CN217824969U - Antenna switching circuit and electronic equipment - Google Patents
Antenna switching circuit and electronic equipment Download PDFInfo
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- CN217824969U CN217824969U CN202222236412.8U CN202222236412U CN217824969U CN 217824969 U CN217824969 U CN 217824969U CN 202222236412 U CN202222236412 U CN 202222236412U CN 217824969 U CN217824969 U CN 217824969U
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- 238000001514 detection method Methods 0.000 claims abstract description 31
- 238000003780 insertion Methods 0.000 claims abstract description 24
- 230000037431 insertion Effects 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000015556 catabolic process Effects 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
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- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model discloses an antenna switching circuit, which comprises an internal antenna, a radio frequency interface circuit for inserting and connecting the external antenna, a microprocessor, an antenna switching circuit and an antenna insertion detection circuit, wherein the antenna insertion detection circuit is respectively connected with the radio frequency interface circuit and the microprocessor so as to send a corresponding level signal to the microprocessor according to whether the external antenna is inserted or not; the input end of the antenna switching switch circuit is connected with the GPIO signal output end of the microprocessor, and the two output ends of the antenna switching switch circuit are respectively connected with the built-in antenna and the radio frequency interface circuit. The utility model relates to an antenna switching circuit replaces logic circuit control through microprocessor cooperation antenna change over switch circuit, realizes the arbitrary switching between built-in antenna or the external antenna, solves the problem that the external antenna that logic circuit control leads to is inserted the back and is forced the use and the user can't switch back built-in antenna by oneself. The utility model also provides an electronic equipment including this antenna switching circuit.
Description
Technical Field
The utility model relates to a wireless communication technology field especially relates to an antenna switching circuit and electronic equipment.
Background
The antenna is arranged on the wireless communication equipment, which is a basic structure for realizing wireless communication, most of the antennas in the wireless communication equipment are built-in antennas, but the built-in antennas have poor gain, isolation and directivity, so that the wireless communication equipment can be connected with the external antennas through the radio frequency interface circuit to improve the indexes of the antenna, such as gain, isolation, directivity and the like. However, due to the limitation of the logic circuit, after the external antenna is inserted, the external antenna is forcibly used, so that a user cannot switch back to the internal antenna by himself, the use scene is limited, and the logic circuit has many electronic elements and complex circuits, which is not favorable for the requirement of product miniaturization.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an antenna switching circuit and electronic equipment still can switch to use built-in antenna after realizing external antenna and inserting is provided, and simple structure is favorable to the demand of product miniaturization.
In a first aspect, an embodiment of the present invention provides an antenna switching circuit, which includes an internal antenna, a radio frequency interface circuit, a microprocessor, an antenna switching circuit, and an antenna insertion detection circuit, where the radio frequency interface circuit is used for an external antenna to be inserted and connected; the antenna insertion detection circuit is respectively connected with the radio frequency interface circuit and the microprocessor so as to send a corresponding level signal to the microprocessor according to whether the external antenna is inserted or not; the GPIO signal output end of the microprocessor is connected with the input end of the antenna switching switch circuit, and the two output ends of the antenna switching switch circuit are respectively connected with the built-in antenna and the radio frequency interface circuit so as to respectively control the built-in antenna or the external antenna connected with the radio frequency interface circuit.
The further technical scheme is as follows: the antenna switching circuit comprises an RF switch chip, a direct current control voltage pin of the RF switch chip is connected with the GPIO signal output end, a radio frequency public pin of the RF switch chip is used as an antenna signal input end, an antenna signal end of the microprocessor is connected with the radio frequency public pin through a third capacitor, and a first radio frequency channel pin and a second radio frequency channel pin of the RF switch chip are used as radio frequency signal output ends and are respectively connected with the built-in antenna and the radio frequency interface circuit.
The further technical scheme is as follows: and a working power supply pin of the RF switch chip is connected with a voltage source through a third resistor, and a fourth resistor with one end grounded is connected between the third resistor and the working power supply pin of the RF switch chip.
The further technical scheme is as follows: the model of the RF switch chip is RFASWA630BTF09.
The further technical scheme is as follows: the antenna insertion detection circuit comprises a fifth resistor, a first triode, a first diode and a sixth resistor, wherein the anode of the first diode is connected with the radio frequency interface circuit, the anode of the first diode is connected with the radio frequency interface circuit through the sixth resistor and then connected with a voltage source, the cathode of the first diode is connected with the base electrode of the first triode, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with the voltage source through the fifth resistor, and the microprocessor is connected between the collecting electrode of the first triode and the fifth resistor.
The further technical scheme is as follows: the radio frequency interface circuit comprises an SMA joint, a radio frequency input pin of the SMA joint is connected with one output end of the antenna change-over switch circuit, all ground ends of the SMA joint are connected with a grounding capacitor, one ground end of the SMA joint is connected with the antenna insertion detection circuit after passing through a seventh resistor, and a bidirectional breakdown diode with one end grounded is connected between the ground end connected with the seventh resistor and the seventh resistor.
The further technical scheme is as follows: the built-in antenna is connected with the antenna change-over switch circuit through an IPEX interface.
The further technical scheme is as follows: and two output ends of the antenna changeover switch circuit are respectively connected with the built-in antenna and the radio frequency interface circuit after passing through the impedance matching circuit.
The further technical scheme is as follows: the impedance matching circuit comprises a connecting resistor, two ends of the connecting resistor are respectively connected with a grounding capacitor, and two ends of the connecting resistor are respectively used as an input end and an output end of the impedance matching circuit.
In a second aspect, the embodiment of the present invention further provides an electronic device, including a housing and the antenna switching circuit, the antenna switching circuit is disposed in the housing.
The utility model has the advantages of: the utility model relates to an antenna switching circuit, which is provided with an antenna insertion detection circuit respectively connected with a radio frequency interface circuit and a microprocessor, so as to send a corresponding level signal to the microprocessor according to whether an external antenna is inserted or not, and prepare for antenna switching; the antenna switching circuit is controlled to work by utilizing a GPIO signal output end of a micro processor connected with an input end of the antenna switching circuit to send corresponding GPIO signals so as to respectively control the work of an internal antenna or an external antenna connected with a radio frequency interface circuit, the random switching between the internal antenna or the external antenna is realized, the micro processor is matched with the antenna switching circuit to replace the traditional logic circuit control, the problem that the external antenna is forcibly used after being inserted and the user can not switch back the internal antenna by self due to the traditional logic circuit control is solved, and the problems that the circuit is complex and the occupied volume is large due to the fact that electronic elements of the traditional logic circuit are numerous are avoided. The utility model provides an electronic equipment also has above-mentioned function.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a circuit block diagram of a specific application of an antenna switching circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of the antenna switching circuit according to the embodiment of the present invention after the microprocessor and the internal antenna are omitted.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, fig. 1 is a circuit block diagram of a specific application of an antenna switching circuit provided by an embodiment of the present invention, where the antenna switching circuit 10 includes an internal antenna 1, a radio frequency interface circuit 2, a microprocessor 3, an antenna switching circuit 4, and an antenna insertion detection circuit 5, and the radio frequency interface circuit 2 is used for an external antenna 6 to be inserted and connected; the antenna insertion detection circuit 5 is respectively connected with the radio frequency interface circuit 2 and the microprocessor 3, so as to send a corresponding level signal to the microprocessor 3 according to whether the external antenna 6 is inserted or not; the GPIO signal output end of the microprocessor 3 is connected with the antenna change-over switch circuit 4, and two output ends of the antenna change-over switch circuit 4 are respectively connected with the internal antenna 1 and the radio frequency interface circuit 2 so as to respectively control the internal antenna 1 or the external antenna 6 connected with the radio frequency interface circuit 2.
In an initial situation, after the external antenna 6 is connected with the radio frequency interface circuit 2, the internal inductance of the external antenna 6 and the radio frequency interface circuit 2 are shorted to the ground, at this time, a detection output signal of the antenna insertion detection circuit 5 is changed in level due to the insertion of the external antenna 6, and the microprocessor 3 detects that the detection output signal of the antenna insertion detection circuit 5 is changed from low level to high level, and then the microprocessor 3 sends a first GPIO signal for controlling the conduction of the output end of the antenna changeover switch circuit 4 connected with the radio frequency interface circuit 2 to the antenna changeover switch circuit 4, so that the antenna signal is transmitted through the external antenna 6 connected with the radio frequency interface circuit 2; when the external antenna 6 is not connected, the microprocessor 3 detects that the detection output signal of the antenna insertion detection circuit 5 is at a low level, and then the microprocessor 3 sends a second GPIO signal for controlling the conduction of the output end of the antenna changeover switch circuit 4 connected with the internal antenna 1 to the antenna changeover switch circuit 4, so that the antenna signal is transmitted through the internal antenna 1. After the external antenna 6 is connected with the radio frequency interface circuit 2, when the internal antenna 1 needs to be switched to work, a user can send a second GPIO signal used for controlling the conduction of the output end of the antenna switching circuit 4 connected with the internal antenna 1 to the antenna switching circuit 4 through the control micro-processor 3 so as to directly control the switching of the antenna, and the operation is convenient and simple. The antenna switching circuit 10 is provided with an antenna insertion detection circuit 5 respectively connected with the radio frequency interface circuit 2 and the microprocessor 3, so as to send a corresponding level signal to the microprocessor 3 according to whether the external antenna 6 is inserted or not, so as to prepare for antenna switching; the antenna switching circuit 4 is controlled to work by utilizing a GPIO signal output end of the micro-processor 3 connected with an input end of the antenna switching circuit 4 to respectively control the work of the internal antenna 1 or the external antenna 6 connected with the radio frequency interface circuit 2, so that the random switching between the internal antenna 1 or the external antenna 6 is realized, the micro-processor 3 is matched with the antenna switching circuit 4 to replace the traditional logic circuit control, the problem that the external antenna 6 is forcibly used after being inserted into the external antenna 6 and the user can not switch back to the internal antenna 1 by self due to the traditional logic circuit control is solved, the problems that the circuit is complex and the occupied size is large due to the numerous traditional logic circuit electronic elements are avoided, the requirement on product miniaturization is facilitated, and the production cost is low.
Referring to fig. 2, fig. 2 is a schematic diagram of an antenna switching circuit provided in an embodiment of the present invention after a microprocessor and a built-in antenna are omitted, the antenna switching circuit 4 includes an RF switch chip U1, and a dc control voltage pin V of the RF switch chip U1 CTL The antenna SIGNAL end ANT _ SIGNAL of the microprocessor is connected with the radio frequency common pin RFC through a third capacitor C3, and a first radio frequency channel pin RF1 and a second radio frequency channel pin RF2 of the RF switch chip U1 are used as radio frequency SIGNAL output ends and are respectively connected with the built-in antenna and the radio frequency interface circuit 2. Preferably, the RF switch chip U1 is model number RFASWA630BTF09. And a working power supply pin of the RF switch chip U1 is connected with a voltage source VDD through a third resistor R3, and a fourth resistor R4 with one end grounded is connected between the third resistor R3 and the working power supply pin of the RF switch chip U1.
Specifically, two output ends of the antenna changeover switch circuit 4 are respectively connected to the internal antenna and the radio frequency interface circuit 2 through impedance matching circuits. The two impedance matching circuits are a first matching impedance circuit 71 and a second matching impedance circuit 72, that is, the first radio frequency channel pin RF1 of the RF switch chip U1 is connected to the internal antenna through the first matching impedance circuit 71, and the second radio frequency channel pin RF2 of the RF switch chip U1 is connected to the radio frequency interface circuit 2 through the second matching impedance circuit 72, so as to control the internal antenna or the external antenna connected to the radio frequency interface circuit 2, respectively.
Specifically, the impedance matching circuit includes a connecting resistor, two ends of the connecting resistor are respectively connected to the ground capacitors, and two ends of the connecting resistor are respectively used as an input end and an output end of the impedance matching circuit. Accordingly, the first impedance matching circuit 71 includes a first connection resistor R1 and two grounded capacitors C1 and C2 connected to both ends of the first connection resistor R1, respectively, and both ends of the first connection resistor R1 are used as an input terminal and an output terminal of the first impedance matching circuit 71, respectively, to be connected to the first RF channel pin RF1 of the RF switch chip U1 and the internal antenna, respectively. Correspondingly, the second impedance matching circuit 72 includes a second connecting resistor R2 and two grounding capacitors respectively connected to two ends of the second connecting resistor R2, where the two grounding capacitors are respectively C4 and C5, and two ends of the second connecting resistor R2 are respectively used as an input end and an output end of the second impedance matching circuit 72 to be respectively connected to the second RF channel pin RF2 and the RF interface circuit 2 of the RF switch chip U1.
Specifically, the internal antenna is connected to the antenna changeover switch circuit 4 through the IPEX interface J1, two ends of the first connection resistor R1 are respectively connected to the first radio frequency channel pin RF1 of the RF switch chip U1 and the first pin of the IPEX interface J1, and the second pin and the third pin of the IPEX interface J1 are both grounded.
Specifically, the radio frequency interface circuit 2 includes an SMA connector J2, a radio frequency input pin RF of the SMA connector J2 is connected to one of output terminals of the antenna changeover switch circuit 4, all ground terminals of the SMA connector J2 are connected to a grounded capacitor, one of the ground terminals of the SMA connector J2 is connected to the antenna insertion detection circuit 5 through a seventh resistor R7, and a bidirectional breakdown diode D2 having one grounded terminal is connected between the ground terminal connected to the seventh resistor R7 and the seventh resistor R7. The diac D2 is used to suppress transient overvoltage. When surge pulse voltage appears in the protected circuit instantly, the two-way breakdown diode D2 can rapidly break down Zener and change from a high-resistance state to a low-resistance state to shunt and clamp the surge voltage, so that all elements in the protected circuit are protected from being damaged by the instant surge pulse voltage. Preferably, the radio frequency input pin RF of the SMA joint J2 is connected to the second radio frequency channel pin RF2 of the RF switch chip U1, and the SMA joint J2 may have four ground terminals, which are all connected to a ground capacitor, where the four ground capacitors are C6, C7, C8, and C9, respectively.
Specifically, the antenna insertion detection circuit 5 includes a fifth resistor R5, a first triode Q1, a first diode D1 and a sixth resistor R6, the anode of the first diode D1 is connected to the radio frequency interface circuit 2 via the sixth resistor R6 and then to the voltage source VDD, the cathode of the first diode D1 is connected to the base of the first triode Q1, the emitter of the first triode Q1 is grounded, the collector of the first triode Q1 is connected to the voltage source VDD via the fifth resistor R5, and the microprocessor is connected between the collector of the first triode Q1 and the fifth resistor R5 to receive a detection output signal obtained by detection whether the external antenna is inserted or not. The anode of the first diode D1 is connected to the seventh resistor R7. The collector of the first transistor Q1 is the output terminal OUT of the antenna insertion detection circuit 5 to output a detection output signal for detecting whether the external antenna is inserted.
Under the initial condition, when the external antenna is not connected, the base of the first triode Q1 is pulled up to a voltage source VDD through the sixth resistor R6, the base of the first triode Q1 is at a high level, the first triode Q1 is in a conducting state, at the moment, a detection output signal of the antenna insertion detection circuit 5 received by the micro processor is at a low level, and then the GPIO signal output end MCU _ GPIO of the micro processor sends a second GPIO signal used for controlling the conduction of a first radio frequency channel pin RF1 of an RF switch chip U1 connected with the internal antenna to a direct current control voltage pin V of the RF switch chip U1 CTL So that the radio frequency common pin RFC of the RF switch chip U1 is communicated with the first pin of the IPEX interface J1 after being conducted with the first radio frequency channel pin RF1, and is slightly communicated with the first pin of the IPEX interface J1An antenna SIGNAL sent by an antenna SIGNAL terminal ANT _ SIGNAL of the type processor passes through a radio frequency public pin RFC of an RF switch chip U1 and then is transmitted by a built-in antenna connected with an IPEX interface J1 through a first radio frequency channel pin RF 1. The second GPIO signal is high. When the external antenna is connected with the radio frequency interface circuit 2, the internal inductor of the external antenna is in short circuit with the SMA interface J2 to the ground, the base electrode of the first triode Q1 is in a cut-off state due to the short circuit of the SMA interface J2 to the ground, at the moment, a detection output signal of the antenna insertion detection circuit 5 received by the microprocessor is in a high level, and the GPIO signal output end MCU _ GPIO of the microprocessor sends a first GPIO signal for controlling the conduction of the second radio frequency channel pin RF2 of the RF switch chip U1 connected with the SMA interface J2 to the direct current control voltage pin V of the RF switch chip U1 CTL And an antenna SIGNAL sent by an antenna SIGNAL end ANT _ SIGNAL of the microprocessor passes through the radio frequency common pin RFC of the RF switch chip U1 and then is transmitted by an external antenna connected with the SMA interface J2 through the second radio frequency channel pin RF 2. The first GPIO signal is low. After the external antenna is connected with the radio frequency interface circuit 2, when the internal antenna needs to be switched to work, a user can send a second GPIO signal for controlling the conduction of a first radio frequency channel pin RF1 of an RF switch chip U1 connected with the internal antenna to a direct current control voltage pin V of the RF switch chip U1 through a GPIO signal output end MCU _ GPIO of the control micro-processor CTL The antenna switching is directly controlled, and the operation is convenient and simple.
The embodiment of the utility model provides an electronic equipment is still provided, including casing and foretell antenna switching circuit, antenna switching circuit locates in the casing.
To sum up, the antenna switching circuit of the present invention is provided with the antenna insertion detection circuit respectively connected to the radio frequency interface circuit and the microprocessor, so as to send a corresponding level signal to the microprocessor according to whether the external antenna is inserted or not, so as to prepare for antenna switching; utilize the GPIO signal output end of the microprocessor that links to each other with the input of antenna change-over switch circuit to send the work of corresponding GPIO signal control antenna change-over switch circuit in order to control built-in antenna or the external antenna work of being connected with radio frequency interface circuit respectively, realize the arbitrary switching between built-in antenna or the external antenna, replace traditional logic circuit control through microprocessor cooperation antenna change-over switch circuit, the problem that the external antenna of compulsory use after solving traditional logic circuit control and leading to inserts the external antenna and the user can't switch back built-in antenna again by oneself is solved, and avoid because the complicated and bulky problem that occupies of circuit that traditional logic circuit electronic component leads to because numerous, simple structure, small, the demand that is favorable to the product miniaturization. The utility model provides an electronic equipment also has above-mentioned function.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An antenna switching circuit is characterized by comprising an internal antenna, a radio frequency interface circuit, a microprocessor, an antenna switching switch circuit and an antenna insertion detection circuit, wherein the radio frequency interface circuit is used for inserting and connecting an external antenna; the antenna insertion detection circuit is respectively connected with the radio frequency interface circuit and the microprocessor so as to send a corresponding level signal to the microprocessor according to whether the external antenna is inserted or not; the GPIO signal output end of the microprocessor is connected with the antenna switching switch circuit, and two output ends of the antenna switching switch circuit are respectively connected with the built-in antenna and the radio frequency interface circuit so as to respectively control the built-in antenna or the external antenna connected with the radio frequency interface circuit.
2. The antenna switching circuit according to claim 1, wherein the antenna switching circuit comprises an RF switch chip, the dc control voltage pin of the RF switch chip is connected to the GPIO signal output terminal, the RF common pin of the RF switch chip is used as an antenna signal input terminal, the antenna signal terminal of the microprocessor is connected to the RF common pin through a third capacitor, and the first RF channel pin and the second RF channel pin of the RF switch chip are used as RF signal output terminals and are respectively connected to the internal antenna and the RF interface circuit.
3. The antenna switching circuit according to claim 2, wherein the operating power supply pin of the RF switch chip is connected to a voltage source through a third resistor, and a fourth resistor having one end grounded is connected between the third resistor and the operating power supply pin of the RF switch chip.
4. The antenna switching circuit of claim 2 wherein said RF switch chip is of the type RFASWA630BTF09.
5. The antenna switching circuit according to claim 1, wherein the antenna insertion detection circuit comprises a fifth resistor, a first triode, a first diode and a sixth resistor, an anode of the first diode is connected to the rf interface circuit, an anode of the first diode and the rf interface circuit are connected to a voltage source through the sixth resistor, a cathode of the first diode is connected to a base of the first triode, an emitter of the first triode is grounded, a collector of the first triode is connected to the voltage source through the fifth resistor, and the microprocessor is connected between a collector of the first triode and the fifth resistor.
6. The antenna switching circuit according to claim 1, wherein the radio frequency interface circuit includes an SMA contact, a radio frequency input pin of the SMA contact is connected to one of the output terminals of the antenna switching circuit, all ground terminals of the SMA contact are connected to a ground capacitor, one of the ground terminals of the SMA contact is connected to the antenna insertion detection circuit through a seventh resistor, and a bidirectional breakdown diode having one end grounded is connected between the ground terminal connected to the seventh resistor and the seventh resistor.
7. The antenna switching circuit according to claim 1, wherein the internal antenna is connected to the antenna switching circuit through an IPEX interface.
8. The antenna switching circuit according to claim 1, wherein two output terminals of the antenna switching circuit are connected to the internal antenna and the radio frequency interface circuit through impedance matching circuits, respectively.
9. The antenna switching circuit according to claim 8, wherein the impedance matching circuit comprises a connecting resistor, two ends of the connecting resistor are respectively connected to a grounded capacitor, and two ends of the connecting resistor are respectively used as an input end and an output end of the impedance matching circuit.
10. An electronic device comprising a housing and the antenna switching circuit of any of claims 1-9, the antenna switching circuit disposed within the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222236412.8U CN217824969U (en) | 2022-08-24 | 2022-08-24 | Antenna switching circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222236412.8U CN217824969U (en) | 2022-08-24 | 2022-08-24 | Antenna switching circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217824969U true CN217824969U (en) | 2022-11-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222236412.8U Active CN217824969U (en) | 2022-08-24 | 2022-08-24 | Antenna switching circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217824969U (en) |
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2022
- 2022-08-24 CN CN202222236412.8U patent/CN217824969U/en active Active
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Address after: 510000 room 1301, No. 37, Jinlong street, Xiangjiang financial and business center, Nansha District, Guangzhou City, Guangdong Province (office only) Patentee after: Guangzhou Tongze Kangwei Technology Co.,Ltd. Address before: 510000 room 1301, No. 37, Jinlong street, Xiangjiang financial and business center, Nansha District, Guangzhou City, Guangdong Province (office only) Patentee before: Guangzhou Tongze Kangwei Intelligent Technology Co.,Ltd. |