CN212627866U - Dual radio frequency output circuit - Google Patents
Dual radio frequency output circuit Download PDFInfo
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- CN212627866U CN212627866U CN202020785994.3U CN202020785994U CN212627866U CN 212627866 U CN212627866 U CN 212627866U CN 202020785994 U CN202020785994 U CN 202020785994U CN 212627866 U CN212627866 U CN 212627866U
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Abstract
The embodiment of the utility model discloses two radio frequency output circuit, include: a first switch circuit for outputting a first level signal or a second level signal according to a selection; the control circuit is connected with the first switch circuit and is used for outputting a first selection signal and a first radio frequency signal according to a first level signal or outputting a second selection signal and a second radio frequency signal according to a second level signal; and the second switch circuit is connected with the control circuit and is used for controlling the first radio-frequency signal to be output to the first output end according to the first selection signal or controlling the second radio-frequency signal to be output to the second output end according to the second selection signal. The utility model discloses a pass through single radio frequency output circuit and upgrade to double radio frequency output circuit through radio frequency switch to use on NB-IoT thing networking, realized that the application scene is more nimble, satisfy the customer demand under the prerequisite that does not change circuit design, reduce certain hardware cost, and can popularize and apply.
Description
Technical Field
The embodiment of the utility model provides a relate to the radio frequency output technology, especially relate to a dual radio frequency output circuit.
Background
The industrial internet of things equipment generally adopts a single radio frequency output circuit: the radio frequency output is externally connected with an antenna or internally provided with an antenna, thereby realizing wireless communication data transmission. However, the single rf output circuit has more disadvantages: it is not flexible enough in application scenarios, for example: under certain application scenes needing to consider water resistance or lightning protection, the external antenna brings certain potential safety hazard and cannot meet the requirements of the current application scenes on the premise of not changing the circuit design; meanwhile, in the range with better coverage of the NB-IoT network, if the radio frequency output external antenna is used uniformly, the corresponding material cost is increased, and if the radio frequency output internal antenna is used uniformly, the requirement of wireless data transmission in the area with poorer network coverage cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model provides a dual radio frequency output circuit to the realization switches the output demand according to the demand, include: a first switch circuit for outputting a first level signal or a second level signal according to a selection;
the control circuit is connected with the first switch circuit and is used for outputting a first selection signal and a first radio frequency signal according to the first level signal or outputting a second selection signal and a second radio frequency signal according to the second level signal;
and the second switch circuit is connected with the control circuit and is used for controlling the first radio-frequency signal to be output to the first output end according to the first selection signal or controlling the second radio-frequency signal to be output to the second output end according to the second selection signal.
Optionally, the first switching circuit includes: the circuit comprises a chip U3, a resistor R1, a resistor R2 and a voltage output end V1, wherein a first end of the resistor R1 is connected to a 3 rd pin of the chip U3, a second end of the resistor R1 is connected to the voltage output end V1, a first end of the resistor R2 is connected to a 1 st pin of the chip U3, a second end of the resistor R2 is grounded, a 2 nd pin of the chip U3 is connected to the control circuit, and a 4 th pin and a 5 th pin of the chip U3 are grounded.
Optionally, the control circuit includes: a chip U1 and a voltage output terminal V2, wherein the 1 st pin of the chip U1 is connected to the voltage output terminal V2, the 2 nd pin of the chip U1 is connected to the 2 nd pin of the chip U3, and the 3 rd pin, the 4 th pin and the 5 th pin of the chip U1 are connected to the second switch circuit.
Optionally, the second switching circuit includes: a chip U2, a resistor R3, a resistor R4 and a capacitor C2, wherein a first end of the capacitor C2 is connected to the 3 rd pin of the chip U1, a second end of the capacitor C2 is connected to the 1 st pin of the chip U2, a first end of the resistor R3 is connected to the 4 th pin of the chip U1, a second end of the resistor R3 is connected to the 2 nd pin of the chip U2, a first end of the resistor R4 is connected to the 5 th pin of the chip U1, a second end of the resistor R4 is connected to the 3 rd pin of the chip U2, a 4 th pin of the chip U2 is connected to the second output terminal, a 5 th pin of the chip U2 is grounded, and a 6 th pin of the chip U2 is connected to the first output terminal.
Optionally, the protection circuit further includes a first protection circuit, the first protection circuit is connected between the first switch circuit and the control circuit, the first protection circuit includes a capacitor C1 and a protection diode D3, a first end of the capacitor C1 is connected to the 2 nd pin of the chip U1, a second end of the capacitor C1 is grounded, a first end of the protection diode D3 is connected to the 2 nd pin of the chip U1, and a second end of the protection diode D3 is grounded.
Optionally, the protection circuit further includes a second protection circuit, the second protection circuit is connected between the control circuit and the second switch circuit, the second protection circuit includes an inductor L1, a capacitor C3 and a capacitor C4, a first end of the capacitor C3 is connected to a first end of the inductor L1, a second end of the capacitor C3 is grounded, a second end of the inductor L1 is connected to the 3 rd pin of the chip U1, a first end of the capacitor C4 is connected to a second end of the inductor L1, and a second end of the capacitor C4 is grounded.
Optionally, still include the third protection circuit, the third protection circuit with the second switch module is connected, the third protection circuit includes: the chip comprises a capacitor C5, a capacitor C6, a capacitor C9 and a protection diode D1, wherein a first end of the capacitor C5 is connected to the 6 th pin of the chip U2, a second end of the capacitor C5 is grounded, a first end of the capacitor C6 is connected to the second end of the capacitor C9, a second end of the capacitor C6 is grounded, a first end of the capacitor C9 is connected to the 6 th pin of the chip U2, a first end of the protection diode D1 is connected to the second end of the capacitor C9, and a second end of the protection diode D1 is grounded.
Optionally, the protection circuit further includes a fourth protection circuit, the fourth protection circuit is connected to the second switch module, and the fourth protection circuit includes: the chip comprises a capacitor C7, a capacitor C8, a capacitor C10 and a protection diode D2, wherein a first end of the capacitor C7 is connected to the 6 th pin of the chip U2, a second end of the capacitor C7 is grounded, a first end of the capacitor C8 is connected to the second end of the capacitor C10, a second end of the capacitor C8 is grounded, a first end of the capacitor C10 is connected to the 6 th pin of the chip U2, a first end of the protection diode D2 is connected to the second end of the capacitor C10, and a second end of the protection diode D2 is grounded.
Optionally, the first output terminal is connected to an external antenna U4, and the external antenna U4 is configured to receive the first radio frequency signal and transmit the first radio frequency signal to the outside.
Optionally, the second output terminal is connected to an internal antenna J1, and the internal antenna J1 is configured to receive the second radio frequency signal and transmit the second radio frequency signal to the outside.
The embodiment of the utility model discloses two radio frequency output circuit, include: a first switch circuit for outputting a first level signal or a second level signal according to a selection; the control circuit is connected with the first switch circuit and is used for outputting a first selection signal and a first radio frequency signal according to a first level signal or outputting a second selection signal and a second radio frequency signal according to a second level signal; and the second switch circuit is connected with the control circuit and is used for controlling the first radio-frequency signal to be output to the first output end according to the first selection signal or controlling the second radio-frequency signal to be output to the second output end according to the second selection signal. The utility model discloses a pass through single radio frequency output circuit and upgrade to double radio frequency output circuit through radio frequency switch to use on NB-IoT thing networking, realized that the application scene is more nimble, satisfy the customer demand under the prerequisite that does not change circuit design, reduce certain hardware cost, and can popularize and apply.
Drawings
Fig. 1 is a block diagram of a dual rf output circuit according to a first embodiment of the present invention;
fig. 2 is a circuit diagram of a dual rf output circuit according to a first embodiment of the present invention;
fig. 3 is a block diagram of a dual rf output circuit according to a second embodiment of the present invention;
fig. 4 is a circuit diagram of a dual rf output circuit according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first switching circuit may be referred to as a second switching circuit, and similarly, a second switching circuit may be referred to as a first switching circuit, without departing from the scope of the present application. The first switching circuit and the second switching circuit are both first switching circuits, but are not the same first switching circuit. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is the utility model provides a module connection diagram of dual radio frequency output circuit who provides in the embodiment one, this embodiment is applicable to the nimble condition of switching dual radio frequency circuit, include: first switch circuit 1, control circuit 2 and second switch circuit 3, specifically:
referring to fig. 2, fig. 2 is a circuit diagram of a dual rf output circuit in the present embodiment, in which a first switch circuit 1 is used for outputting a first level signal or a second level signal according to a selection. The first switch circuit 1 includes: the circuit comprises a chip U3, a resistor R1, a resistor R2 and a voltage output end V1, wherein a first end of the resistor R1 is connected to a 3 rd pin of the chip U3, a second end of the resistor R1 is connected to a voltage output end V1, a first end of the resistor R2 is connected to a 1 st pin of the chip U3, a second end of the resistor R2 is grounded, a 2 nd pin of the chip U3 is connected to the control circuit 2, and a 4 th pin and a 5 th pin of the chip U3 are grounded.
In this embodiment, the voltage output terminal V1 outputs 1.8V voltage, the chip U3 is a selection chip, and can selectively turn on the resistor R1 path of the 3 rd pin or selectively turn on the resistor R2 path of the 1 st pin, in an alternative embodiment, the chip U3 can also be replaced by a physical type switch U3, the on circuit is selected by shifting the shift position of the switch U3, the first level signal is a high level signal, and the second level signal is a low level signal. When the path of the resistor R1 is turned on, the 1.8V voltage at the voltage output terminal V1 is supplied to the chip U3, and the 2 nd pin of the chip U3 outputs the first level signal of high level and transmits it to the control circuit 2. When the path of the resistor R2 is turned on, the ground terminal is connected to the chip U3, and the 2 nd pin of the chip U3 outputs the second level signal of low level and transmits it to the control circuit 2.
The control circuit 2 is connected to the first switch circuit 1, and the control circuit 2 is configured to output a first selection signal and a first radio frequency signal according to the first level signal or output a second selection signal and a second radio frequency signal according to the second level signal. The control circuit 2 includes: a chip U1 and a voltage output terminal V2, wherein the 1 st pin of the chip U1 is connected to the voltage output terminal V2, the 2 nd pin of the chip U1 is connected to the 2 nd pin of the chip U3, and the 3 rd, 4 th and 5 th pins of the chip U1 are connected to the second switch circuit 3.
In this embodiment, the chip U1 is an MCU processor, and is capable of generating different radio frequency signals, such as a first radio frequency signal and a second radio frequency signal, according to user requirements, and generating a first selection signal and a second selection signal according to the generated radio frequency signals, where the first selection signal and the second selection signal are capable of controlling the operation mode of the second switch circuit 3, and the voltage output terminal V2 outputs a 3.3V voltage to provide a power supply for the operation of the chip U1. When the 2 nd pin of the chip U1 receives the first level signal of high level, the 5 th pin of the chip U1 outputs a high level signal, the 4 th pin of the chip U1 outputs a low level signal to constitute a first selection signal, and the 3 rd pin of the chip U1 outputs a first radio frequency signal to the second switch circuit 3. When the 2 nd pin of the chip U1 receives the second level signal of low level, the 5 th pin of the chip U1 outputs a low level signal, the 4 th pin of the chip U1 outputs a high level signal to constitute a second selection signal, and the 3 rd pin of the chip U1 outputs a second radio frequency signal to the second switch circuit 3.
The second switch circuit 3 is connected to the control circuit 2, and is configured to control the first radio frequency signal to be output to the first output terminal according to the first selection signal or control the second radio frequency signal to be output to the second output terminal according to the second selection signal. The first output end is connected to an external antenna U4, and the external antenna U4 is used for receiving the first radio frequency signal and transmitting the first radio frequency signal to the outside. The second output terminal is connected to the internal antenna J1, and the internal antenna J1 is used for receiving the second radio frequency signal and transmitting the second radio frequency signal to the outside.
In this embodiment, the first output terminal is the output terminal OUT1 and is connected to the 6 th pin of the chip U2, and the second output terminal is the output terminal OUT2 and is connected to the 4 th pin of the chip U2. External antenna U4 sets up outside equipment, has the good advantage of communication signal, but external antenna cost is higher, need consider waterproof, the condition such as lightning protection. The built-in antenna J1 is arranged inside the equipment, has poor communication effect in an area with poor network coverage, but has low cost and more use scenes. When the chip U2 receives a first selection signal, the 2 nd pin and the 6 th pin of the chip U2 are connected, the first radio frequency signal is output to the external antenna U4 through the output terminal OUT1, when the chip U2 receives a second selection signal, the 2 nd pin and the 4 th pin of the chip U2 are connected, the second radio frequency signal is output to the internal antenna J1 through the output terminal OUT2, the external antenna U4 or the internal antenna J1 can be controlled to be used through different selections of the first switch circuit 1, and the effect of freely selecting a communication mode is achieved.
The embodiment of the utility model discloses two radio frequency output circuit, include: a first switch circuit for outputting a first level signal or a second level signal according to a selection; the control circuit is connected with the first switch circuit and is used for outputting a first selection signal and a first radio frequency signal according to a first level signal or outputting a second selection signal and a second radio frequency signal according to a second level signal; and the second switch circuit is connected with the control circuit and is used for controlling the first radio-frequency signal to be output to the first output end according to the first selection signal or controlling the second radio-frequency signal to be output to the second output end according to the second selection signal. The utility model discloses a pass through single radio frequency output circuit and upgrade to double radio frequency output circuit through radio frequency switch to use on NB-IoT thing networking, realized that the application scene is more nimble, satisfy the customer demand under the prerequisite that does not change circuit design, reduce certain hardware cost, and can popularize and apply.
Example two
Fig. 3 is a block diagram of a dual rf output circuit provided in the second embodiment of the present invention, this embodiment is suitable for flexibly switching the dual rf output circuit, and this embodiment is implemented by adding the first protection circuit 4, the second protection circuit 5, the third protection circuit 6 and the fourth protection circuit 7 on the basis of the first embodiment, so as to ensure the complete waveform of the circuit. Specifically, the method comprises the following steps:
referring to fig. 4, fig. 4 is a circuit diagram of a dual rf output circuit in this embodiment, a first protection circuit 4 is connected between the first switch circuit and the control circuit, the first protection circuit 4 includes a capacitor C1 and a protection diode D3, a first end of the capacitor C1 is connected to the 2 nd pin of the chip U1, a second end of the capacitor C1 is grounded, a first end of the protection diode D3 is connected to the 2 nd pin of the chip U1, and a second end of the protection diode D3 is grounded.
In this embodiment, the capacitor C1 mainly functions to eliminate circuit interference, mechanical jitter of the toggle switch is eliminated by charging and discharging the capacitor C1, and the protection diode D3 is an ESD protection diode for protecting the circuit and preventing electrostatic discharge.
The second protection circuit 5 is connected between the control circuit and the second switch circuit, the second protection circuit 5 includes an inductor L1, a capacitor C3 and a capacitor C4, a first end of the capacitor C3 is connected to a first end of the inductor L1, a second end of the capacitor C3 is grounded, a second end of the inductor L1 is connected to the 3 rd pin of the chip U1, a first end of the capacitor C4 is connected to a second end of the inductor L1, and a second end of the capacitor C4 is grounded.
In this embodiment, the inductor L1, the capacitor C3, and the capacitor C4 are pi-type impedance matching circuits, and the impedance value is adjusted by adjusting the values of the capacitor and the inductor, so as to ensure that the impedance is 50 Ω, ensure the most efficient transmission of radio frequency signals, and reduce the signal reflection caused by impedance mismatch, so as to achieve 50 Ω impedance matching between the source and the load.
In this embodiment, the capacitor C5, the capacitor C6, and the capacitor C9 are also pi-type impedance matching circuits, and an additional general radio frequency switch is provided in the circuit design, which results in a longer PCB trace, so an impedance matching debugging bit number is reserved at the interface between the external antenna U4 and the internal antenna J1, thereby ensuring the most efficient transmission of signals. The protection diode D1 is an ESD protection diode for protecting the circuit from electrostatic discharge.
A fourth protection circuit 7 is connected to the second switch module, the fourth protection circuit 7 includes: the chip comprises a capacitor C7, a capacitor C8, a capacitor C10 and a protection diode D2, wherein a first end of the capacitor C7 is connected to the 6 th pin of the chip U2, a second end of the capacitor C7 is grounded, a first end of the capacitor C8 is connected to the second end of the capacitor C10, a second end of the capacitor C8 is grounded, a first end of the capacitor C10 is connected to the 6 th pin of the chip U2, a first end of the protection diode D2 is connected to the second end of the capacitor C10, and a second end of the protection diode D2 is grounded.
In this embodiment, the capacitor C7, the capacitor C8, and the capacitor C10 are also pi-type impedance matching circuits, and an additional general radio frequency switch is provided in the circuit design, which results in a longer PCB trace, so an impedance matching debugging bit number is reserved at the interface between the external antenna U4 and the internal antenna J1, thereby ensuring the most efficient transmission of signals. The protection diode D2 is an ESD protection diode for protecting the circuit from electrostatic discharge.
The embodiment of the utility model discloses two radio frequency output circuit, include: a first switch circuit for outputting a first level signal or a second level signal according to a selection; the control circuit is connected with the first switch circuit and is used for outputting a first selection signal and a first radio frequency signal according to a first level signal or outputting a second selection signal and a second radio frequency signal according to a second level signal; and the second switch circuit is connected with the control circuit and is used for controlling the first radio-frequency signal to be output to the first output end according to the first selection signal or controlling the second radio-frequency signal to be output to the second output end according to the second selection signal. The utility model discloses a pass through single radio frequency output circuit and upgrade to double radio frequency output circuit through radio frequency switch to use on NB-IoT thing networking, realized that the application scene is more nimble, satisfy the customer demand under the prerequisite that does not change circuit design, reduce certain hardware cost, and can popularize and apply.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A dual radio frequency output circuit, comprising:
a first switch circuit for outputting a first level signal or a second level signal according to a selection;
the control circuit is connected with the first switch circuit and is used for outputting a first selection signal and a first radio frequency signal according to the first level signal or outputting a second selection signal and a second radio frequency signal according to the second level signal;
and the second switch circuit is connected with the control circuit and is used for controlling the first radio-frequency signal to be output to the first output end according to the first selection signal or controlling the second radio-frequency signal to be output to the second output end according to the second selection signal.
2. A dual rf output circuit as claimed in claim 1, wherein the first switching circuit comprises: the circuit comprises a chip U3, a resistor R1, a resistor R2 and a voltage output end V1, wherein a first end of the resistor R1 is connected to a 3 rd pin of the chip U3, a second end of the resistor R1 is connected to the voltage output end V1, a first end of the resistor R2 is connected to a 1 st pin of the chip U3, a second end of the resistor R2 is grounded, a 2 nd pin of the chip U3 is connected to the control circuit, and a 4 th pin and a 5 th pin of the chip U3 are grounded.
3. A dual rf output circuit according to claim 2, wherein the control circuit comprises: a chip U1 and a voltage output terminal V2, wherein the 1 st pin of the chip U1 is connected to the voltage output terminal V2, the 2 nd pin of the chip U1 is connected to the 2 nd pin of the chip U3, and the 3 rd pin, the 4 th pin and the 5 th pin of the chip U1 are connected to the second switch circuit.
4. A dual rf output circuit according to claim 3, wherein the second switching circuit comprises: a chip U2, a resistor R3, a resistor R4 and a capacitor C2, wherein a first end of the capacitor C2 is connected to the 3 rd pin of the chip U1, a second end of the capacitor C2 is connected to the 1 st pin of the chip U2, a first end of the resistor R3 is connected to the 4 th pin of the chip U1, a second end of the resistor R3 is connected to the 2 nd pin of the chip U2, a first end of the resistor R4 is connected to the 5 th pin of the chip U1, a second end of the resistor R4 is connected to the 3 rd pin of the chip U2, a 4 th pin of the chip U2 is connected to the second output terminal, a 5 th pin of the chip U2 is grounded, and a 6 th pin of the chip U2 is connected to the first output terminal.
5. The dual RF output circuit of claim 4, further comprising a first protection circuit, wherein the first protection circuit is connected between the first switch circuit and the control circuit, the first protection circuit comprises a capacitor C1 and a protection diode D3, a first terminal of the capacitor C1 is connected to the No. 2 pin of the chip U1, a second terminal of the capacitor C1 is grounded, a first terminal of the protection diode D3 is connected to the No. 2 pin of the chip U1, and a second terminal of the protection diode D3 is grounded.
6. The dual radio frequency output circuit as claimed in claim 5, further comprising a second protection circuit, wherein the second protection circuit is connected between the control circuit and the second switch circuit, the second protection circuit comprises an inductor L1, a capacitor C3 and a capacitor C4, a first terminal of the capacitor C3 is connected to a first terminal of the inductor L1, a second terminal of the capacitor C3 is grounded, a second terminal of the inductor L1 is connected to the 3 rd pin of the chip U1, a first terminal of the capacitor C4 is connected to a second terminal of the inductor L1, and a second terminal of the capacitor C4 is grounded.
7. A dual rf output circuit according to claim 6, further comprising a third protection circuit, wherein the third protection circuit is connected to the second switch circuit, and the third protection circuit comprises: the chip comprises a capacitor C5, a capacitor C6, a capacitor C9 and a protection diode D1, wherein a first end of the capacitor C5 is connected to the 6 th pin of the chip U2, a second end of the capacitor C5 is grounded, a first end of the capacitor C6 is connected to the second end of the capacitor C9, a second end of the capacitor C6 is grounded, a first end of the capacitor C9 is connected to the 6 th pin of the chip U2, a first end of the protection diode D1 is connected to the second end of the capacitor C9, and a second end of the protection diode D1 is grounded.
8. The dual rf output circuit of claim 7, further comprising a fourth protection circuit, the fourth protection circuit being connected to the second switch circuit, the fourth protection circuit comprising: the chip comprises a capacitor C7, a capacitor C8, a capacitor C10 and a protection diode D2, wherein a first end of the capacitor C7 is connected to the 6 th pin of the chip U2, a second end of the capacitor C7 is grounded, a first end of the capacitor C8 is connected to the second end of the capacitor C10, a second end of the capacitor C8 is grounded, a first end of the capacitor C10 is connected to the 6 th pin of the chip U2, a first end of the protection diode D2 is connected to the second end of the capacitor C10, and a second end of the protection diode D2 is grounded.
9. The dual-rf output circuit as claimed in claim 1, wherein the first output terminal is connected to an external antenna U4, and the external antenna U4 is configured to receive the first rf signal and transmit the first rf signal to the outside.
10. A dual rf output circuit according to claim 1, wherein the second output terminal is connected to an internal antenna J1, the internal antenna J1 is used for receiving the second rf signal and transmitting the second rf signal to the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785994.3U CN212627866U (en) | 2020-05-13 | 2020-05-13 | Dual radio frequency output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785994.3U CN212627866U (en) | 2020-05-13 | 2020-05-13 | Dual radio frequency output circuit |
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| CN212627866U true CN212627866U (en) | 2021-02-26 |
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| CN202020785994.3U Active CN212627866U (en) | 2020-05-13 | 2020-05-13 | Dual radio frequency output circuit |
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