Ultra-wideband high-power signal monitoring circuit

Abstract

Embodiments of the present application relate to the technical field of ultra-wideband high-power transmission, and in particular to an ultra-wideband high-power signal monitoring circuit, comprising: a high-power amplifier, a directional coupler, an attenuation matching module, a detection module, an operational amplifier module, and a comparison unit. In the monitoring circuit, an input microwave radio-frequency signal from the high-power amplifier and a corresponding reflected microwave radio-frequency signal are separately coupled on the basis of the directional coupler, undergo attenuation matching and detection, respectively, and then enter the comparison unit; the input microwave radio-frequency signal and the reflected microwave radio-frequency signal are converted into a standing wave ratio, and the standing wave ratio is compared with a threshold; if the standing wave ratio is less than the threshold, low-level output is performed, allowing a 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, high-level output is performed, allowing the control circuit to turn off the drain power supply of the high-power amplifier, thereby avoiding damage to the high-power amplifier due to high-power reflection.

Description

An ultra-wideband high-power signal monitoring circuit Technical Field

[0001] The embodiments of this application relate to the field of ultra-wideband high-power transmission technology for electronic information systems, and particularly to an ultra-wideband high-power signal monitoring circuit. Background Technology

[0002] In recent years, with the rapid development of electronic information systems and EMC (Electromagnetic Compatibility) testing, the demand for high-performance, high-power interference transmission systems has been increasing. Currently, solid-state power amplifiers synthesized from solid-state devices, which possess significant advantages such as large bandgap, high saturation electron deflection velocity, and high breakdown electric field strength, are gradually being applied to transmission systems. To achieve ultra-wideband high transmit power in transmission systems, 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] Traditional methods to improve the reliability of power amplifiers involve adding circulators or isolators at the output end, as shown in Figure 1. The biggest problem with this approach is the difficulty in finding ultra-wideband circulators or isolators covering 2GHz to 18GHz, and the large size and insertion loss of these devices directly affect the output power of solid-state power amplifiers and the synthesis efficiency of power amplification devices. Another approach is the design of a broadband high-power protection circuit, as shown in Figure 2. This method uses a planar coupling circuit to directionally couple the reflected microwave signal from the main RF signal through a coupling unit. After matching, amplification, detection, and comparison, the signal is sent to the control unit. The power supply circuit determines the level based on the standing wave ratio (SWR) of the control unit and takes appropriate measures. The biggest problem with this method is the large fluctuations in the coupled RF signal, making it impossible to determine the real-time threshold. Furthermore, the coupling circuit occupies planar space in the power amplifier, affecting its integration level. In addition, electromagnetic compatibility (EMC) issues are difficult to avoid, which can affect the electrical performance of the power amplifier. Summary of the Invention

[0004] In view of this, embodiments of this 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 by logic determination. It also has the advantages of simple circuit topology design, simple manufacturing process, flexible disassembly, wide operating frequency bandwidth and low insertion loss.

[0005] To achieve the above objectives, embodiments of this application propose an ultra-wideband high-power signal monitoring circuit. The monitoring circuit includes: a high-power amplifier for receiving an input microwave signal and outputting the input microwave signal at high power saturation to the power input terminal of a directional coupler; a directional coupler for receiving the input microwave radio frequency signal from the high-power amplifier, transmitting it directly to the saturated power output terminal for output to an antenna, and power-coupled the input microwave radio frequency signal to the forward power coupling output terminal for output to an attenuation matching module, and power-coupled the corresponding output reflected microwave radio frequency signal to the reflected power coupling output terminal for output to the attenuation matching module; an attenuation matching module for receiving the coupling signal of the input microwave radio frequency signal and the coupling signal of the output reflected microwave radio frequency signal, matching the high-power coupling signal using a microwave circuit, and attenuating the matched signal to a preset power range using a microwave attenuator; and a detection module for receiving the matched and attenuated input microwave radio frequency signal. The coupling signal of the input microwave RF signal and the coupling signal of the output reflected microwave RF signal with matching attenuation are converted into a DC voltage signal by a detection circuit and matched and output to the operational amplifier module. The operational amplifier module is used to receive the DC voltage signal of the input microwave RF signal and the DC voltage signal of the output reflected microwave RF signal. According to the voltage difference of different frequency points, the voltage values ​​of different frequency points are matched and amplified for output. The comparator unit is used to receive the DC voltage signal output by the operational amplifier module and the threshold signal output by the control circuit. The comparator circuit converts the DC voltage signal of the input microwave RF signal and the DC voltage signal of the operationally amplified microwave RF signal into a standing wave ratio (SWR) and compares it with the threshold value in the threshold signal. If the SWR is less than the threshold value, a low level output is output to keep the drain power supply of the high power amplifier on for the control circuit. If the SWR is greater than or equal to the threshold value, a high level output is output to turn off the drain power supply of the high power amplifier for the control circuit.

[0006] In some optional embodiments, the attenuation matching module consists 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 terminal of the directional coupler, and the second attenuation matching unit is connected to the reflected power coupling output terminal of the directional coupler. The first attenuation matching unit is used to receive the coupling signal of the input microwave radio frequency signal, match the coupling signal of the input microwave radio frequency signal using a microwave circuit, and attenuate the matching signal to a preset power range using a microwave attenuator before outputting it to the detection module. The second attenuation matching unit is used to receive the coupling signal of the output reflected microwave radio frequency signal, match the coupling signal of the output reflected microwave radio frequency signal using a microwave circuit, and attenuate the matching signal to a preset power range using a microwave attenuator before outputting 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 consists of a first detection unit and a second detection unit. The first detection unit is connected to a first attenuation matching unit, and the second detection unit is connected to a second attenuation matching unit. The first detection unit is used to convert the coupled signal of the attenuated input microwave radio frequency signal into a DC voltage signal using a detection circuit, and outputs it to the operational amplifier module. The second detection unit is used to convert the coupled signal of the attenuated output reflected microwave radio frequency signal into a DC voltage signal using a detection circuit, and outputs it to the operational amplifier module.

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

[0010] In some optional embodiments, the directional coupler has a bandwidth range of 2 GHz to 18 GHz, a passband loss of less than 1 dB, a coupling degree of 40 ± 2 dB, a directivity of greater than 15 dB, and a standing wave ratio of no more than 2.

[0011] In some alternative embodiments, the circuit structure of the directional coupler adopts a suspended strip-wire type, which realizes real-time monitoring of radio frequency signals through air coupling in the 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, the ultra-wideband high-power signal monitoring circuit proposed in this application is an ultra-wideband, extremely low-dissipation, high-efficiency circuit. Traditional circulators and isolators cannot cover the ultra-wideband bandwidth of 2GHz to 18GHz, and their series connection into the RF transmission circuit directly affects the final power output and combining efficiency. The method of using a planar side-coupled circuit of the main signal circuit to couple and monitor the reflected microwave signal of the RF main signal is difficult to solve the problem that the large fluctuations of the coupled RF signal in the ultra-wideband circuit make it impossible to determine the real-time judgment threshold. The real-time monitoring and comparison circuit of the positive reflection signal of the RF main signal used in this application can effectively avoid the above problems, and the spatial coupling method of the directional coupler has minimal impact on the output power of the main signal, greatly improving the high-efficiency output of the ultra-wideband circuit.

[0014] Secondly, 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 output directly in the plane direction of the vertical power amplifier microwave transmission circuit, which has advantages such as higher integration and easier processing compared to traditional coupling methods.

[0015] Third, the manufacturing cost is low. The ultra-wideband high-power signal monitoring circuit proposed in this application is highly feasible, has a simple circuit, and its mass production manufacturing cost is far lower than that of other traditional high-power monitoring or protection circuit structures.

[0016] Fourth, it is scalable. The ultra-wideband high-power signal monitoring circuit proposed in this application, in addition to real-time monitoring of output power and real-time protection of power devices from damage, can also perform amplitude and phase correction of multi-channel power amplifiers using dual-sided coupling. Furthermore, as an independent circuit structure, this monitoring circuit can be independently fabricated and flexibly disassembled, allowing for flexible selection and use as an extension function of high-power amplifiers.

[0017] In summary, the ultra-wideband high-power signal monitoring circuit proposed in this 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 by logic determination. It has the advantages of simple circuit topology design, simple manufacturing process, flexible disassembly, wide operating frequency bandwidth and low insertion loss. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 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 is a circuit diagram of a power amplifier real-time monitoring and protection circuit based on planar directional coupling;

[0021] Figure 3 is a circuit diagram of an ultra-wideband high-power signal monitoring circuit provided in one embodiment of this application;

[0022] Figure 4 is a circuit diagram of an ultra-wideband high-power signal monitoring circuit provided in one embodiment of this application;

[0023] Figure 5 is a circuit diagram of a directional coupler provided in one embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. In the various embodiments of this application, many technical details are presented to enable the reader to better understand this application. However, even without these technical details and various variations and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented. The division of the following embodiments is only for convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0025] One embodiment of this 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 described in detail below. The following implementation details are provided for ease of understanding and are not necessary for implementing this solution.

[0026] The circuit principle of the ultra-wideband high-power signal monitoring circuit proposed in this embodiment is shown in Figures 3 and 4. 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 comparator 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 comparator unit 60.

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

[0028] The standing wave ratio (VSWR) is a measure of the propagation of microwave signals on a transmission line, and it is defined as: VSWR=(1+|Γ|) / (1-|Γ|).

[0029] Wherein, Γ is the reflection coefficient, defined as the ratio of the voltage or current of the reflected signal to the incident signal.

[0030] The following is a detailed description of each component in the monitoring circuit.

[0031] The high-power amplifier 10 is used to receive the input microwave signal, amplify the power of the received input microwave signal, and thus output the input microwave signal at high power saturation to the power input terminal 21 of the directional coupler 20.

[0032] The directional coupler 20 is used to receive the input microwave radio frequency signal from the high-power amplifier 10, transmit it directly to the saturated power output terminal 22 to output to the antenna 70, and power couple the input microwave radio frequency signal to the forward power coupling output terminal 23 to output to the attenuation matching module 30. It also power reflects the input microwave radio frequency signal to obtain the corresponding output reflected microwave radio frequency signal, and power couples the output reflected microwave radio frequency signal to the reflected power coupling output terminal 24 to output to the attenuation matching module 30.

[0033] The circuit principle of the directional coupler is shown in Figure 5. The directional coupler adopts a suspended strip-wire type circuit structure, achieving real-time monitoring of the RF signal through air coupling perpendicular to the high-power RF main signal circuit. This suspended strip-wire type directional coupler, through air coupling perpendicular to the high-power RF main signal circuit, achieves high isolation and real-time reception of the RF output signal and the transmitted signal without affecting the transmission of the high-power RF main signal. Such a directional coupler features a simple circuit topology design, easy manufacturing process, flexible disassembly, a relatively wide operating frequency bandwidth, and relatively low insertion loss.

[0034] The performance specifications of the directional coupler are as follows: bandwidth coverage from 2GHz to 18GHz, passband loss less than 1dB, coupling strength of 40±2dB, directivity greater than 15dB, and VSWR not greater than 2. A directional coupler possessing these performance specifications can guarantee forward and reverse power coupling detection while meeting output power requirements.

[0035] The attenuation matching module 30 is used to receive the coupling signal of the input microwave radio frequency signal and the coupling signal of the output reflected microwave radio frequency signal, use microwave circuits to match the high-power coupling signal, and use a microwave attenuator to attenuate the matching signal to the preset power range for output.

[0036] As shown in Figure 4, 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 terminal 23 of the directional coupler 20, and the second attenuation matching unit 32 is connected to the reflected power coupling output terminal 24 of the directional coupler 20.

[0037] The first attenuation matching unit 31 is used to receive the coupling signal of the input microwave radio frequency signal, match the coupling signal of the input microwave radio frequency signal using a microwave circuit, and use a microwave attenuator to attenuate the matching signal to a preset power range (generally designed to be 0dBm to 10dB) and output it to the detection module 40.

[0038] The second attenuation matching unit 32 is used to receive the coupling signal of the output reflected microwave radio frequency signal, use microwave circuit to match the coupling signal of the output reflected microwave radio frequency signal, and use microwave attenuator to attenuate the matching signal to a preset power range (generally designed to be 0dBm to 10dB) and output it to the detection module 40.

[0039] The detector module 40 is used to receive the coupled signal of the input microwave radio frequency signal with matching attenuation and the coupled signal of the output reflected microwave radio frequency signal with matching attenuation. Using the detector circuit, both radio frequency signals are converted into DC voltage signals (also known as video signals or video voltage signals) and matched and output to the operational amplifier module 50.

[0040] As shown in Figure 4, the detection module 40 consists 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.

[0041] The first detection unit 41 is used to convert the coupled signal of the well-matched and attenuated input microwave radio frequency signal into a DC voltage signal using a detection circuit, and output it to the operational amplifier module 50.

[0042] The second detection unit 42 is used to convert the coupled signal of the well-matched and attenuated output reflected microwave radio frequency signal into a DC voltage signal using a detection circuit, and then output it to the operational amplifier module 50.

[0043] The operational amplifier module 50 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. Based on the voltage difference between the two DC voltage signals at different frequency points, it matches and amplifies the voltage values ​​at different frequency points and outputs them (to the comparison unit 60).

[0044] As shown in Figure 4, the operational amplifier module 50 consists 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.

[0045] The first operational amplifier 51 is used to receive the DC voltage signal of the input microwave radio frequency signal, and to match and amplify the voltage values ​​at different frequency points according to the voltage difference of the DC voltage signal of the input microwave radio frequency signal.

[0046] The second operational amplifier 52 is used to receive the DC voltage signal of the output reflected microwave radio frequency signal, and to match and amplify the voltage values ​​at different frequency points according to the voltage difference of the DC voltage signal of the output reflected microwave radio frequency signal.

[0047] The comparator unit 60 receives the DC voltage signal output from the operational amplifier module 50 and the threshold signal output from the control circuit. The comparator circuit converts the DC voltage signal of the operationally amplified input microwave RF signal and the DC voltage signal of the operationally amplified reflected microwave RF signal into a standing wave ratio (SWR), and compares it with the threshold value in the threshold signal. If the SWR is less than the threshold value, a low-level output is provided to keep the drain power supply of the high-power amplifier on for the control circuit. If the SWR is greater than or equal to the threshold value, a high-level output is provided to turn off the drain power supply of the high-power amplifier for the control circuit, thereby preventing the high-power amplifier from being damaged due to high-power reflection.

[0048] After processing by a directional coupler, attenuation matching module, detection module, operational amplifier module, and comparator unit, the problem of high active standing wave ratio (VSWR) causing high-power amplifiers to reflect power and damage the chip during operation is monitored in real time. When the reflected power reaches the judgment threshold, the drain power supply of the high-power amplifier is promptly cut off, thus protecting the high-power amplifier from damage. This circuit structure is suitable for real-time monitoring of RF signals from narrowband and ultra-wideband high-power amplifiers (devices). It cleverly utilizes the high symmetry of a highly directional coupler to achieve high isolation coupling between the high-power input RF signal and the transmitted signal at the same frequency, avoiding the problem of indeterminate real-time judgment thresholds caused by large broadband signal fluctuations in traditional coupling circuits.

[0049] The ultra-wideband high-power signal monitoring circuit proposed in this embodiment has the following positive effects.

[0050] 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 their series connection into the RF transmission circuit directly affects the final power output and combining efficiency. The method of using a planar side-coupled circuit of the main signal circuit to couple and monitor the reflected microwave signal of the RF main signal is difficult to solve the problem that the large fluctuations of the coupled RF signal in the ultra-wideband circuit make it impossible to determine the real-time judgment threshold. The real-time monitoring and comparison circuit of the positive reflection signal of the RF main signal used in this embodiment can effectively avoid the above problems, and the spatial coupling method of the directional coupler has minimal impact on the output power of the main signal, greatly improving the high-efficiency output of the ultra-wideband circuit.

[0051] Secondly, 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 output directly in the plane direction of the vertical power amplifier microwave transmission circuit, which has advantages such as higher integration and easier processing compared to traditional coupling methods.

[0052] Third, the manufacturing cost is low. The ultra-wideband high-power signal monitoring circuit proposed in this embodiment is highly feasible, the circuit is simple, and the mass production manufacturing cost is far lower than that of other traditional high-power monitoring or protection circuit structures.

[0053] Fourth, it is scalable. The ultra-wideband high-power signal monitoring circuit proposed in this embodiment can not only monitor the output power in real time and protect power devices from damage, but also perform amplitude and phase correction of multi-channel power amplifiers using dual-sided coupling. Furthermore, as an independent circuit structure, this monitoring circuit can be independently fabricated and flexibly disassembled, allowing for flexible selection as an extension function of the high-power amplifier.

[0054] 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 by logic determination. It has the advantages of simple circuit topology design, simple manufacturing process, flexible disassembly, wide operating frequency bandwidth and low insertion loss.

[0055] It is worth mentioning that all modules involved in this embodiment are logical modules. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed in this application; however, this does not mean that other units are absent in this embodiment.

[0056] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A high-power, ultra-wideband signal monitoring circuit, characterized in that, include: A high-power amplifier is used to receive the input microwave signal and output the input microwave signal at high power saturation to the power input terminal of the directional coupler. A directional coupler is used to receive the input microwave radio frequency signal from a high-power amplifier, transmit it directly to the saturated power output terminal for output to the antenna, and couple the input microwave radio frequency signal to the forward power coupling output terminal for output to the attenuation matching module. It also couples the output reflected microwave radio frequency signal corresponding to the input microwave radio frequency signal to the reflected power coupling output terminal for output to the attenuation matching module. The attenuation matching module is used to receive the coupling signal of the input microwave radio frequency signal and the coupling signal of the output reflected microwave radio frequency signal. It uses microwave circuits to match the high-power coupling signal and uses a microwave attenuator to attenuate the matching signal to the preset power range for output. The detection module is used to receive the coupled signal of the well-matched and attenuated input microwave radio frequency signal, as well as the coupled signal of the well-matched and attenuated output reflected microwave radio frequency signal. The detection circuit converts the radio frequency signal into a DC voltage signal and outputs 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 the DC voltage signal of the output reflected microwave radio frequency signal. Based on the voltage difference at different frequency points, it matches and amplifies the voltage values ​​at different frequency points for output. The comparator unit receives the DC voltage signal output from the operational amplifier module and the threshold signal output from the control circuit. The comparator circuit converts the DC voltage signals of the operationally amplified input microwave RF signal and the operationally amplified reflected microwave RF signal into a standing wave ratio (SWR), and compares it with the threshold value in the threshold signal. If the SWR is less than the threshold value, a low-level output is provided to keep the drain power supply of the high-power amplifier on for the control circuit. If the SWR is greater than or equal to the threshold value, a high-level output is provided to turn off the drain power supply of the high-power amplifier for the control circuit.

2. The ultra-wideband high-power signal monitoring circuit according to claim 1, characterized in that, The attenuation matching module consists 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 terminal of the directional coupler, and the second attenuation matching unit is connected to the reflected power coupling output terminal of the directional coupler. The first attenuation matching unit is used to receive the coupling signal of the input microwave radio frequency signal, match the coupling signal of the input microwave radio frequency signal using a microwave circuit, and attenuate the matching signal to a preset power range using a microwave attenuator before outputting it to the detection module. The second attenuation matching unit is used to receive the coupling signal of the output reflected microwave radio frequency signal, use microwave circuits to match the coupling signal of the output reflected microwave radio frequency signal, and use a microwave attenuator to attenuate the matching signal to a preset power range before outputting 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 consists 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 convert the coupled signal of the well-matched and attenuated input microwave radio frequency signal into a DC voltage signal using a detection circuit, and output it to the operational amplifier module. The second detection unit is used to convert the coupled signal of the well-matched and attenuated output reflected microwave radio frequency signal into a DC voltage signal using a detection circuit, and then 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 consists 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 to match and amplify the voltage values ​​at different frequency points according to the voltage difference of the DC voltage signal of the input microwave radio frequency signal. The second operational amplifier is used to receive the DC voltage signal of the output reflected microwave radio frequency signal, and to match and amplify the voltage values ​​at different frequency points according to the voltage difference of the DC voltage signal of the output reflected microwave radio frequency signal.

6. A high-power ultra-wideband signal monitoring circuit according to any one of claims 1 to 5, characterized in that, The directional coupler has a bandwidth range of 2GHz to 18GHz, a passband loss of less than 1dB, a coupling degree of 40±2dB, a directivity of greater than 15dB, and a standing wave ratio of no more than 2.

7. A high-power ultra-wideband 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 wire type, and real-time monitoring of radio frequency signals is achieved through air coupling in the direction of the high-power radio frequency main signal circuit.

Images