Ultra-wideband high-power signal monitoring circuit

Abstract

The embodiment of the invention relates to the technical field of ultra-wideband high-power emission, in particular to an ultra-wideband high-power signal monitoring circuit which comprises a high-power amplifier, a directional coupler, an attenuation matching module, a detection module, an operational amplification module and a comparison unit. The monitoring circuit couples an input microwave radio-frequency signal of a high-power amplifier based on a directional coupler and a corresponding reflection microwave radio-frequency signal, respectively performs attenuation matching and detection, then enters a comparison circuit, converts the input microwave radio-frequency signal and the reflection microwave radio-frequency signal into a standing-wave ratio and compares the standing-wave ratio with a threshold value, and if the standing-wave ratio is smaller than the threshold value, the monitoring circuit is started. If the standing-wave ratio is greater than or equal to the threshold value, outputting a low level for the control circuit to turn on a drain power supply of the high-power amplifier, and if the standing-wave ratio is greater than or equal to the threshold value, outputting a high level for the control circuit to turn off the drain power supply of the high-power amplifier, thereby preventing the high-power amplifier from being damaged due to high-power reflection.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of ultra-wideband high-power transmission of electronic information systems, and in particular to an ultra-wideband high-power signal monitoring circuit. Background Art

[0002] In recent years, with the rapid development of electronic information systems, EMC (Electro Magnetic Compatibility) testing and other fields, people have an increasing demand for high-performance, high-power interference emission systems. At present, solid-state power amplifiers synthesized by solid-state devices with significant advantages such as large bandgap width, high saturated electron offset velocity, and high breakdown electric field strength have been gradually applied to transmission systems. In order to achieve ultra-wideband high transmission power of the transmission system, in addition to using high-power GaN (gallium nitride) chip units to synthesize power, the reliability improvement of high-power devices must also be considered.

[0003] The traditional method to improve the reliability of power amplifiers is to add a circulator or isolator at the output end of the power amplifier, such as Figure 1 As shown in Figure 1, the biggest problem with this improvement method is that it is difficult to find ultra-wideband ring devices or isolators covering 2GHz to 18GHz, and the device structure size and insertion loss are large, which directly affects the output power index of the solid-state power amplifier and affects the synthesis efficiency of the power amplifier device. In addition, there is also a broadband high-power protection circuit design method, such as Figure 2 As shown, the reflected microwave signal of the RF main signal is directionally coupled by the coupling unit using the coupling circuit on the same plane as the main signal circuit, and then sent to the control unit after matching, amplification, detection, and comparison. The power supply circuit determines the level based on the standing wave size of the control unit and takes corresponding measures. The biggest problem with this method is that the ultra-wideband circuit couples the RF signal with large fluctuations, resulting in the inability to determine the real-time judgment threshold, and the coupling circuit will occupy the plane space size of the power amplifier, affecting the integration level of the power amplifier. In addition, the electromagnetic compatibility problem of the circuit is difficult to avoid, which will affect the electrical performance of the power amplifier. Summary of the invention

[0004] In view of this, the embodiments of the present application propose an ultra-wideband high-power signal monitoring circuit, which can output high and low levels by determining the level state, and automatically turn on or off the drain power supply of the high-power amplifier through logical judgment. It also has the advantages of simple circuit topology design, simple manufacturing process, flexible disassembly, relatively wide operating frequency bandwidth, and relatively small insertion loss.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the present application proposes an ultra-wideband high-power signal monitoring circuit, and the monitoring circuit includes: a high-power amplifier, used to receive an input microwave signal, and output the input microwave signal at a high power saturation to the power input end of a directional coupler; a directional coupler, used to receive an input microwave radio frequency signal input by the high-power amplifier, directly transmit it to the saturated power output end to output it to the antenna, and power-couple the input microwave radio frequency signal to the forward power coupling output end to output it to the attenuation matching module, and power-couple the output reflected microwave radio frequency signal corresponding to the input microwave radio frequency signal to the reflected power coupling output end to output the attenuation matching module; an attenuation matching module, used to receive a coupled signal of the input microwave radio frequency signal, and output a coupled signal of the reflected microwave radio frequency signal, use a microwave circuit to match the high-power coupled signal, and use a microwave attenuator to attenuate the matched signal to a preset power range for output; a detection module, used to receive an input microwave radio frequency signal with good matching attenuation, and output the output reflected microwave radio frequency signal to the attenuation matching module; The invention relates to a method for transmitting the coupled signal of the input microwave radio frequency signal to the control circuit, and a coupled signal of the output reflected microwave radio frequency signal with good matching attenuation. The detection circuit is used to convert the radio frequency signal into a DC voltage signal, and the matched output is output to the operational amplifier module; the operational amplifier module is used to receive the DC voltage signal of the input microwave radio frequency signal and the DC voltage signal of the output reflected microwave radio frequency signal, and according to the voltage difference of different frequency points, the voltage values ​​of different frequency points are matched and amplified and output; the comparison unit is used to receive the DC voltage signal output by the operational amplifier module and the threshold signal output by the control circuit, and the DC voltage signal of the input microwave radio frequency signal after operational amplification and the DC voltage signal of the reflected microwave radio frequency signal after operational amplification are converted into a standing wave ratio by using the comparison circuit, and compared with the threshold value in the threshold signal, if the standing wave ratio is less than the threshold value, a low level is output for the control circuit to keep the drain power supply of the high power amplifier turned on, and if the standing wave ratio is greater than or equal to the threshold value, a high level is output for the control circuit to turn off the drain power supply of the high power amplifier.

[0006] In some optional embodiments, the attenuation matching module is composed of a first attenuation matching unit and a second attenuation matching unit, the first attenuation matching unit is connected to the forward power coupling output end of the directional coupler, and the second attenuation matching unit is connected to the reflected power coupling output end of the directional coupler; the first attenuation matching unit is used to receive the coupled signal of the input microwave RF signal, use the microwave circuit to match the coupled signal of the input microwave RF signal, and use the microwave attenuator to attenuate the matching signal to a preset power range and output it to the detection module; the second attenuation matching unit is used to receive the coupled signal of the output reflected microwave RF signal, use the microwave circuit to match the coupled signal of the output reflected microwave RF signal, and use the microwave attenuator to attenuate the matching signal to a preset power range and output it to the detection module.

[0007] In some optional embodiments, the preset power range is 0 dBm to 10 dBm.

[0008] In some optional embodiments, the detection module is composed of a first detection unit and a second detection unit, the first detection unit is connected to the first attenuation matching unit, and the second detection unit is connected to the second attenuation matching unit; the first detection unit is used to use the detection circuit to convert the coupled signal of the matched and attenuated input microwave RF signal into a DC voltage signal, and match it to the output to the operational amplifier module; the second detection unit is used to use the detection circuit to convert the coupled signal of the matched and attenuated output reflected microwave RF signal into a DC voltage signal, and match it to the output to the operational amplifier module.

[0009] In some optional embodiments, the operational amplifier module is composed of a first operational amplifier and a second operational amplifier, the first operational amplifier is connected to the first detection unit, and the second operational amplifier is connected to the second detection unit; the first operational amplifier is used to receive a DC voltage signal of an input microwave radio frequency signal, and according to the voltage difference of different frequencies of the DC voltage signal of the input microwave radio frequency signal, the voltage values ​​at different frequencies are matched and amplified for output; the second operational amplifier is used to receive a DC voltage signal of an output reflected microwave radio frequency signal, and according to the voltage difference of different frequencies of the DC voltage signal of the output reflected microwave radio frequency signal, the voltage values ​​at different frequencies are matched and amplified for output.

[0010] In some optional embodiments, the bandwidth coverage of the directional coupler is 2 GHz to 18 GHz, the passband loss is less than 1 dB, the coupling degree is 40±2 dB, the directivity is greater than 15 dB, and the standing wave ratio is not greater than 2.

[0011] In some optional embodiments, the circuit structure of the directional coupler adopts a suspended strip line type, and the real-time monitoring of the radio frequency signal is achieved through air coupling in a direction perpendicular to the high-power radio frequency main signal circuit.

[0012] The ultra-wideband high-power signal monitoring circuit proposed in this application has the following positive effects.

[0013] First, an ultra-wideband high-power signal monitoring circuit proposed in this application is an ultra-wideband extremely low dissipation and high-efficiency circuit. Traditional circulators and isolators cannot cover the ultra-wideband bandwidth of 2GHz to 18GHz, and connecting them in series in the RF transmission circuit will directly affect the final power output and synthesis efficiency. The method of coupling the reflected microwave signal of the RF main signal with the monitoring and comparison circuit using the coupling circuit on the same plane as the main signal circuit is difficult to solve the problem that the real-time judgment threshold cannot be determined due to the large fluctuations of the RF signal coupled to the ultra-wideband circuit. The real-time monitoring and comparison circuit of the positive reflection signal of the RF main signal adopted in this application can well avoid the above problems, and the spatial coupling method of the directional coupler has little effect on the output power of the main signal, which greatly improves the efficient output of the ultra-wideband circuit.

[0014] Second, the ultra-wideband high-power signal monitoring circuit proposed in this application is a miniaturized integrated design. The coupling circuit designed in this application can directly output in the plane direction of the vertical power amplifier microwave transmission circuit. Compared with the traditional coupling form, it has the advantages of higher integration and easier processing.

[0015] Third, the manufacturing cost is low. The ultra-wideband high-power signal monitoring circuit proposed in this application has strong feasibility, simple circuit, and the mass production cost is much lower than other traditional high-power monitoring or protection circuit structures.

[0016] Fourth, it is scalable. In addition to real-time monitoring of the output power and protecting power devices from damage, the ultra-wideband high-power signal monitoring circuit proposed in this application can also use double-side coupling to perform amplitude and phase correction of multi-channel power amplifiers. In addition, as an independent circuit structure, the monitoring circuit can be independently processed and flexibly disassembled, and can be flexibly selected as an extended function of the high-power amplifier.

[0017] In summary, the ultra-wideband high-power signal monitoring circuit proposed in the present application can output high and low levels by determining the level state, and automatically turn on or off the drain power supply of the high-power amplifier through logical judgment. It has the advantages of simple circuit topology design, simple manufacturing process, flexible disassembly, relatively wide operating frequency bandwidth, and relatively small insertion loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related technologies, the drawings required for use in the embodiments of the present application or the related technical descriptions 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.

[0019] Figure 1 It is a circuit diagram of a protection circuit with a circulator or isolator added to the output end of a power amplifier;

[0020] Figure 2 It is a circuit diagram of a power amplifier real-time monitoring and protection circuit based on planar directional coupling;

[0021] Figure 3 An ultra-wideband high-power signal monitoring circuit is provided in one embodiment of the present application. Figure 1 ;

[0022] Figure 4 An ultra-wideband high-power signal monitoring circuit is provided in one embodiment of the present application. Figure 2 ;

[0023] Figure 5 is a circuit diagram of a directional coupler provided in one embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In the various embodiments of the present application, many technical details are proposed in order to make the reader better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is only for the convenience of description, and the specific implementation mode of the present application should not constitute any limitation. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0025] An embodiment of the present application proposes an ultra-wideband high-power signal monitoring circuit. The implementation details of the ultra-wideband high-power signal monitoring circuit proposed in this embodiment are specifically described below. The following content is only the implementation details provided for the convenience of understanding and is not necessary for the implementation of this solution.

[0026] The circuit principle of an ultra-wideband high-power signal monitoring circuit proposed in this embodiment is as follows: Figure 3 and Figure 4 As shown, the monitoring circuit specifically includes: a high power amplifier 10, a directional coupler 20, an attenuation matching module 30, a detection module 40, an operational amplifier module 50, a comparison unit 60 and an antenna 70. The directional coupler 20 has a power input terminal 21, a saturated power output terminal 22, a forward power coupling output terminal 23 and a reflected power coupling output terminal 24. The power input terminal 21 is connected to the high power amplifier 10, the saturated power output terminal 22 is connected to the antenna 70, the forward power coupling output terminal 23 and the reflected power coupling output terminal 24 are both connected to the attenuation matching module 30, the attenuation matching module 30 is also connected to the modeling module 40, the detection module 40 is also connected to the operational amplifier module 50, and the operational amplifier module 50 is also connected to the comparison unit 60.

[0027] An ultra-wideband high-power signal monitoring circuit proposed in this embodiment mainly uses the standing wave ratio of the microwave signal to infer the strength of the reflected power reaching the output end of the GaN power amplifier chip, the core of the power amplifier, and sets the matching attenuation value based on the maximum reflected power value that the power amplifier chip can withstand. The drain power supply of the chip is monitored and switched in real time, thereby realizing real-time monitoring and protection of the entire power amplifier circuit.

[0028] The standing wave ratio is a measure of the transmission of microwave signals on a transmission line and is defined as:

[0029] VSWR = (1 + |Γ|) / (1 - |Γ|);

[0030] Where Γ is the reflection coefficient, which is defined as the voltage or current ratio of the reflected signal to the incident signal.

[0031] The following is a detailed introduction to the various components in the monitoring circuit.

[0032] The high power amplifier 10 is used to receive an input microwave signal and amplify the power of the received input microwave signal, thereby outputting the input microwave signal at a high power saturation to a power input terminal 21 of the directional coupler 20 .

[0033] The directional coupler 20 is used to receive the input microwave RF signal input by the high-power amplifier 10, directly transmit it to the saturated power output terminal 22 to output it to the antenna 70, and power-couple the input microwave RF signal to the forward power coupling output terminal 23 to output it to the attenuation matching module 30, power-reflect the input microwave RF signal to obtain the corresponding output reflected microwave RF signal, and power-couple the output reflected microwave RF signal to the reflected power coupling output terminal 24 to output it to the attenuation matching module 30.

[0034] The circuit principle of directional coupler is as follows Figure 5 As shown, the circuit structure of the directional coupler adopts a suspended stripline type, and the real-time monitoring of the RF signal is achieved through air coupling in the direction of the vertical high-power RF main signal circuit. The suspended stripline directional coupler realizes high isolation and real-time reception of the RF output signal and the transmission signal without affecting the transmission of the high-power RF main signal through air coupling in the direction of the vertical high-power RF main signal circuit. Such a directional coupler has the characteristics of simple circuit topology design, simple manufacturing process, flexible disassembly, wide operating frequency bandwidth, and small insertion loss.

[0035] The performance indicators of directional couplers are as follows: bandwidth coverage range is 2GHz to 18GHz, passband loss is less than 1dB, coupling degree is 40±2dB, directivity is greater than 15dB, and standing wave ratio is not greater than 2. Directional couplers with these performance indicators can ensure the realization of positive and negative power coupling detection on the basis of meeting the output power requirements.

[0036] The attenuation matching module 30 is used to receive the coupled signal of the input microwave radio frequency signal and output the coupled signal of the reflected microwave radio frequency signal, use the microwave circuit to match the high-power coupled signal, and use the microwave attenuator to attenuate the matched signal to a preset power range for output.

[0037] like Figure 4As shown, the attenuation matching module 30 is specifically composed of a first attenuation matching unit 31 and a second attenuation matching unit 32. The first attenuation matching unit 31 is connected to the forward power coupling output end 23 of the directional coupler 20, and the second attenuation matching unit 32 is connected to the reflected power coupling output end 24 of the directional coupler 20.

[0038] The first attenuation matching unit 31 is used to receive the coupled signal of the input microwave RF signal, use the microwave circuit to match the coupled signal of the input microwave RF signal, and use the microwave attenuator to attenuate the matched signal to a preset power range (generally designed to be 0dBm to 10dB) and output it to the detection module 40.

[0039] The second attenuation matching unit 32 is used to receive the coupled signal of the output reflected microwave RF signal, use the microwave circuit to match the coupled signal of the output reflected microwave RF signal, and use the microwave attenuator to attenuate the matched signal to a preset power range (generally designed to be 0dBm to 10dB) and output it to the detection module 40.

[0040] The detection module 40 is used to receive the coupled signal of the input microwave RF signal with matching attenuation, and the coupled signal of the output reflected microwave RF signal with matching attenuation, and use the detection circuit to convert both RF signals into DC voltage signals (also called video signals, video voltage signals), and match and output them to the operational amplifier module 50.

[0041] like Figure 4 As shown, the detection module 40 is composed of a first detection unit 41 and a second detection unit 42 . The first detection unit 41 is connected to the first attenuation matching unit 31 , and the second detection unit 42 is connected to the second attenuation matching unit 32 .

[0042] The first detection unit 41 is used to convert the coupled signal of the matched attenuated input microwave radio frequency signal into a DC voltage signal by using a detection circuit, and output the DC voltage signal to the operational amplifier module 50 in a matched manner.

[0043] The second detection unit 42 is used for converting the coupled signal of the output reflected microwave radio frequency signal with good matching attenuation into a DC voltage signal by using a detection circuit, and matching and outputting it to the operational amplifier module 50 .

[0044] The operational amplifier module 50 is used to receive the DC voltage signal of the input microwave radio frequency signal and output the DC voltage signal of the reflected microwave radio frequency signal, and according to the voltage difference between the two DC voltage signals at different frequencies, the voltage values ​​at different frequencies are matched and amplified and output (output to the comparison unit 60).

[0045] like Figure 4As shown, the operational amplifier module 50 is composed of a first operational amplifier 51 and a second operational amplifier 52 . The first operational amplifier 51 is connected to the first detection unit 41 , and the second operational amplifier 52 is connected to the second detection unit 42 .

[0046] The first operational amplifier 51 is used to receive the DC voltage signal of the input microwave radio frequency signal, and according to the voltage difference of the DC voltage signal of the input microwave radio frequency signal at different frequency points, match and amplify the voltage values ​​at different frequency points for output.

[0047] The second operational amplifier 52 is used to receive the DC voltage signal of the output reflected microwave radio frequency signal, and according to the voltage difference of the DC voltage signal of the output reflected microwave radio frequency signal at different frequency points, match and amplify the voltage values ​​at different frequency points for output.

[0048] The comparison unit 60 is used to receive the DC voltage signal output by the operational amplifier module 50 and the threshold signal output by the control circuit, and use the comparison circuit to convert the DC voltage signal of the input microwave radio frequency signal after operational amplification and the DC voltage signal of the reflected microwave radio frequency signal after operational amplification into a standing wave ratio, and compare them with the threshold value in the threshold signal. If the standing wave ratio is less than the threshold value, a low level is output for the control circuit to keep the drain power supply of the high power amplifier turned on. If the standing wave ratio is greater than or equal to the threshold value, a high level is output for the control circuit to shut down the drain power supply of the high power amplifier, thereby preventing the high power amplifier from being damaged due to high power reflection.

[0049] After being processed by the directional coupler, attenuation matching module, detection module, operational amplifier module and comparison unit, when the high-power amplifier is working, the problem of high-power reflection to the chip causing damage due to high active standing wave will be monitored in real time. When the reflected power reaches the judgment threshold value, the drain power supply of the high-power amplifier is cut off in time to achieve the purpose of timely protecting the high-power amplifier from damage. This circuit structure is suitable for real-time monitoring of RF signals of narrowband and ultra-wideband high-power amplifiers (equipment). It cleverly uses the high symmetry of the high-directivity directional coupler to achieve high-isolation coupling output of high-power input RF signals and the transmission signal of the same frequency, avoiding the problem that the real-time judgment threshold cannot be determined due to the large fluctuation of the broadband signal of the traditional coupling circuit.

[0050] The ultra-wideband high-power signal monitoring circuit proposed in this embodiment has the following positive effects.

[0051] First, the ultra-wideband high-power signal monitoring circuit proposed in this embodiment is an ultra-wideband extremely low dissipation and high-efficiency circuit. Traditional circulators and isolators cannot cover the ultra-wideband bandwidth of 2GHz to 18GHz, and connecting them in series in the RF transmission circuit will directly affect the final power output and synthesis efficiency. The method of coupling the reflected microwave signal of the RF main signal with the monitoring and comparison circuit using the same-plane coupling circuit of the main signal circuit is difficult to solve the problem that the real-time judgment threshold cannot be determined due to the large fluctuations of the RF signal coupled by the ultra-wideband circuit. The real-time monitoring and comparison circuit of the positive reflection signal of the RF main signal adopted in this embodiment can well avoid the above problems, and the spatial coupling method of the directional coupler has little effect on the output power of the main signal, which greatly improves the efficient output of the ultra-wideband circuit.

[0052] Second, the ultra-wideband high-power signal monitoring circuit proposed in this embodiment is a miniaturized integrated design. The coupling circuit designed in this embodiment can directly output in the plane direction of the vertical power amplifier microwave transmission circuit. Compared with the traditional coupling form, it has the advantages of higher integration and easier processing.

[0053] Third, the manufacturing cost is low. The ultra-wideband high-power signal monitoring circuit proposed in this embodiment has strong feasibility, simple circuit, and mass production cost is much lower than other traditional high-power monitoring or protection circuit structures.

[0054] Fourth, it is scalable. In addition to real-time monitoring of the output power and protection of power devices from damage, the ultra-wideband high-power signal monitoring circuit proposed in this embodiment can also use double-side coupling to perform amplitude and phase correction of multi-channel power amplifiers. In addition, as an independent circuit structure, the monitoring circuit can be independently processed and flexibly disassembled, and can be flexibly selected as an extended function of the high-power amplifier.

[0055] In summary, the ultra-wideband high-power signal monitoring circuit proposed in this embodiment can output high and low levels by determining the level state, and automatically turn on or off the drain power supply of the high-power amplifier through logic determination. It has the advantages of simple circuit topology design, simple manufacturing process, flexible disassembly, relatively wide operating frequency bandwidth, and relatively small insertion loss.

[0056] It is worth mentioning that all modules involved in this embodiment are logic modules. In practical applications, a logic unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed by this application, but this does not mean that there are no other units in this embodiment.

[0057] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. An ultra-wideband high-power signal monitoring circuit, characterized in that: include: A high power amplifier, used for receiving an input microwave signal and outputting the input microwave signal at a high power saturation to a power input end of the directional coupler; A directional coupler is used to receive an input microwave radio frequency signal input by a high-power amplifier, directly transmit it to a saturated power output terminal for output to an antenna, and couple the input microwave radio frequency signal to a forward power coupling output terminal for output to an attenuation matching module through power coupling, and couple the output reflected microwave radio frequency signal corresponding to the input microwave radio frequency signal to a reflected power coupling output terminal for output to an attenuation matching module through power coupling; An attenuation matching module is used to receive a coupled signal of an input microwave radio frequency signal and output a coupled signal of a reflected microwave radio frequency signal, match a high-power coupled signal using a microwave circuit, and use a microwave attenuator to attenuate the matched signal to a preset power range for output; The detection module is used to receive the coupled signal of the input microwave radio frequency signal with good matching attenuation, and the coupled signal of the output reflected microwave radio frequency signal with good matching attenuation, and use the detection circuit to convert the radio frequency signal into a DC voltage signal, and match and output it to the operational amplifier module; The operational amplifier module is used to receive the DC voltage signal of the input microwave radio frequency signal and output the DC voltage signal of the reflected microwave radio frequency signal, and according to the voltage difference of different frequency points, the voltage values ​​of different frequency points are matched and amplified for output; The comparison unit is used to receive the DC voltage signal output by the operational amplifier module and the threshold signal output by the control circuit, and use the comparison circuit to convert the DC voltage signal of the input microwave radio frequency signal after operational amplification and the DC voltage signal of the reflected microwave radio frequency signal after operational amplification into a standing wave ratio, and compare them with the threshold value in the threshold signal. If the standing wave ratio is less than the threshold value, a low level is output for the control circuit to keep the drain power supply of the high power amplifier turned on. If the standing wave ratio is greater than or equal to the threshold value, a high level is output for the control circuit to shut down the drain power supply of the high power amplifier.

2. The ultra-wideband high-power signal monitoring circuit according to claim 1, characterized in that: The attenuation matching module is composed of a first attenuation matching unit and a second attenuation matching unit, the first attenuation matching unit is connected to the forward power coupling output end of the directional coupler, and the second attenuation matching unit is connected to the reflected power coupling output end of the directional coupler; The first attenuation matching unit is used to receive the coupled signal of the input microwave radio frequency signal, match the coupled signal of the input microwave radio frequency signal by using the microwave circuit, and use the microwave attenuator to rated attenuate the matched signal to within a preset power range and output it to the detection module; The second attenuation matching unit is used to receive the coupled signal of the output reflected microwave radio frequency signal, use the microwave circuit to match the coupled signal of the output reflected microwave radio frequency signal, and use the microwave attenuator to attenuate the matched signal to a preset power range and output it to the detection module.

3. The ultra-wideband high-power signal monitoring circuit according to claim 2, characterized in that: The preset power range is 0dBm to 10dBm.

4. The ultra-wideband high-power signal monitoring circuit according to claim 2, characterized in that: The detection module is composed of a first detection unit and a second detection unit, the first detection unit is connected to the first attenuation matching unit, and the second detection unit is connected to the second attenuation matching unit; The first detection unit is used to use a detection circuit to convert the coupled signal of the matched attenuated input microwave radio frequency signal into a DC voltage signal, and output it to the operational amplifier module in a matched manner; The second detection unit is used to convert the coupled signal of the output reflected microwave radio frequency signal with good matching attenuation into a DC voltage signal by using a detection circuit, and match and output it to the operational amplifier module.

5. The ultra-wideband high-power signal monitoring circuit according to claim 4, characterized in that: The operational amplifier module is composed of a first operational amplifier and a second operational amplifier, the first operational amplifier is connected to the first detection unit, and the second operational amplifier is connected to the second detection unit; The first operational amplifier is used to receive the DC voltage signal of the input microwave radio frequency signal, and according to the voltage difference of the DC voltage signal of the input microwave radio frequency signal at different frequency points, amplify and output the voltage values ​​at different frequency points; The second operational amplifier is used to receive the DC voltage signal of the output reflected microwave radio frequency signal, and according to the voltage difference of different frequency points of the DC voltage signal of the output reflected microwave radio frequency signal, match and amplify the voltage values ​​at different frequency points for output.

6. An ultra-wideband high-power signal monitoring circuit according to any one of claims 1 to 5, characterized in that: The bandwidth coverage of the directional coupler is from 2GHz to 18GHz, the passband loss is less than 1dB, the coupling degree is 40±2dB, the directivity is greater than 15dB, and the standing wave ratio is not greater than 2.

7. An ultra-wideband high-power signal monitoring circuit according to any one of claims 1 to 5, characterized in that: The circuit structure of the directional coupler adopts a suspended strip line type, and realizes real-time monitoring of the RF signal through air coupling in the direction perpendicular to the high-power RF main signal circuit.

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