High-power microwave electromagnetic sensitivity test device and method
By designing a high-power microwave electromagnetic sensitivity test device containing an adjustable attenuator and a wave absorbing material, the problems of difficult handling, low measurement accuracy and poor repeatability of equipment for high-power microwave radiation testing in the prior art are solved. The adjustable output and electromagnetic shielding of high-power microwaves are realized, improving measurement accuracy and repeatability.
Patent Information
- Application Number
- CN202411521588.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-02-07
AI Technical Summary
During existing high-power microwave radiation tests, the equipment is difficult to carry, the measurement accuracy is low, and the repeatability is poor.
A high-power microwave electromagnetic sensitivity test device is designed, including a shielded test chamber and a shielded control chamber. Using adjustable attenuators and absorbent materials, the adjustable output and electromagnetic shielding of high-power microwaves are achieved.
The high power is adjusted through an adjustable attenuator, and step 1dB power adjustment in the range of 0-1114W is achieved, which improves measurement accuracy and repeatability and reduces the difficulty of equipment handling.
Smart Images
Figure CN119395397A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of high-power microwave electromagnetic effect and electromagnetic compatibility testing, and in particular relates to a high-power microwave electromagnetic sensitivity test device and method. Background Art
[0002] At present, when conducting high-power microwave irradiation test in an open field environment, since the output power of the source of the existing high-power microwave irradiation system cannot be adjusted, for different devices under test, it is necessary to adjust the distance between the transmitting antenna of the high-power microwave irradiation system and the device under test to achieve the test power required by the device under test. The equipment is difficult to carry, and the measurement accuracy is low and the repeatability is poor. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a high-power microwave electromagnetic sensitivity test device and method to solve the technical problems of the prior art high-power microwave irradiation test, such as the difficulty in equipment transportation, low measurement accuracy, and poor repeatability.
[0004] Technical solution of the present invention: A high-power microwave electromagnetic sensitivity test device, comprising a shielding test cabin and a shielding control cabin, wherein a receiving antenna is fixed on a shell at the top of the shielding test cabin, a transmitting antenna and a field strength probe are fixed in the shielding test cabin, the receiving antenna is connected to an adjustable attenuator, the adjustable attenuator is connected to a directional coupler, a first output of the directional coupler is connected to a first detector (4), the first detector is connected to a pulse power meter, a second output of the directional coupler is connected to the transmitting antenna, the field strength probe is connected to a second detector, and the second detector is connected to the pulse power meter.
[0005] The shielding test cabin and the shielding control cabin are fixedly connected side by side; the shielding test cabin and the shielding control cabin are both composed of metal shells, and the inside of the shielding test cabin is covered with absorbing materials.
[0006] The absorbing material is in a wedge shape.
[0007] The receiving antenna is fixed by antenna fixture A; the transmitting antenna is fixed by antenna fixture B; the field strength probe is fixed by probe fixture C, and the field strength probe is aimed at the transmitting antenna.
[0008] The adjustable attenuator, the directional coupler, the first detector, the pulse power meter and the second detector are located inside the shielded control cabin.
[0009] A test method for a high-power microwave electromagnetic sensitivity test device, the method comprising: Step 1: Align the receiving antenna with the main lobe of the high-power microwave and align the transmitting antenna with the field strength probe; Step 2: Adjust the attenuation range of the adjustable attenuator from high to low, use a pulse power meter to monitor the power value received at the position of the field intensity probe in real time, calibrate the power at the position of the field intensity probe, and then fix the posture of the receiving and transmitting antennas; Step 3, fix the device under test at the position of the field strength probe, and adjust the adjustable attenuator according to the power data calibrated in step 2 to achieve the required power at the device under test; Step 4: Conduct the test according to the test outline.
[0010] Beneficial effects of the present invention: The present invention adjusts the received high power through an adjustable attenuator, and uses a shielded dark box to perform electromagnetic shielding. For equivalent radiation power below 1114W, the equivalent radiation power can be adjusted in a step of 1dB within the range of 0-1114W.
[0011] The power of high-power microwaves can be adjusted by the present invention, the adjustment range can reach 0-1114W, and the repeatability error can be within 1%.
[0012] The present invention can utilize a dark box structure with wave-absorbing materials to simulate an infinitely distant external field environment; the present invention can utilize an adjustable attenuator to achieve adjustable equivalent radiation power inside the dark box.
[0013] The problem that the output power of the source of the existing high-power microwave irradiation system cannot be adjusted is solved. For different devices under test, the distance between the transmitting antenna of the high-power microwave irradiation system and the device under test needs to be adjusted to achieve the test power required by the device under test. The equipment is difficult to carry, and the measurement accuracy is low and the repeatability is poor. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is the front view of the test device; Figure 2 This is the front view of the shielding dark box; Figure 3 The block diagram of the experimental test system is shown in Figure 1. Among them: 1-receiving antenna, 2-adjustable attenuator, 3-directional coupler, 4-first detector, 5-pulse power meter, 6-shielded control cabin, 7-second detector, 8-transmitting antenna, 9-field strength probe, 10-absorbing material, 11-shielded test cabin, A-antenna fixture, B-antenna fixture, C-probe fixture. DETAILED DESCRIPTION
[0015] A high-power microwave electromagnetic sensitivity test device and method, the test device comprises a transceiver, a shielding dark box and a measuring device; The shielding dark box includes a shielding test cabin 11, an absorbing material 10, and a shielding control cabin 6; the shielding dark box is divided into two left and right areas, the left area is the shielding test cabin 11, and the right area is the shielding control cabin 6; the shielding test cabin 11 and the shielding control cabin 6 are fixedly connected side by side; the shielding test cabin 11 and the shielding control cabin 6 are both composed of metal shells; through holes are reserved on the shielding control cabin and the shielding test cabin for connecting cables to pass through; the absorbing material 10 is tightly attached to and covers the inner side of the test cabin 11; the absorbing material 10 is in a wedge shape, and the advantages of using the wedge-shaped absorbing material are: wide absorption frequency band and good absorption effect.
[0016] The transceiver device includes a receiving antenna 1, an adjustable attenuator 2, a transmitting antenna 8, an antenna clamp A and an antenna clamp B; the receiving antenna 1 is fixed to the top of the outer shell of the shielding test cabin 11 by the antenna clamp A; the adjustable attenuator 2 is located inside the shielding control cabin 6; the transmitting antenna 8 is fixed in the shielding test cabin 11 by the antenna clamp B.
[0017] The measuring device includes a directional coupler 3, a first detector 4, a pulse power meter 5, a second detector 7, and a field strength probe 9; the directional coupler 3 and the pulse power meter 5 are located inside the shielding control cabin 6; the first detector 4 and the second detector 7 are connected to the front ends of two channels of the pulse power meter 5 in the shielding control cabin 6; the field strength probe 9 is placed inside the shielding test cabin 11 and is aligned with the transmitting antenna 8.
[0018] The method for using the high-power microwave electromagnetic sensitivity test device comprises: Step 1: Align the receiving antenna of the test device with the main lobe of the high-power microwave, and align the transmitting antenna of the test device with the field intensity probe, which is connected to the pulse power meter outside the dark box; Step 2: Adjust the attenuation range of the adjustable attenuator from high to low, use the pulse power meter to monitor the power received at the location of the field strength probe in real time, and calibrate the power at the location of the field strength probe. Then fix the posture of the receiving and transmitting antennas; Step 3: Use a fixture to fix the device under test at the position of the field strength probe, and adjust the adjustable attenuator according to the power data calibrated in step 2 to achieve the required power at the device under test; Step 4: Conduct the test according to the test outline.
[0019] The working principle of the present invention is as follows: the high-power microwave pulse signal in space is received by the receiving antenna 1, and the high-power microwave pulse signal is attenuated by the adjustable attenuator 2 and then transmitted to the directional coupler 3. The function of the adjustable attenuator 2 is to attenuate according to the demand to generate the required field strength in the shielding test cabin 11; the signal after the directional coupler 3 is divided into two paths, the first path is the signal coupled out by the coupling end of the directional coupler 3, and then transmitted to the pulse power meter 5 after being detected by the first detector. The main function of the first detector is to extract the original information signal (baseband signal) from the modulated high-frequency carrier signal. The transmission link is used to monitor the original information of the high-power microwave pulse signal; the second path is transmitted to the transmitting antenna 8 inside the shielding test cabin 11 through the through end of the directional coupler 3. The transmitting antenna 8 sends the signal to the inside of the shielding test cabin 11, and the field strength probe 9 measures the magnitude of the field strength inside the shielding test cabin 11, and then the signal is transmitted to the pulse power meter 5 through the second detector to monitor the electromagnetic environment in the shielding test cabin. The function of the second detector is the same as that of the first detector.
Claims
1. A high power microwave electromagnetic sensitivity test device, characterized in that: The device comprises a shielding test cabin (11) and a shielding control cabin (6); a receiving antenna (1) is fixed on a shell at the top of the shielding test cabin (11); a transmitting antenna (8) and a field strength probe (9) are fixed in the shielding test cabin (11); the receiving antenna (1) is connected to an adjustable attenuator (2); the adjustable attenuator (2) is connected to a directional coupler (3); a first output of the directional coupler (3) is connected to a first detector (4); the first detector (4) is connected to a pulse power meter (5); a second output of the directional coupler (3) is connected to the transmitting antenna (8); the field strength probe (9) is connected to a second detector (7); and the second detector (7) is connected to the pulse power meter (5).
2. A high-power microwave electromagnetic susceptibility test device according to claim 1, characterized in that: The shielding test cabin (11) and the shielding control cabin (6) are fixedly connected side by side; the shielding test cabin (11) and the shielding control cabin (6) are both composed of metal shells, and the inside of the shielding test cabin (11) is covered with wave-absorbing materials (10).
3. A high-power microwave electromagnetic susceptibility test device according to claim 2, characterized in that: The wave absorbing material (10) is in a wedge shape.
4. A high power microwave electromagnetic susceptibility test device according to claim 1, characterized in that: The receiving antenna (1) is fixed by an antenna fixture A; the transmitting antenna (8) is fixed by an antenna fixture B; the field intensity probe (9) is fixed by a probe fixture C, and the field intensity probe (9) is aligned with the transmitting antenna (8).
5. A high-power microwave electromagnetic susceptibility test device according to claim 1, characterized in that: The adjustable attenuator (2), the directional coupler (3), the first detector (4), the pulse power meter (5) and the second detector (7) are located inside the shielded control cabin (6).
6. The test method of a high power microwave electromagnetic sensitivity test device according to claim 1, characterized in that: The method comprises: Step 1: Align the receiving antenna with the main lobe of the high-power microwave and align the transmitting antenna with the field strength probe; Step 2: Adjust the attenuation range of the adjustable attenuator from high to low, use a pulse power meter to monitor the power value received at the position of the field intensity probe in real time, calibrate the power at the position of the field intensity probe, and then fix the posture of the receiving and transmitting antennas; Step 3, fix the device under test at the position of the field strength probe, and adjust the adjustable attenuator according to the power data calibrated in step 2 to achieve the required power at the device under test; Step 4: Conduct the test according to the test outline.