EMC electromagnetic compatibility testing device and method

Abstract

The invention provides an EMC electromagnetic compatibility testing device and method, and relates to the field of electromagnetic testing, and the device comprises a testing chamber, an antenna assembly, a rotating table, a clamping part, a regulation and control board, and a spectrum analyzer. The top of the rotating table is provided with a clamping piece and a regulation and control plate, the center connecting line of the regulation and control plate and the clamping piece passes through the rotating center of the rotating table, and the regulation and control plate is used for reflecting electromagnetic radiation generated by an electronic product, so that radiation generated by a test electronic product installed on the clamping piece can be directly received by the antenna assembly. And the other direction can be reflected by the regulation and control board to serve as a second interference source to simulate an actual use environment, so that EMC electromagnetic compatibility data obtained by testing of the antenna assembly is more reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic product testing, specifically to the field of electromagnetic testing, and particularly to an EMC electromagnetic compatibility testing device and method. BACKGROUND

[0002] EMC electromagnetic compatibility testing is a test that simply checks whether an electronic and electrical device (referred to as a "test device") can work normally without interfering with other devices and being interfered by other devices in a common electromagnetic environment. CN119936525A discloses an EMC electromagnetic compatibility testing device, which includes a test cabinet composed of a rectangular cabinet body and a shielding door. The inside of the rectangular cabinet body is provided with a EMC detection mechanism for electromagnetic compatibility testing. The rectangular cabinet body and the shielding door are both provided with electromagnetic shielding mechanisms for avoiding electromagnetic leakage. The shielding door is provided with a signal receiving mechanism, and the rectangular cabinet body is provided with a safety protection mechanism for timely extinguishing open flames. The EMC detection mechanism includes a movable turntable arranged inside the rectangular cabinet body. By setting the EMC detection mechanism, the mutual cooperation between the movable turntable, the antenna assembly, and the test cabinet can quickly complete multi-directional electromagnetic compatibility testing in an electromagnetic shielding environment, effectively reducing the interference of other electromagnetic field sources in the environment, improving testing efficiency, and making the detection results more accurate. CN119716322A monitors the state and spatial position information of each device in real time, calculates the electromagnetic radiation intensity of the device, sorts all test tasks according to priority, arranges the devices for testing from high priority to low priority, forms an initial device scheduling scheme, calculates the electromagnetic interference gradient of the device scheduling scheme, dynamically adjusts the device scheduling order using the electromagnetic interference gradient, updates the device scheduling scheme, updates the electromagnetic interference intensity between devices in real time, and further dynamically evolves the device state interference matrix. The global coupling feedback is calculated. A multi-dimensional optimization objective function considering the total interference quantity under the current scheduling scheme, the device state interference matrix, and the global coupling feedback is solved to obtain the optimal device scheduling scheme. The scheduling efficiency is high, the resource utilization is sufficient, the electromagnetic interference control is accurate, and the complex multi-device collaborative testing demand can be effectively met.

[0003] The actual environment used by electronic products is complex, and the interference of the electromagnetic field generated thereby cannot be completely predicted. Conventional testing is based on the maximum interference and distance relationship to determine whether the electronic product meets the actual use requirements. The antenna simply acquires the interference signal emitted by the electronic product in the electromagnetic field, and the oscilloscope / spectrum analyzer is used to display the interference signal strength change. The reliability of the test results is insufficient, and the testing effect needs to be further improved. Therefore, the present application provides an EMC electromagnetic compatibility testing device and method. SUMMARY

[0004] In view of the deficiencies of the prior art, the EMC electromagnetic compatibility test device and method provided by the application solve the problem of the lack of reliability of test results of the conventional antenna that simply obtains the interference signal emitted by an electronic product in an electromagnetic field and displays the interference signal strength change using an oscilloscope / spectrum analyzer.

[0005] To achieve the above object, the application is implemented by the following technical solutions: An EMC electromagnetic compatibility test device comprises: A test chamber, the side of the test chamber is provided with a door body; A rotating table, the top of the rotating table is provided with a clamping piece and a control plate, the center line of the control plate and the clamping piece passes through the rotating center of the rotating table, and the control plate is used for reflecting the electromagnetic radiation generated by the electronic product; An antenna assembly, the antenna assembly is arranged on one side of the rotating table, and the antenna assembly is communicatively connected with a spectrum analyzer; The rotating table and the antenna assembly are arranged in the interior of the test chamber.

[0006] The application provides an EMC electromagnetic compatibility test device and method. 1. By arranging the clamping piece and the control plate at the two ends of the straight line passing through the center of the rotating table, the clamping piece, the control plate and the antenna assembly can be located on the same straight line under the control of the rotation of the rotating table, and the clamping piece is located between the control plate and the antenna assembly, so that the radiation generated by the test electronic product installed on the clamping piece can be directly accepted by the antenna assembly, and the radiation in another direction can be reflected by the control plate and used as a second interference source to simulate the actual use environment, so that the EMC electromagnetic compatibility data obtained by the antenna assembly is more reliable.

[0007] 2. The sliding table is pushed to slide along the slide of the guide table by the first telescopic piece, so that the distance between the antenna piece and the clamping piece (i.e. the position of the electronic product to be detected) is adjusted, so as to adapt to different test requirements. DETAILED DESCRIPTION

[0008] Figure 1 A perspective view of an EMC electromagnetic compatibility test device provided by the application; Figure 2 A front view of an EMC electromagnetic compatibility test device provided by the application; Figure 3 A perspective view of a rotating table, a clamping piece and a control plate of an EMC electromagnetic compatibility test device provided by the application; Figure 4 A front view of a rotating table, a clamping piece and a control plate of an EMC electromagnetic compatibility test device provided by the application; Figure 5A sectional view of the structure of a rotating table, a clamping piece, and a control plate of an EMC electromagnetic compatibility test device according to the present application; Figure 6 An installation position diagram of a clamping piece and a control plate of an EMC electromagnetic compatibility test device according to the present application; Figure 7 A perspective diagram of a clamping piece of an EMC electromagnetic compatibility test device according to the present application; Figure 8 A perspective diagram of a clamping cylinder assembly of an EMC electromagnetic compatibility test device according to the present application; Figure 9 A perspective diagram of a control plate of an EMC electromagnetic compatibility test device according to the present application; Figure 10 A perspective diagram of an antenna assembly of an EMC electromagnetic compatibility test device according to the present application.

[0009] 1, test chamber; 101, door body; 2, antenna assembly; 201, guide table; 202, first telescopic piece; 203, sliding table; 204, stand; 205, antenna piece; 3, rotating table; 301, pad plate; 302, mounting seat; 303, mounting table; 304, gland; 305, bearing table; 306, first gear; 307, rotating motor; 308, second gear; 309, cover disc; 3010, support frame; 3011, table top; 3011a, front square part; 3011b, rear square part; 3011c, sliding opening; 4, clamping piece; 401, first cylinder; 402, second cylinder; 403, wide band body; 404, elastic narrow band body; 405, positioning frame; 406, flat piece; 407, clamping cylinder; 408, push plate; 409, mounting frame; 5, control plate; 501, second telescopic piece; 502, sliding frame; 503, buckle plate frame; 504, reflection plate body assembly; 504a, main plate body; 504b, winding drum; 504c, unwinding drum; 504d, servo motor; 504e, pulley; 504f, synchronous belt; 504g, flexible reflection sheet; 6, spectrum analyzer. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0011] Embodiment one As Figure 1 - Figure 10As shown, the embodiment of the present application provides an EMC electromagnetic compatibility test device, which relates to the electronic product test direction and specifically belongs to the electromagnetic test field and is used for detecting electromagnetic radiation of electronic products and specifically comprises a test chamber 1, an antenna assembly 2, a rotating table 3, a clamping piece 4, a control plate 5 and a spectrum analyzer 6.

[0012] The test chamber 1 provides a space for shielding external interference and avoiding electromagnetic radiation of the electronic product to be detected from being conducted out of the test chamber 1 or reflected inside the test chamber 1, for example, the test chamber 1 is a metal box body, an electromagnetic absorbing layer is arranged inside the metal box body, the metal box body can shield (reflect) external electromagnetic interference, and the electromagnetic absorbing layer can absorb electromagnetic radiation of the electronic product to be detected.

[0013] The antenna assembly 2, the rotating table 3, the clamping piece 4 and the control plate 5 are arranged inside the test chamber 1, and the spectrum analyzer 6 is connected to the antenna assembly 2 in a conventional manner in a wired / wireless manner (for example, signal processing elements such as amplifiers, filters and converters are arranged on a line).

[0014] The rotating table 3 is provided with the clamping piece 4 and the control plate 5 on the top, the center line of the control plate 5 and the clamping piece 4 passes through the rotation center of the rotating table 3, the control plate 5 is used for reflecting electromagnetic radiation generated by the electronic product, simulating the interference condition of the electromagnetic radiation of the electronic product to be detected in the environment where a second group of electromagnetic signals coexist, so as to be more consistent with the actual use of the product, the antenna assembly 2 is arranged on one side of the rotating table 3, and the antenna assembly 2 is in communication connection with the spectrum analyzer 6, the antenna assembly 2 is used for detecting interference signals in a test environment and can display and record the interference signals through the spectrum analyzer 6.

[0015] In the present application, the clamping piece 4 and the control plate 5 are arranged at both ends of the straight line passing through the center of the rotating table, under the control of the rotation of the rotating table 3, the clamping piece 4, the control plate 5 and the antenna assembly 2 can be located on the same straight line, and the clamping piece 4 is located between the control plate and the antenna assembly 2, so that the radiation generated by the test electronic product installed on the clamping piece 4 can be directly accepted by the antenna assembly 2, and the radiation in another direction can be reflected by the control plate 5 and used as a second interference source to simulate the actual use environment, so that the EMC electromagnetic compatibility data obtained by the antenna assembly 2 is more reliable.

[0016] In the present application, the clamping piece 4 (that is, the electronic product to be tested on the clamping piece 4) and the control plate 5 are rotated based on the rotating table 3 to simulate electromagnetic interference in different directions, so that the EMC electromagnetic compatibility data obtained by the test is more reliable.

[0017] It is worth noting that: in addition to the electronic products to be detected, other devices and components in the test chamber 1 that may generate electromagnetic interference should be covered with an electromagnetic absorbing layer to avoid interference with the test.

[0018] In an embodiment, the rotating table 3 comprises a mounting seat 302, a bearing table 305, a rotating power component, and a table top 3011.

[0019] The bottom of the mounting seat 302 is fixedly connected with a backing plate 301, which is directly fixed to the floor of the test chamber 1. The mounting seat 302 is a ring-shaped cylinder, and the top end of the mounting seat 302 is open. A cover disc 309 is fixedly installed at the top end of the mounting seat 302. An installation table 303 is fixedly arranged at the inner bottom center of the mounting seat 302. The installation table 303 is annular. The bearing table 305 is rotatably installed on the inner side of the installation table 303 through a bearing. A gland 304 is fixedly installed at the top of the installation table 303 for limiting the upward movement of the bearing table 305. The side of the gland 304 is provided with a flange structure, which is fixedly installed with the top of the installation table 303 by using a bolt set. The gland 304 enables the bearing table 305 to stably cooperate with the installation table 303, and can bear the tilting force. The rotating power component is used to drive the bearing table 305 to rotate. The bottom of the table top 3011 is fixedly connected with a support frame 3010, and the bottom end of the support frame 3010 is fixedly installed with the top end of the bearing table 305.

[0020] In use, the bearing table 305 is driven to rotate by the rotating power component, and the support frame 3010 and the table top 3011 are driven to rotate. The clamping member 4 and the control plate 5 are both installed on the table top 3011, so that the clamping member 4 and the control plate 5 can be synchronously controlled to rotate circumferentially.

[0021] In an embodiment, the rotating power component comprises a rotating motor 307 fixedly installed at the inner bottom of the mounting seat 302, a first gear 306, and a second gear 308.

[0022] The top output end of the rotating motor 307 is fixedly installed with the second gear 308, and the first gear 306 is fixedly installed on the bearing table 305. The first gear 306 and the second gear 308 are in meshing relationship with each other. The rotating motor 307 is a servo motor, which drives the second gear 308 to rotate, and in turn drives the first gear 306 to rotate. The first gear 306 rotates synchronously with the bearing table 305.

[0023] In an embodiment, the mesa 3011 is shaped as an isosceles triangle, and a front-end square portion 3011a is fixedly arranged at the top corner of the mesa 3011, and a rear-end square portion 3011b is fixedly arranged at the tail edge of the mesa 3011, so that the front-end square portion 3011a is small and narrow, and the rear-end square portion 3011b is large and wide, the clamping member 4 is arranged at the front-end square portion 3011a, and the control plate 5 is arranged at the rear-end square portion 3011b, as shown in Figure 3 , Figure 6 The control plate 5 covers most of the side of the clamping member 4, so that the interference signals that are spread in a divergent manner can be mostly reflected by the control plate 5.

[0024] In an embodiment, the clamping member 4 is used to clamp the electronic product to be detected, and specifically, the clamping member 4 includes two groups of symmetrically arranged clamping belt members and a clamping cylinder 407 that drives the annular belt group to clamp the electronic product to be detected inwardly.

[0025] As shown in Figure 7 , each group of clamping belt members includes a first cylinder 401 and a second cylinder 402 fixedly installed at the top of the front-end square portion 3011a, the first cylinder 401 and the second cylinder 402 are arranged at intervals, and an annular belt group is installed between the first cylinder 401 and the second cylinder 402, the annular belt group includes a wide belt body 403 and a plurality of elastic narrow belt bodies 404 connected at both ends of the wide belt body 403, the wide belt body 403 and the elastic narrow belt bodies 404 constitute a ring, the clamping cylinder 407 is fixedly installed at the bottom of the front-end square portion 3011a, the clamping cylinder 407 has two ends each fixedly installed with a mounting bracket 409, the mounting bracket 409 is fixedly installed with a push plate 408, the front-end square portion 3011a is provided with a long sliding hole corresponding to the push plate 408, and the top end of the push plate 408 penetrates through the long sliding hole and extends to the inner side of the annular belt group.

[0026] In use, the electronic product to be detected is placed between the two groups of clamping belt members, and then the clamping cylinder 407 at both ends is controlled to contract inwardly, the mounting bracket 409 and the push plate 408 are driven to slide inwardly, the push plate 408 pushes the wide belt body 403 to move inwardly, the wide belt body 403 deforms and elongates the elastic narrow belt bodies 404, and the push plate 408 and the wide belt body 403 clamp the electronic product to be detected.

[0027] In an embodiment, the inner middle part of the wide band body 403 is fixedly connected with a flat plate 406 corresponding to the push plate 408, the flat plate 406 keeps the clamping part having a flat shape when the wide band body 403 is deformed, thereby avoiding clamping damage to the electronic product to be detected, a positioning frame 405 is connected between the first cylinder 401 and the second cylinder 402 of the clamping belt group, the positioning frame 405 is in a "V" shape, the top angle of the positioning frame 405 is fixedly connected with the middle part of the elastic narrow band body 404, the positioning frame 405 is used to keep the relative position of the ring-shaped belt group and the first cylinder 401 and the second cylinder 402 unchanged, thereby avoiding the flat plate 406 from being deviated.

[0028] In an embodiment, the control plate 5 comprises a sliding frame 502, a second telescopic piece 501 and a reflective plate body assembly 504.

[0029] The sliding frame 502 is slidingly installed on the inner side of the sliding opening 3011c, the sliding direction of the sliding frame 502 is along the connecting direction of the clamping piece 4 and the control plate 5, the second telescopic piece 501 is fixedly installed on the bottom of the table top 3011, the telescopic end of the second telescopic piece 501 is fixedly connected with the sliding frame 502 through the buckle plate frame 503, the reflective plate body assembly 504 is fixedly connected with the sliding frame 502, the second telescopic piece 501 is used to drive the sliding frame 502 to slide, thereby driving the reflective plate body assembly 504 to slide and adjusting the distance between the reflective plate body assembly 504 and the clamping piece 4.

[0030] The reflective plate body assembly 504 reflects the electromagnetic radiation generated by the electronic product to be detected fixed at the clamping piece 4 at different distances, thereby realizing the control of the intensity of the electromagnetic radiation reflected by the reflective plate body assembly 504, and thereby being able to adjust the actual test conditions according to the needs.

[0031] In an embodiment, the reflective plate body assembly 504 comprises a main plate body 504a, a winding drum 504b, an unwinding drum 504c, a flexible reflective sheet 504g, a servo motor 504d, a pulley 504e and a synchronous belt 504f.

[0032] The main plate body 504a serves as a framework plane, and the winding drum 504b and the unwinding drum 504c are rotatably installed on the back of the main plate body 504a in parallel and at intervals. The flexible reflective sheet 504g is arranged between the winding drum 504b and the unwinding drum 504c and passes through the front of the main plate body 504a. The two ends of the flexible reflective sheet 504g are wound on the winding drum 504b and the unwinding drum 504c, respectively. The servo motor 504d is fixedly installed on the back of the main plate body 504a and between the winding drum 504b and the unwinding drum 504c. The pulley 504e is fixedly installed at the output end of the servo motor 504d. The synchronous belt 504f is installed between the winding drum 504b, the unwinding drum 504c and the pulley 504e. The servo motor 504d directly drives the pulley 504e to rotate, thereby driving the synchronous belt 504f to rotate. The synchronous belt 504f simultaneously rotates the winding drum 504b and the unwinding drum 504c. One of the winding drum 504b and the unwinding drum 504c winds the flexible reflective sheet 504g, and the other releases the flexible reflective sheet 504g. The flexible reflective sheet 504g changes the part (also the actual acting part) corresponding to the main plate body 504a. The flexible reflective sheet 504g includes a flexible base layer and a metal layer attached to the surface of the flexible base layer. The metal layer is formed in different forms or made of different materials at different positions of the flexible reflective sheet 504g, such as full coverage, grid pattern, and strip pattern. The electromagnetic emission coefficient of the flexible reflective sheet 504g at different positions is different. For example, the reflection coefficient of the full-coverage metal copper material is close to 1, and the reflection coefficient of the grid pattern and the strip pattern metal copper material is close to 0.3-0.8.

[0033] In an embodiment, the antenna assembly 2 comprises a guide table 201, a sliding table 203, a first telescopic piece 202, a stand 204, and an antenna piece 205.

[0034] The top of the guide table 201 is provided with a slide, the length direction of the slide is along the radial direction of the rotating table 3. The sliding table 203 is slidingly installed on the top of the guide table 201. The top of the sliding table 203 is fixedly connected with the stand 204. The side surface of the stand 204 is fixedly installed with the antenna piece 205. The first telescopic piece 202 is fixedly connected with the guide table 201. The telescopic end of the first telescopic piece 202 is fixedly installed with the sliding table 203.

[0035] The sliding table 203 is pushed by the first telescopic piece 202 to slide along the slide of the guide table 201, so as to adjust the distance between the antenna piece 205 and the clamping piece 4, thereby adapting to different test requirements.

[0036] Embodiment two The embodiment provides an EMC electromagnetic compatibility test method, which uses the EMC electromagnetic compatibility test device in the embodiment one and specifically comprises the following steps. S1, fix the electronic product on the clamping part 4, control the rotating table 3 to rotate, so that the electronic product is located between the antenna assembly 2 and the control board 5.

[0037] At this time, the electronic product, the antenna assembly 2 and the control board 5 are located on the same straight line.

[0038] S2, part of the electromagnetic radiation generated by the electronic product is directly emitted to the antenna assembly 2, and the other part is reflected by the control board 5 towards the surroundings of the antenna assembly 2, the rotating table 3 is controlled to rotate within the range of ±45°, and the data of the electromagnetic radiation is recorded by the spectrum analyzer 6.

[0039] Based on the reflection of the control board 5 to the electromagnetic radiation generated by the electronic product and the emission towards the surroundings of the antenna assembly 2, the application simulates the electromagnetic interference data under the complex (two electromagnetic radiation sources) condition, so that the EMC electromagnetic compatibility data obtained by the antenna assembly test is more reliable.

[0040] Although the embodiments of the application have been shown and described, it is to be understood that for the purpose of the present application, the changes, modifications, replacements and variations of these embodiments can be made by those skilled in the art without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. An EMC electromagnetic compatibility testing device, characterized in that, include: Test chamber (1), with a door (101) on the side of the test chamber (1). A rotating platform (3) is provided with a clamping member (4) and a control plate (5) installed on its top. The center line connecting the control plate (5) and the clamping member (4) passes through the rotation center of the rotating platform (3). The control plate (5) is used to reflect the electromagnetic radiation generated by electronic products. Antenna assembly (2), which is disposed on one side of the rotating stage (3) and is communicatively connected to a spectrum analyzer (6). The rotary table (3) and antenna assembly (2) are located inside the test chamber (1).

2. The EMC electromagnetic compatibility testing device according to claim 1, characterized in that, The clamping member (4) includes: Two sets of clamping straps are symmetrically arranged at intervals. Each set of clamping straps includes a first cylindrical column (401) and a second cylindrical column (402) fixedly installed on the top of the front square part (3011a). The first cylindrical column (401) and the second cylindrical column (402) are spaced apart, and an annular belt group is installed between the first cylindrical column (401) and the second cylindrical column (402). The annular belt group includes a wide body (403) and a plurality of elastic narrow bands (404) connected to both ends of the wide body (403). The wide body (403) and the elastic narrow bands (404) form an annulus.

3. The EMC electromagnetic compatibility testing device according to claim 2, characterized in that, The clamping member (4) also includes: A clamping cylinder (407) is fixedly installed at the bottom of the front square part (3011a). Both ends of the clamping cylinder (407) are fixedly installed with mounting brackets (409). A push plate (408) is fixedly installed on the mounting brackets (409). The front square part (3011a) is provided with a long sliding hole corresponding to the push plate (408). The top end of the push plate (408) extends through the long sliding hole to the inner side of the annular belt assembly.

4. The EMC electromagnetic compatibility testing device according to claim 2, characterized in that: A flat plate (406) is fixedly connected to the inner middle of the wide band (403). The flat plate (406) corresponds to the push plate (408). A positioning frame (405) is connected between the first cylindrical column (401) and the second cylindrical column (402) of the clamping band. The positioning frame (405) is "V" shaped. The top corner of the positioning frame (405) is fixedly connected to the middle of the elastic narrow band (404).

5. The EMC electromagnetic compatibility testing device according to claim 1, characterized in that, The control panel (5) includes: The sliding frame (502) has a sliding opening (3011c) at the rear square portion (3011b), and the sliding frame (502) is slidably installed on the inner side of the sliding opening (3011c); The second telescopic component (501) is fixedly installed on the bottom of the tabletop (3011), and the telescopic end of the second telescopic component (501) is fixedly connected to the sliding frame (502) through the buckle bracket (503). A reflector body assembly (504) is fixedly connected to a sliding frame (502).

6. The EMC electromagnetic compatibility testing device according to claim 5, characterized in that, The reflector assembly (504) includes: A main body (504a) has a take-up drum (504b) and an unwind drum (504c) that are rotatably mounted on its back side. A flexible reflective sheet (504g) is provided between the take-up drum (504b) and the unwind drum (504c) and across the front side of the main body (504a).

7. The EMC electromagnetic compatibility testing device according to claim 6, characterized in that, The reflector assembly (504) includes: The flexible reflective sheet (504g) includes a flexible base layer and a metal layer attached to the surface of the flexible base layer.

8. The EMC electromagnetic compatibility testing device according to claim 1, characterized in that, The antenna assembly (2) includes: A guide platform (201) is provided with a slide rail on its top, the length of which is along the radial direction of the rotary table (3); A sliding platform (203) is slidably mounted on the top of the guide platform (201). A support frame (204) is fixedly connected to the top of the sliding platform (203), and an antenna component (205) is fixedly mounted on the side of the support frame (204). The first telescopic component (202) is fixedly connected to the guide platform (201), and the telescopic end of the first telescopic component (202) is fixedly installed with the sliding platform (203).

9. An EMC electromagnetic compatibility testing method, characterized in that, The use of the EMC electromagnetic compatibility testing device according to claim 1 specifically includes the following steps: S1. Fix the electronic product on the clamp (4), control the rotary table (3) to rotate, so that the electronic product is located between the antenna assembly (2) and the control plate (5); S2. Part of the electromagnetic radiation generated by the electronic product is directly emitted to the antenna assembly (2), and the other part is reflected by the control plate (5) towards the antenna assembly (2). The rotary table (3) is controlled to rotate within a range of ±45°, and the electromagnetic radiation data is recorded by the spectrum analyzer (6).

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