Coupler, coupling circuit and communication device thereof

Abstract

The present application discloses a coupler and its coupling circuit and communication device. The coupling circuit includes: a coupling line, a first adjustment member, a second adjustment member, a first coupling port and a second coupling port. The coupling line is coupled with the main transmission line, one end of the first adjustment member is connected to one end of the coupling line, and the other end is connected to the first coupling port. One end of the second adjustment member is connected to the other end of the coupling line and connected to the second coupling port. The coupling line is used to obtain a first coupling signal and a second coupling signal with opposite transmission directions from the main transmission line, and transmit the first coupling signal to the first coupling port and the second coupling signal to the second coupling port. The first adjustment member is used to adjust the isolation of the second coupling port. The second adjustment member is used to adjust the isolation of the first coupling port. In this way, it is possible to sample the transmission power and the reflected power using only one coupler, and the sampling circuit is small in size and has high consistency.

Description

Technical Field

[0001] The present application relates to the field of radio frequency technology, and in particular to a coupler and a coupling circuit and a communication device thereof. Background Art

[0002] In radio frequency communication devices, couplers are often used to couple out radio frequency signals with a certain coupling degree so as to facilitate separate observation or testing. Couplers can be used in various radio frequency circuits.

[0003] The inventors of the present application discovered during their long-term research and development work that traditional couplers can only collect or monitor transmission power or reflection power, and two couplers are required to collect transmission power and reflection power, resulting in the entire sampling circuit being large in size, complex in structure, difficult in processing technology, and poor in consistency. Summary of the invention

[0004] The main technical problem solved by the present application is how to achieve sampling of transmission power and reflection power with only one coupler, and the sampling circuit is small in size and has high consistency.

[0005] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a coupling circuit. The coupling circuit includes: a coupling line, a first adjustment member, a second adjustment member, a first coupling port and a second coupling port. The coupling line is coupled with the main transmission line, one end of the first adjustment member is connected to one end of the coupling line, the other end of the first adjustment member is connected to the first coupling port, one end of the second adjustment member is connected to the other end of the coupling line, and the other end of the second adjustment member is connected to the second coupling port; the coupling line is used to obtain a first coupling signal and a second coupling signal from the main transmission line, and transmit the first coupling signal to the first coupling port and the second coupling signal to the second coupling port; the first adjustment member is used to adjust the isolation of the second coupling port; the second adjustment member is used to adjust the isolation of the first coupling port; wherein the transmission direction of the first coupling signal is opposite to the transmission direction of the second coupling signal.

[0006] The coupling circuit includes a first potentiometer and a second potentiometer, wherein the first potentiometer has one end connected to the first adjusting member and the other end connected to the first coupling port, and is used to adjust the coupling degree of the first coupling port; the second potentiometer has one end connected to the second adjusting member and the other end connected to the second coupling port, and is used to adjust the coupling degree of the second coupling port.

[0007] Wherein, the first adjusting member and the second adjusting member are adjustable microstrip lines.

[0008] The coupling circuit further comprises: a first resistor, one end of which is connected to the first adjusting component and the other end is grounded; and a second resistor, one end of which is connected to the second adjusting component and the other end is grounded.

[0009] Wherein, the coupling circuit further includes: a first inductor and a first capacitor, one end of the first inductor is connected to one end of the coupling line, the other end of the first inductor is connected to the first adjusting component, one end of the first capacitor is connected to one end of the first inductor, and the other end of the first capacitor is grounded; a second inductor and a second capacitor, one end of the second inductor is connected to the other end of the coupling line, the other end of the second inductor is connected to the second adjusting component, one end of the second capacitor is connected to one end of the second inductor, and the other end of the second capacitor is grounded.

[0010] The coupling circuit further includes: a third resistor and a third capacitor, one end of the third resistor is connected to the first coupling port, the other end of the third resistor is grounded, one end of the third capacitor is connected to the first coupling port, and the other end of the third capacitor is grounded; a fourth resistor and a fourth capacitor, one end of the fourth resistor is connected to the second coupling port, the other end of the fourth resistor is grounded, one end of the fourth capacitor is connected to the second coupling port, and the other end of the fourth capacitor is grounded.

[0011] Wherein, the coupling circuit further includes: two gain adjustment circuits, respectively coupled to the first coupling port and the second coupling port.

[0012] In order to solve the above technical problems, another technical solution adopted by the present application is to provide a coupler. The coupler includes: an input port and an output port; a main transmission line, one end of which is connected to the input port and the other end is connected to the output port, and the main transmission line is used to output the radio frequency signal from the input port to the output port; the above coupling circuit is used to obtain the first coupling signal and the second coupling signal from the main transmission line, and output the first coupling signal to the first coupling port, and transmit the second coupling signal to the second coupling port.

[0013] Wherein, the coupler further comprises: a circuit board, and the coupling circuit is arranged on the circuit board.

[0014] In order to solve the above technical problem, another technical solution adopted by the present application is: to provide a communication device, which includes the above coupler.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the coupling circuit of the embodiment of the present application includes: a coupling line, a first adjustment component, a second adjustment component, a first coupling port and a second coupling port, the coupling line is coupled with the main transmission line, one end of the first adjustment component is connected to one end of the coupling line, the other end of the first adjustment component is connected to the first coupling port, one end of the second adjustment component is connected to the other end of the coupling line, and the other end of the second adjustment component is connected to the second coupling port; the coupling line is used to obtain the first coupling signal and the second coupling signal from the main transmission line, and transmit the first coupling signal to the first coupling port and transmit the second coupling signal to the second coupling port; the first adjustment component is used to adjust the isolation of the second coupling port; the second adjustment component is used to adjust the isolation of the first coupling port; wherein the transmission direction of the first coupling signal is opposite to the transmission direction of the second coupling signal. In this way, the coupling circuit of the embodiment of the present application can couple the signals with opposite transmission directions on the main transmission line respectively to obtain the first coupling signal and the second coupling signal respectively, and adjust the isolation of the second coupling port by the first adjustment member to ensure that the first coupling signal is transmitted unidirectionally to the first coupling port, and adjust the isolation of the first coupling port by the second adjustment member to ensure that the second coupling signal is transmitted unidirectionally to the second coupling port. Therefore, the coupling circuit of the embodiment of the present application can sample the transmission power and the reflected power by only one coupler; there is no need to use two couplers to sample the transmission power and the reflected power respectively, the sampling circuit is small in size, the processing technology is simple, and the consistency of the coupling signal is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a coupler of the present application;

[0018] Figure 2 is a circuit structure diagram of an embodiment of a coupling circuit of the present application;

[0019] Figure 3 yes Figure 2 A schematic diagram of the circuit board structure of the coupling circuit of the embodiment;

[0020] Figure 4 It is a structural diagram of an embodiment of a communication device of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] The terms "first" and "second" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0023] In communication systems, it is necessary to monitor the transmission power and reflected power. A coupler is a device with directional transmission characteristics. Its essence is to distribute the power of microwave signals in a certain proportion. Traditional couplers can divide power from the forward wave of the main transmission line in a certain proportion, but cannot divide power from the reverse wave. They can be used to isolate, separate and mix signals and perform power signal sampling. One end of a traditional coupler is a coupling output end, and the other end is an isolation end. It can only couple signals in one direction. If it is necessary to sample the transmission power and reflected power at the same time, two couplers are required to achieve this. The space occupied is large, the isolation between the two couplers is difficult to handle, and the signal consistency is poor.

[0024] To solve the above problems, the present application first proposes a coupler, such as Figure 1 As shown, Figure 1 1 is a schematic diagram of the structure of an embodiment of a coupler of the present application. The coupler 101 of the present embodiment includes: an input port 104, an output port 105, a main transmission line 102 and a coupling circuit 110, wherein one end of the main transmission line 102 is connected to the input port 104, and the other end of the main transmission line 102 is connected to the output port 105, and the main transmission line 102 is used to output the radio frequency signal from the input port 104 to the output port 105; the coupling circuit 110 is used to obtain a first coupling signal and a second coupling signal from the main transmission line 102, and output the first coupling signal to the first coupling port 106, and transmit the second coupling signal to the second coupling port 107.

[0025] During the transmission of radio frequency signals, reflected power is usually generated. In order to improve the stability of the communication system, it is usually necessary to sample the reflected power. In the coupler 101 of this embodiment, the coupling circuit 110 is provided with a first coupling port 106 and a second coupling port 107, which can couple and output the transmission power and the reflected power respectively, so as to sample the transmission power and the reflected power at the same time.

[0026] The coupler 101 of this embodiment further includes: a circuit board (not shown), and the coupling circuit 110 is arranged on the circuit board.

[0027] The present application further proposes a coupling circuit for a coupler, such as Figure 2 and Figure 3 As shown, Figure 2 is a circuit structure diagram of an embodiment of a coupling circuit of the present application; Figure 3 yes Figure 2 A schematic diagram of the circuit board structure of the coupling circuit of the embodiment. The coupling circuit 110 of this embodiment can be used for the above-mentioned coupler 101. The coupling circuit 110 of this embodiment includes: a coupling line 111, a first adjustment member 112, a second adjustment member 113, a first coupling port 106 and a second coupling port 107. The coupling line 111 is coupled with the main transmission line 102. One end of the first adjustment member 112 is connected to one end of the coupling line 111, and the other end of the first adjustment member 112 is connected to the first coupling port 106. One end of the second adjustment member 113 is connected to the other end of the coupling line 111, and the other end of the second adjustment member 113 is connected to the second coupling port 107. The coupling line 111 is used to obtain a first coupling signal and a second coupling signal from the main transmission line 102, and is used to transmit the first coupling signal to the first coupling port 106 and the second coupling signal to the second coupling port 107. The first adjustment member 112 is used to adjust the isolation of the second coupling port 107. The second adjustment member 113 is used to adjust the isolation of the first coupling port 106, wherein the transmission direction of the first coupling signal is opposite to the transmission direction of the second coupling signal.

[0028] Different from the prior art, the coupling circuit 110 of this embodiment can couple the signals with opposite transmission directions on the main transmission line 102 respectively to obtain the first coupling signal and the second coupling signal respectively, and adjust the isolation of the second coupling port 107 through the first adjustment member 112 to ensure that the first coupling signal is unidirectionally transmitted to the first coupling port 106, and adjust the isolation of the first coupling port 106 through the second adjustment member 113 to ensure that the second coupling signal is unidirectionally transmitted to the second coupling port 107. Therefore, the coupling circuit 110 of this embodiment can sample the transmission power and the reflected power by using only one coupler; there is no need to use two couplers to sample the transmission power and the reflected power respectively, the sampling circuit is small in size, the processing technology is simple, and the consistency of the coupling signal is high.

[0029] The coupling line 111 of this embodiment is a microstrip line. In other embodiments, a coaxial line, a rectangular waveguide or a strip line may be used instead of the microstrip line.

[0030] Among them, the first adjustment member 112 and the second adjustment member 113 of this embodiment are adjustable microstrip lines, and the impedance of the coupling line 111 to the first coupling port 106 can be adjusted by adjusting the impedance of the first adjustment member 112, so that the impedance of the coupling line 111 to the first coupling port 106 satisfies impedance matching, thereby preventing the second coupling port 107 from having signal reflection; the impedance of the coupling line 111 to the second coupling port 107 can be adjusted by adjusting the impedance of the second adjustment member 113, so that the impedance of the coupling line 111 to the second coupling port 107 satisfies impedance matching, thereby preventing the first coupling port 106 from having signal reflection.

[0031] The microstrip line can be realized by providing a copper-plated layer on the circuit board, and the impedance of the microstrip line can be adjusted by adjusting the width, length and thickness of the copper-plated layer.

[0032] In other embodiments, a variable resistor or the like may be used instead of the adjustable microstrip line.

[0033] Optionally, the coupling circuit 110 of this embodiment further includes a first potentiometer RV1 and a second potentiometer RV2, wherein one end of the first potentiometer RV1 is connected to the first adjusting member 112, and the other end of the first potentiometer RV1 is connected to the first coupling port 106, for adjusting the coupling degree of the first coupling port 106; one end of the second potentiometer RV2 is connected to the second adjusting member 113, and the other end of the second potentiometer RV2 is connected to the second coupling port 107, for adjusting the coupling degree of the second coupling port 107.

[0034] Among them, the strength of the first coupling signal output from the first coupling port 106, that is, the coupling degree of the first coupling port 106, can be adjusted by adjusting the impedance of the first potentiometer RV1; the strength of the second coupling signal output from the second coupling port 107, that is, the coupling degree of the second coupling port 107, can be adjusted by adjusting the impedance of the second potentiometer RV2.

[0035] Optionally, the coupling circuit 110 of this embodiment further includes: a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the first adjustment member 112, and the other end of the first resistor R1 is grounded; one end of the second resistor R2 is connected to the second adjustment member 113, and the other end of the second resistor R2 is grounded.

[0036] In this embodiment, the first adjustment member 112 (microstrip line) is grounded through the first resistor R1 to improve the quality of the first coupling signal; the second adjustment member 113 (microstrip line) is grounded through the second resistor R2 to improve the quality of the second coupling signal.

[0037] Optionally, the coupling circuit 110 of this embodiment further includes: a first inductor L1, a first capacitor C1, a second inductor L2 and a second capacitor C2, one end of the first inductor L1 is connected to one end of the coupling line 111, the other end of the first inductor L1 is connected to the first adjustment component 112, one end of the first capacitor C1 is connected to one end of the first inductor L1, and the other end of the first capacitor C1 is grounded; one end of the second inductor L2 is connected to the other end of the coupling line 111, the other end of the second inductor L2 is connected to the second adjustment component 113, one end of the second capacitor C2 is connected to one end of the second inductor L2, and the other end of the second capacitor C2 is grounded.

[0038] In this embodiment, the first inductor L1 and the first capacitor C1 can filter the first coupled signal to improve the quality of the first coupled signal; the second inductor L2 and the second capacitor C2 can filter the second coupled signal to improve the quality of the second coupled signal.

[0039] Optionally, the coupling circuit 110 of this embodiment further includes: a third resistor R3, a third capacitor C3, a fourth resistor R4 and a fourth capacitor C4, one end of the third resistor R3 is connected to the first coupling port 106, the other end of the third resistor R3 is grounded, one end of the third capacitor C3 is connected to the first coupling port 106, and the other end of the third capacitor C3 is grounded; one end of the fourth resistor R4 is connected to the second coupling port 107, the other end of the fourth resistor R4 is grounded, one end of the fourth capacitor C4 is connected to the second coupling port 107, and the other end of the fourth capacitor C4 is grounded.

[0040] The third resistor R3 and the third capacitor C3 of this embodiment can filter the first coupled signal to improve the quality of the first coupled signal; the fourth resistor R4 and the fourth capacitor C4 can filter the second coupled signal to improve the quality of the second coupled signal.

[0041] Optionally, the coupling circuit 110 may further include two gain adjustment circuits (not shown), respectively coupled to the first coupling port 106 and the second coupling port 107 , to respectively adjust the first coupling signal and the second coupling signal, thereby increasing the coupling bandwidth of the coupler 101 .

[0042] The present application further proposes a communication device, such as Figure 4 As shown, Figure 4 The communication device 2401 of this embodiment includes a coupler 2402, wherein the coupler 2402 is the coupler described in the above embodiment, and will not be described in detail here.

[0043] Different from the prior art, the coupling circuit of the embodiment of the present application includes: a coupling line, a first adjustment member, a second adjustment member, a first coupling port and a second coupling port, the coupling line is coupled with the main transmission line, one end of the first adjustment member is connected to one end of the coupling line, the other end of the first adjustment member is connected to the first coupling port, one end of the second adjustment member is connected to the other end of the coupling line, and the other end of the second adjustment member is connected to the second coupling port; the coupling line is used to obtain the first coupling signal and the second coupling signal from the main transmission line, and transmit the first coupling signal to the first coupling port and the second coupling signal to the second coupling port; the first adjustment member is used to adjust the isolation of the second coupling port; the second adjustment member is used to adjust the isolation of the first coupling port; wherein the transmission direction of the first coupling signal is opposite to the transmission direction of the second coupling signal. In this way, the coupling circuit of the embodiment of the present application can realize the coupling of signals with opposite transmission directions on the main transmission line respectively, so as to obtain the first coupling signal and the second coupling signal respectively, and adjust the isolation of the second coupling port by the first adjustment member to ensure that the first coupling signal is transmitted unidirectionally to the first coupling port, and adjust the isolation of the first coupling port by the second adjustment member to ensure that the second coupling signal is transmitted unidirectionally to the second coupling port. Therefore, the coupling circuit of the embodiment of the present application can realize the sampling of the transmission power and the reflected power by using only one coupler; there is no need to use two couplers to respectively realize the sampling of the transmission power and the reflected power. The sampling circuit is small in size, the processing technology is simple, and the consistency of the coupling signal is high.

[0044] Furthermore, the output power of the coupling signal of the coupler of the present application can be adjusted, and the isolation of the coupling port can be adjusted; the various performance indicators of the coupler are easy to achieve, the size is small, the structural design, processing technology and assembly process are simplified, the production cost is reduced, the production efficiency is improved, it is easy to load and transport, and it is conducive to the integrated design of the communication device, which is more competitive.

[0045] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A coupling circuit, characterized in that: The coupling circuit comprises: a coupling line, a first adjusting member, a second adjusting member, a first coupling port and a second coupling port, wherein the coupling line is coupled with the main transmission line, one end of the first adjusting member is connected to one end of the coupling line, the other end of the first adjusting member is connected to the first coupling port, one end of the second adjusting member is connected to the other end of the coupling line, and the other end of the second adjusting member is connected to the second coupling port; The coupling line is used to obtain a first coupling signal and a second coupling signal from the main transmission line, and transmit the first coupling signal to the first coupling port and transmit the second coupling signal to the second coupling port; the first adjusting member is used to adjust the isolation of the second coupling port; the second adjusting member is used to adjust the isolation of the first coupling port; wherein a transmission direction of the first coupling signal is opposite to a transmission direction of the second coupling signal; Wherein, the coupling circuit further comprises: a first potentiometer, one end of which is connected to the first adjusting member, and the other end of which is connected to the first coupling port, and is used to adjust the coupling degree of the first coupling port; a second potentiometer, one end of which is connected to the second adjusting member, and the other end of which is connected to the second coupling port, for adjusting the coupling degree of the second coupling port; Wherein, the first adjusting member and the second adjusting member are adjustable microstrip lines.

2. The coupling circuit according to claim 1, characterized in that: The coupling circuit further comprises: a first resistor, one end of which is connected to the first adjusting member, and the other end of which is grounded; The second resistor has one end connected to the second adjusting member and the other end grounded.

3. The coupling circuit according to claim 1, characterized in that: The coupling circuit further comprises: a first inductor and a first capacitor, wherein one end of the first inductor is connected to one end of the coupling line, the other end of the first inductor is connected to the first adjusting member, one end of the first capacitor is connected to the one end of the first inductor, and the other end of the first capacitor is grounded; A second inductor and a second capacitor, one end of the second inductor is connected to the other end of the coupling line, the other end of the second inductor is connected to the second adjusting member, one end of the second capacitor is connected to the one end of the second inductor, and the other end of the second capacitor is grounded.

4. The coupling circuit according to claim 1, characterized in that: The coupling circuit further comprises: a third resistor and a third capacitor, one end of the third resistor is connected to the first coupling port, the other end of the third resistor is grounded, one end of the third capacitor is connected to the first coupling port, and the other end of the third capacitor is grounded; a fourth resistor and a fourth capacitor, one end of the fourth resistor is connected to the second coupling port, the other end of the fourth resistor is grounded, one end of the fourth capacitor is connected to the second coupling port, and the other end of the fourth capacitor is grounded.

5. The coupling circuit according to claim 1, characterized in that: The coupling circuit further includes: two gain adjustment circuits respectively coupled to the first coupling port and the second coupling port.

6. A coupler, characterized in that: The coupler comprises: Input ports and output ports; A main transmission line, one end of which is connected to the input port and the other end of which is connected to the output port, the main transmission line being used to output the radio frequency signal from the input port to the output port; The coupling circuit according to any one of claims 1 to 5 is used to obtain the first coupling signal and the second coupling signal from the main transmission line, and output the first coupling signal to the first coupling port, and transmit the second coupling signal to the second coupling port.

7. The coupler according to claim 6, characterized in that The coupler further includes a circuit board, and the coupling circuit is arranged on the circuit board.

8. A communication device, characterized in that: The communication device comprises the coupler according to any one of claims 6 or 7.

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