6 wherein the second antenna circuit further comprises a fourth frequency-selective capacitor, a first terminal of the third filter capacitor being connected to a first terminal of the fourth frequency-selective capacitor, a second terminal of the fourth frequency-selective capacitor being connected to the ceramic antenna.
8. The antenna switching circuit of claim 7 wherein the second antenna circuit further comprises a fourth filter capacitor, a second terminal of the fourth frequency-selective capacitor being coupled to a first terminal of the fourth filter capacitor, and a second terminal of the fourth filter capacitor being coupled to ground.
9. The antenna switching circuit of claim 1 wherein said on-board antenna and said ceramic antenna are disposed perpendicular to each other.
10. A wireless headset audio transmission device comprising an antenna switching circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220567488.6U CN216982098U (en) | 2022-03-15 | 2022-03-15 | Antenna switching circuit and wireless earphone audio frequency transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220567488.6U CN216982098U (en) | 2022-03-15 | 2022-03-15 | Antenna switching circuit and wireless earphone audio frequency transmitting device |
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| Publication Number | Publication Date |
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| CN216982098U true CN216982098U (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220567488.6U Active CN216982098U (en) | 2022-03-15 | 2022-03-15 | Antenna switching circuit and wireless earphone audio frequency transmitting device |
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| CN (1) | CN216982098U (en) |
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- 2022-03-15 CN CN202220567488.6U patent/CN216982098U/en active Active
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