Shielding effectiveness test system and method

Abstract

The present application provides a shielding effectiveness testing system and method. First, an omnidirectional antenna is used to simultaneously transmit test electromagnetic wave signals in any direction. The omnidirectional antenna is provided with a sample to be tested, so the transmitted test electromagnetic wave signal is at different angles to the sample to be tested. Then, the receiving antenna is set at different positions on the side of the support frame facing the omnidirectional antenna. At this time, the receiving antenna receives the test electromagnetic wave signal from the omnidirectional antenna, that is, it can simultaneously test the shielding effectiveness of the sample to be tested according to the electromagnetic wave signals at different incident angles. The present application only needs one test to obtain the shielding effectiveness of the sample to be tested at different incident angles. Since it is only tested once, the electromagnetic wave signals emitted during the test are highly consistent, that is, the consistency is good, avoiding the poor consistency of the emitted electromagnetic wave signals due to multiple tests, which in turn leads to large errors in the test results. Therefore, the present application can reduce test errors, improve test accuracy, and greatly improve test efficiency.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic compatibility technology, and in particular to a shielding effectiveness testing system and method. Background Art

[0002] With the development of electronic technology, the electromagnetic environment in space is becoming increasingly complex. This complex electromagnetic environment can interfere with or even damage electronic equipment within it. Electromagnetic shielding can eliminate interference by cutting off the propagation path of electromagnetic waves.

[0003] The electromagnetic shielding effectiveness test method can effectively test the shielding effectiveness of electromagnetic shielding materials. Existing technologies such as the active light-transmitting shielding film shielding effectiveness test method, device and system (publication number: CN109406899A, publication date: 2019.03.01) generate a preset intensity electromagnetic wave signal through an electromagnetic wave signal generating device, and irradiate the electromagnetic wave signal to the window of a metal box with an optical glass window. The light-transmitting shielding film to be tested is set on the optical glass. The electromagnetic shielding effectiveness calculation device collects the electromagnetic wave signal intensity in the metal box after being shielded by the light-transmitting shielding film to be tested, and calculates the ratio of the electromagnetic wave signal intensity to the electromagnetic wave signal intensity in the metal box without the light-transmitting shielding film to be tested as the shielding effectiveness value of the light-transmitting shielding film to be tested. This achieves accurate testing of the shielding effectiveness of the light-transmitting shielding film.

[0004] When testing the shielding effectiveness of a sample under test based on electromagnetic wave signals at different incident angles, the existing testing method is as follows: after the first test is completed, the transmitting antenna needs to be turned off, the position of the transmitting antenna needs to be changed, and then the transmitting antenna needs to be turned on again for a second test. The above steps are repeated multiple times until the shielding effectiveness of the sample under test at all incident angles is measured. This method has the following problems: the electromagnetic wave signal emitted during the second test cannot be completely consistent with the electromagnetic wave signal emitted during the first test. Similarly, the electromagnetic wave signal emitted during each test cannot be consistent with the electromagnetic wave signal emitted during the previous test. The more tests are conducted, the more errors accumulate, resulting in large errors in the test results after multiple tests. Summary of the Invention

[0005] The purpose of the present invention is to provide a shielding effectiveness testing system and method, which can solve the problem in the existing shielding effectiveness testing technology of shielding materials that when testing the shielding effectiveness of the sample to be tested according to electromagnetic wave signals at different incident angles, the electromagnetic wave signal emitted in each test cannot be consistent with the electromagnetic wave signal emitted in the previous test, that is, the consistency is poor, resulting in large errors in the test results after multiple tests.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] In a first aspect, a shielding effectiveness test system is provided, comprising a shielding room, the system further comprising:

[0008] A signal transmitting device is disposed in the shielding chamber, the signal transmitting device including an omnidirectional antenna for simultaneously transmitting test electromagnetic wave signals in any direction. When the omnidirectional antenna is provided with a sample to be tested, the multiple test electromagnetic wave signals emitted by the omnidirectional antenna in the sample space surrounded by the sample to be tested form different angles with the surface of the sample to be tested;

[0009] A signal receiving device is arranged in the shielding room, and the signal receiving device includes a support frame and several receiving antennas. The omnidirectional antenna is arranged at the center of the support frame, and the several receiving antennas are arranged at different positions on the side of the support frame facing the omnidirectional antenna, for receiving test electromagnetic wave signals at different angles to the surface of the sample to be tested.

[0010] In a possible implementation of the first aspect, the entire inner surface of the shielding chamber is provided with absorbing material.

[0011] In a possible implementation of the first aspect, the support frame is annular.

[0012] In a possible implementation of the first aspect, the support frame is vertically installed in the shielding room.

[0013] In a possible implementation of the first aspect, the support frame is horizontally installed in the shielding room.

[0014] In a possible implementation of the first aspect, the support frame is spherical, and the omnidirectional antenna is located at the center of the spherical support frame.

[0015] In a possible implementation of the first aspect, the system further includes: a support member including a plurality of mounting surfaces, wherein the support member is mounted outside the omnidirectional antenna, and a plurality of samples to be tested are correspondingly mounted on the plurality of mounting surfaces, so that the samples to be tested form a sample space, and the test electromagnetic wave signal emitted by the omnidirectional antenna in the sample space is at different angles to the surface of the sample to be tested.

[0016] A possible implementation of the first aspect is that the system also includes: a shielding component, the shielding component including a shielding layer and an adhesive layer, the adhesive layer being used to be adhered to the connection between the mounting surface and the sample to be tested to close the gap between the mounting surface and the sample to be tested, and the shielding layer covering the surface of the adhesive layer.

[0017] In a possible implementation of the first aspect, the system further includes: a supporting base, wherein the supporting base is made of a wave-absorbing material and is used to support the sample to be tested.

[0018] In a second aspect, a shielding effectiveness test method is provided, which is applied to the above-mentioned shielding effectiveness test system, and the method comprises the following steps:

[0019] First signal transmitting step: when the sample to be tested is disposed on the outer cover of the signal transmitting device, the signal transmitting device receives a first signal transmitting instruction and transmits a first test electromagnetic wave signal;

[0020] A first signal receiving step: a signal receiving device collects the first test electromagnetic wave signal transmitted through the sample to be tested and reads a first value, and sends the first value to a computing device;

[0021] Second signal transmission step: when the sample to be tested is removed from the outer casing of the signal transmitting device, the signal transmitting device receives a second signal transmission instruction and transmits a second test electromagnetic wave signal;

[0022] A second signal receiving step: a signal receiving device collects the second test electromagnetic wave signal that has not passed through the sample to be tested and reads a second value, and sends the second value to the calculation device;

[0023] Calculation step: The calculation device calculates the shielding effectiveness of the sample to be tested based on the received first value and the second value.

[0024] The above-mentioned shielding effectiveness test system and method, first, utilizes an omnidirectional antenna to simultaneously transmit test electromagnetic wave signals in any direction. The outer cover of the omnidirectional antenna is provided with a sample to be tested, so the transmitted test electromagnetic wave signal is at different angles to the sample to be tested, and then the receiving antenna is set at different positions on the side of the support frame facing the omnidirectional antenna. At this time, the receiving antenna receives the test electromagnetic wave signal from the omnidirectional antenna, that is, it can simultaneously test the shielding effectiveness of the sample to be tested according to the electromagnetic wave signals at different incident angles. Compared with the prior art, which requires multiple tests to obtain the shielding effectiveness of the sample to be tested at different incident angles, the present application only requires one test to obtain the shielding effectiveness of the sample to be tested at different incident angles. Since it is only tested once, the electromagnetic wave signals emitted during the test are highly consistent, that is, the consistency is good, avoiding the poor consistency of the emitted electromagnetic wave signals due to multiple tests, which in turn leads to large errors in the test results. Therefore, the present application can reduce test errors and improve test accuracy.

[0025] Secondly, this application only requires a single test to determine the shielding effectiveness of the sample under test at different incident angles, unlike the existing technology that requires multiple tests, resulting in multiple adjustments to the equipment position and multiple control devices to test the shielding effectiveness. Therefore, when testing the shielding effectiveness of the sample under test at different incident angles, this application can greatly improve testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0027] in:

[0028] Figure 1 An angle diagram in one embodiment;

[0029] Figure 2 A schematic diagram of the structure of a shielding effectiveness test system in one embodiment;

[0030] Figure 3 A schematic diagram of the structure of a shielding effectiveness test system in one embodiment;

[0031] Figure 4 A schematic diagram of the structure of a shielding effectiveness test system in one embodiment;

[0032] Figure 5 A schematic diagram of the structure of a shielding effectiveness test system in one embodiment;

[0033] Figure 6 A schematic diagram of a partial structure of a shielding effectiveness test system in one embodiment;

[0034] Figure 7 A schematic diagram of a partial structure of a shielding effectiveness test system in one embodiment;

[0035] Figure 8 FIG. 1 is a flow chart of a shielding effectiveness testing method according to an embodiment.

[0036] Among them, 1. Shielding room; 2. Signal transmitting device; 21. Omnidirectional antenna; 3. Signal receiving device; 31. Support frame; 32. Receiving antenna; 4. Sample to be tested; 5. Absorbing material; 6. Support member; 7. Shielding assembly; 8. Support base. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] It should be noted that the terms "include", "comprising" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, terminal, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices. In the claims, specification and drawings of this application, relational terms such as "first" and "second" are merely used to distinguish one entity / operation / object from another entity / operation / object, and do not necessarily require or imply any such real-time relationship or order between these entities / operations / objects.

[0040] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] It is worth noting that the angle mentioned in this application is the angle between the direction of the test electromagnetic wave signal emitted by the omnidirectional antenna 21 and each position on the surface of the sample 4 to be tested. Figure 1 As shown, angle a and angle b are the angles formed by the directions of the two test electromagnetic wave signals emitted by the omnidirectional antenna 21 and the surface 4 of the sample to be tested, which can be understood as the angles formed by the connecting line between the omnidirectional antenna 21 and the receiving antenna 32 (i.e., the two dotted lines in the figure) and the surface 4 of the sample to be tested.

[0042] In the prior art, testing the shielding effectiveness of a sample generally involves placing a signal receiving device inside a shielded room, a signal transmitting device outside the shielded room, and then opening a window in the shielded room. The sample to be tested is then placed in the window to test the shielding effectiveness. When testing the shielding effectiveness of the sample under test based on electromagnetic wave signals at different incident angles, the signal transmitting device outside the shielded room needs to be moved to change the angle between the electromagnetic wave signal emitted by the signal transmitting device and the sample under test, and the shielding effectiveness of the sample under test at that angle is tested. To test the shielding effectiveness of the sample under test at multiple angles, the process of "turning off the signal transmitting device, moving the signal transmitting device, and turning on the signal transmitting device" needs to be repeated multiple times. This results in poor consistency in the electromagnetic wave signals emitted during each test, leading to large errors in the test results and low test efficiency. In order to solve these problems, the present application adopts an omnidirectional antenna to transmit electromagnetic wave signals, and the sample is placed outside the omnidirectional antenna. At this time, the omnidirectional antenna simultaneously transmits multiple test electromagnetic wave signals in the sample space surrounded by the sample to be tested at different angles to the surface of the sample to be tested, and receiving antennas at different positions are provided on the support frame arranged outside the omnidirectional antenna, which can receive test electromagnetic wave signals at different angles to the surface of the sample to be tested. Therefore, the present application can obtain the shielding effectiveness of the sample to be tested at different incident angles with only one test. Since it is only tested once, the electromagnetic wave signals emitted during the test are highly consistent, that is, the consistency is good, avoiding the poor consistency of the electromagnetic wave signals emitted due to multiple tests, which leads to large errors in the test results. Therefore, the present application can reduce test errors and improve test accuracy. Secondly, the present application only needs one test to obtain the shielding effectiveness of the sample to be tested at different incident angles, which is different from the prior art that requires multiple tests, resulting in the need to adjust the equipment position multiple times and control the equipment multiple times to test the shielding effectiveness. Therefore, when testing the shielding effectiveness of the sample to be tested at different incident angles, the present application can greatly improve test efficiency.

[0043] like Figure 2 As shown, a shielding effectiveness test system is proposed, the system comprising:

[0044] A signal transmitting device 2 is provided in the shielding chamber 1. The signal transmitting device 2 includes an omnidirectional antenna 21 for simultaneously transmitting test electromagnetic wave signals in any direction. When the omnidirectional antenna 21 is provided with a test sample 4, the omnidirectional antenna 21 transmits multiple test electromagnetic wave signals in the sample space surrounded by the test sample 4 at different angles to the surface of the test sample 4.

[0045] The signal receiving device 3 is arranged in the shielding room 1. The signal receiving device 3 includes a support frame 31 and several receiving antennas 32. The omnidirectional antenna 21 is arranged at the center of the support frame 31, and the several receiving antennas 32 are arranged at different positions on the side of the support frame 31 facing the omnidirectional antenna 21, for receiving test electromagnetic wave signals at different angles to the surface of the sample 4 to be tested.

[0046] in, Figure 2 It is a structural diagram of the shielding effectiveness test system from a side view angle. The shielding room 1 is a closed all-metal box structure, and can also be a closed space composed of other shielding materials. The signal transmitting device 2 includes an omnidirectional antenna 21 and a signal transmitter, as well as a support column for fixing the omnidirectional antenna 21. The omnidirectional antenna 21 is electrically connected to the signal transmitter. It is worth noting that the omnidirectional antenna 21 will transmit signals in all directions, and can receive signals from the front, back, left and right. The outer cover of the omnidirectional antenna 21 is provided with a sample to be tested 4, and the sample to be tested 4 can be integrally formed, such as an integrally formed cube, cylinder, etc. The sample to be tested 4 can also be installed on a support frame 31. The support frame 31 has multiple surfaces for installing the sample to be tested 4, so that after each surface is installed with a sample to be tested 4 of a corresponding shape, the samples to be tested 4 on multiple surfaces can form a closed sample space. It is worth noting that there is no contact between the omnidirectional antenna 21 and the sample to be tested 4. The omnidirectional antenna 21 is fixed in the air by the support column below. A cable channel is opened in the support column. The sample to be tested 4 is mounted on the outside of the omnidirectional antenna 21 by the support base 8. The support base 8 is mounted on the outside of the support column. The lower surface of the sample to be tested 4 needs to have an opening that matches the cross-sectional shape of the support column so that it can be mounted on the outside of the omnidirectional antenna 21 without contact. The opening of the sample to be tested 4 in the gap of the support column needs to be sealed with a material with strong shielding effectiveness, such as conductive tape. In addition, when the omnidirectional antenna 21 simultaneously emits test electromagnetic wave signals in any direction within the sample space surrounded by the sample to be tested 4, there will be multiple test electromagnetic wave signals at different angles to the surface of the sample to be tested 4. Therefore, the shielding effectiveness of the sample to be tested 4 can be tested by electromagnetic wave signals at different angles.

[0047] In addition, the signal receiving device 3 includes a plurality of receiving antennas 32 (only one receiving antenna 32 is marked in the figure) and a spectrum analyzer, as well as a support frame 31 for fixing the plurality of receiving antennas 32. The receiving antenna 32 is electrically connected to the spectrum analyzer. The omnidirectional antenna 21 is arranged at the center of the support frame 31. For example, if the support frame 31 is a circular ring, the omnidirectional antenna 21 is arranged at the center of the circle. The receiving antennas 32 are arranged at different positions on the side of the support frame 31 facing the omnidirectional antenna 21. They can be evenly arranged or can be arranged as needed. When the test electromagnetic wave signal at different angles to the sample to be tested 4 passes through the sample to be tested 4, it can be received by the multiple receiving antennas 32 on the support frame 31 and read by the spectrum analyzer. Then remove the sample to be tested 4, and read the intensity value of the test electromagnetic wave signal emitted by the omnidirectional antenna 21 when there is no obstruction from the sample to be tested 4. The shielding effectiveness of the sample to be tested 4 at different angles is calculated based on the two readings.

[0048] The present application tests the shielding effectiveness of the sample 4 under test at different angles using the following operating steps: turning on the signal transmitter 2, reading the value, turning off the signal transmitter 2, removing the sample 4 under test, turning on the signal transmitter 2, reading the value, and calculating. Compared to the cumbersome steps of the prior art, the present application only requires a single test to determine the shielding effectiveness of the sample 4 under different incident angles. Since the test is only performed once, the electromagnetic wave signals emitted during the test are highly consistent, i.e., have good consistency. This avoids the poor consistency of the emitted electromagnetic wave signals due to multiple tests, which in turn leads to large errors in the test results. Therefore, the present application can reduce test errors and improve test accuracy.

[0049] Secondly, the present application only requires a single test to determine the shielding effectiveness of the test sample 4 at different incident angles, unlike the prior art which requires multiple tests, resulting in multiple adjustments to the equipment position and multiple device controls to test the shielding effectiveness. Therefore, the present application can greatly improve the testing efficiency when testing the shielding effectiveness of the test sample 4 at different incident angles.

[0050] like Figure 3 As shown, in a preferred embodiment, the entire inner surface of the shielding room 1 is provided with absorbing material 5 .

[0051] in, Figure 3It is a structural diagram of the shielding effectiveness test system under a side view angle. The absorbing material 5 (only one place is marked in the figure) is preferably an absorbing sponge, which is fixed to the inner surface of the shielding room 1 by glue or other fixing methods. In some scenarios, people hope that the shielding effectiveness of the material is as weak as possible, such as car glass. The weaker the shielding effectiveness, the better the mobile phone signal received in the car. When testing the shielding effectiveness of these materials, due to their weak shielding effectiveness, a large amount of electromagnetic wave signals easily pass through the sample to be tested 4 and reflect everywhere in the shielding room 1, causing a multipath effect. Therefore, the present application is provided with absorbing materials 5 on all the inner surfaces of the shielding room 1. The purpose of providing the absorbing material 5 is to weaken or even eliminate the multipath effect during the propagation of electromagnetic waves, and to avoid the reflection of electromagnetic waves on the inner surfaces of the shielding room 1 such as the floor, walls, ceiling, etc., resulting in inconsistent energy density and random polarization in the shielding room 1, which in turn leads to inaccurate electromagnetic wave signals received by the signal receiving device 3. Therefore, by arranging the entire inner surface of the shielding room 1 with absorbing material 5, the absorbing material 5 can absorb the electromagnetic wave signals reflected by the ground, ceiling and walls in the shielding room 1, reduce the electromagnetic wave signal fluctuations caused by the reflection on the inner surface of the shielding room 1, keep the electromagnetic signal energy density in the shielding room 1 stable, and reduce the error of the test results.

[0052] In a preferred embodiment, the support frame 31 is annular.

[0053] It is worth noting that when the support frame 31 is in a circular shape, the omnidirectional antenna 21 is arranged at the center of the support frame 31, and a receiving antenna 32 is arranged on the side of the support frame 31 facing the omnidirectional antenna 21. At this time, the distance between each receiving antenna 32 and the omnidirectional antenna 21 is the same. Therefore, the electromagnetic wave signals received by each receiving antenna 32 will only have different intensities of the electromagnetic wave signals due to different angles of transmission through the sample 4 to be tested, and will not have different intensities of the electromagnetic wave signals due to different distances from the transmitting antenna to the receiving antenna 32. This eliminates the interference of the distance factor, making the test results more accurate.

[0054] like Figure 2 As shown, in a specific embodiment, the support frame 31 is vertically installed in the shielding room 1.

[0055] It is worth noting that when the support frame 31 is vertically installed in the shielding room 1, the bottom of the support frame 31 can be fixed to other supporting structures, and can be fixed by welding, bolting, etc. The advantages of vertically installing the support frame 31 are simple installation, complete supporting equipment, and low installation cost.

[0056] like Figure 4 As shown, in another specific embodiment, the support frame 31 is horizontally installed in the shielding room 1.

[0057] It is worth noting that Figure 4It is a structural diagram of the shielding effectiveness test system under a side view angle. When the support frame 31 is horizontally installed in the shielding room 1, the support frame 31 can be fixed by other supporting structures, such as supporting the support frame 31 by two pillars, and can be fixed by welding, bolt connection and other fixing methods. When the support frame 31 is horizontally installed in the shielding room 1, the omnidirectional antenna 21 and the support frame 31 are on the same horizontal plane and are located at the center of the support frame 31. The advantage of horizontally installing the support frame 31 is that the electromagnetic wave signal emitted by the omnidirectional antenna in the horizontal direction is uniform, and is subject to certain restrictions in the vertical direction, resulting in uneven electromagnetic wave signals at certain angles. For example, the electromagnetic wave signal at the bottom of the omnidirectional antenna 21 is inconsistent with the electromagnetic wave signals at other positions. That is, there is an error in the electromagnetic wave signal emitted by a small area of ​​the omnidirectional antenna 21 in the vertical direction. Therefore, the support frame 31 is set horizontally, and the receiving antenna 32 on the support frame 31 is in the same horizontal plane as the omnidirectional antenna 21. Therefore, the receiving antenna 32 receives the electromagnetic wave signal emitted horizontally by the omnidirectional antenna 21, there is no error, and there is no test blind spot.

[0058] like Figure 5 As shown, in another preferred embodiment, the support frame 31 is spherical, and the omnidirectional antenna 21 is located at the center of the spherical support frame 31.

[0059] It is worth noting that Figure 5 It is a structural diagram of the shielding effectiveness test system under a side view angle. When the support frame 31 is spherical, the support frame 31 can be fixed by other supporting structures, such as using a base to fix the support frame 31, and can be fixed by welding, bolting, etc. When the support frame 31 is spherical, the omnidirectional antenna 21 is located at the center of the spherical support frame 31, and the receiving antenna 32 is evenly arranged on the inner surface of the spherical support frame 31. The advantage of the spherical support frame 31 is that it can receive electromagnetic wave signals at any angle. Since the omnidirectional antenna 21 can transmit electromagnetic wave signals at any angle, the shielding effectiveness of the sample 4 to be tested at any angle can be tested in combination, which can further improve the test efficiency.

[0060] like Figure 6 As shown, in a specific embodiment, the system further includes: a support member 6, including multiple mounting surfaces, the support member 6 is arranged outside the omnidirectional antenna 21, and multiple samples to be tested 4 are installed corresponding to the multiple mounting surfaces, so that the samples to be tested 4 form a sample space, and the test electromagnetic wave signal emitted by the omnidirectional antenna 21 in the sample space is at different angles to the surface of the sample to be tested 4.

[0061] It is worth noting that the material of the support member 6 is a material with strong shielding performance, such as metal. The processing difficulty of the one-piece molding of different materials to be tested is different, such as glass and other materials. Therefore, the present application is provided with a support member 6, such as Figure 6 As shown, the shape of the support member 6 is preferably a cube, the support member 6 is hollow, and each side is hollowed out to form a mounting surface ( Figure 6 Only one mounting surface is shown, and the mounting surface is preferably rectangular. Therefore, the test sample 4 only needs to be machined into a shape that matches the mounting surface, for example, a rectangular shape. This significantly reduces the difficulty of machining the test sample 4 and improves its applicability. Furthermore, different test samples can be mounted on different mounting surfaces, enabling simultaneous testing of multiple samples and improving testing efficiency.

[0062] In addition, after the sample to be tested 4 is installed on multiple mounting surfaces of the support member 6, a closed sample space is formed inside the support member 6, and the omnidirectional antenna 21 is set in the sample space. The test electromagnetic wave signal emitted by the omnidirectional antenna 21 forms different angles with the surface of the sample to be tested 4 on different mounting surfaces.

[0063] In a preferred embodiment, the system also includes: a shielding component 7, the shielding component 7 includes a shielding layer and an adhesive layer, the adhesive layer is used to be pasted at the connection between the mounting surface and the sample to be tested 4 to close the gap between the mounting surface and the sample to be tested 4, and the shielding layer covers the surface of the adhesive layer.

[0064] It is worth noting that after the test sample 4 is mounted on the mounting surface, a gap still exists between the test sample 4 and the support member 6. Electromagnetic wave signals can enter the signal receiving space through these gaps, resulting in the electromagnetic wave signals received by the signal receiving device 3 not being entirely electromagnetic wave signals that have passed through the test sample 4, which can affect the accuracy of the test results. Therefore, this embodiment also provides a shielding assembly 7, including a shielding layer and an adhesive layer. The shielding layer is made of a shielding material such as metal, and the adhesive layer is made of a sticky material. The shielding assembly 7 of this embodiment is preferably conductive tape. Figure 7 The figure shows a schematic diagram of a shielding assembly 7 affixed to the gap between a mounting surface and a test sample 4. The adhesive layer of the shielding assembly 7 is affixed to the connection between the test sample 4 and the support member 6, sealing the gap at the connection. The shielding layer covers the surface of the adhesive layer, shielding electromagnetic wave signals and preventing them from penetrating the adhesive layer into the signal receiving space and interfering with the test.

[0065] In a more preferred embodiment, the system also includes: a shielding component 7, the shielding component 7 includes a shielding layer, an adhesive layer and a conductive wire mesh, the conductive wire mesh is used to fill the gap between the sample frame and the sample, the adhesive layer is used to fix the conductive wire mesh, and the shielding layer covers the surface of the adhesive layer.

[0066] Among them, after the sample to be tested 4 is installed on the mounting surface, there is still a gap between the sample to be tested 4 and the supporting member 6. Electromagnetic wave signals can enter the signal receiving space through these gaps, resulting in the electromagnetic wave signals received by the signal receiving device 3 not being all electromagnetic wave signals that have passed through the sample to be tested 4, which will affect the accuracy of the test results. Therefore, this embodiment is also provided with a shielding component 7, including a shielding layer, an adhesive layer and a conductive wire mesh. The conductive wire mesh is a mesh made of metal conductive wire and has good shielding effectiveness. The conductive wire mesh is filled in the gap between the sample frame and the sample to block the gap as the first layer of protection. Since the conductive wire mesh is fixed by friction between the gap and is easy to fall off, a layer of adhesive layer is also pasted on the outside of the conductive wire mesh to fix the conductive wire mesh. The shielding layer covers the surface of the adhesive layer as the second layer of protection. The double protection of the conductive wire mesh and the shielding layer prevents the electromagnetic wave signal from passing through the adhesive layer into the signal receiving space and interfering with the test.

[0067] like Figure 2 As shown, in a specific embodiment, the system further includes: a supporting base 8, the supporting base 8 is made of a wave-absorbing material and is used to support the sample 4 to be tested.

[0068] It is worth noting that since the sample to be tested 4 and the omnidirectional antenna 21 cannot be in direct contact, otherwise the test accuracy will be affected, a structure is required to fix the sample to be tested 4. In this embodiment, a support base 8 is used to support the sample to be tested 4. The lower end of the support base 8 is fixed to the floor of the shielding room 1, and the upper end of the support base 8 supports the sample to be tested 4. The height adaptability of the support base 8 is set to keep the sample to be tested 4 and the omnidirectional antenna 21 at a suitable distance. In addition, the support base 8 is made of an absorbing material and cannot be made of metal or other materials. If the base is made of metal, the electromagnetic wave signal of the omnidirectional antenna 21 passing through the bottom of the sample to be tested 4 will be reflected back by the metal base, affecting the accuracy of the test results.

[0069] like Figure 8 As shown, a shielding effectiveness test method is proposed, which is applied to a shielding effectiveness test system. The method includes the following steps:

[0070] First signal transmission step 101: When the signal transmitting device 2 is provided with the sample 4 to be tested, the signal transmitting device 2 receives a first signal transmission instruction and transmits a first test electromagnetic wave signal;

[0071] First signal receiving step 102: the signal receiving device 3 collects the first test electromagnetic wave signal transmitted through the test sample 4 and reads a first value, and sends the first value to the calculation device;

[0072] Second signal transmission step 103: when the sample 4 to be tested is removed from the outer casing of the signal transmitting device 2, the signal transmitting device 2 receives a second signal transmission instruction and transmits a second test electromagnetic wave signal;

[0073] Second signal receiving step 104: the signal receiving device 3 collects the second test electromagnetic wave signal that has not passed through the test sample 4 and reads a second value, and sends the second value to the calculation device;

[0074] Calculation step 105: The calculation device calculates the shielding effectiveness of the sample to be tested 4 according to the received first value and the second value.

[0075] It's worth noting that both the signal transmitter 2 and the signal receiver 3 are electrically connected to an external computing device, which performs both computation and control functions. After the computing device transmits a signal transmission instruction to the signal receiver 3, the omnidirectional antenna 21 in the signal receiver 3 simultaneously transmits a first test electromagnetic wave signal in all directions. The signal receiver 3 automatically collects the first test electromagnetic wave signal from multiple angles that penetrate the test sample 4, reads the values, and sends the first values ​​to the computing device. After the test sample 4 is removed, the computing device again transmits a signal transmission instruction to the signal transmitter 2, causing the omnidirectional antenna 21 in the signal transmitter 2 to simultaneously transmit a second test electromagnetic wave signal in all directions. The signal receiver 3 automatically collects the second test electromagnetic wave signal from multiple angles that do not penetrate the test sample 4, reads the values, and sends the second values ​​to the computing device. Based on the received first and second values, the computing device performs calculations according to a preset method, outputting the shielding effectiveness of the test sample 4 at various angles between the test electromagnetic wave signal and the test sample 4. This completes the test.

[0076] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A shielding effectiveness test system, comprising a shielding room, characterized in that: The system further comprises: A signal transmitting device is disposed in the shielding chamber, the signal transmitting device including an omnidirectional antenna for simultaneously transmitting test electromagnetic wave signals in any direction. When the omnidirectional antenna is provided with a sample to be tested, the multiple test electromagnetic wave signals emitted by the omnidirectional antenna in the sample space surrounded by the sample to be tested form different angles with the surface of the sample to be tested; A signal receiving device is provided in the shielding chamber, the signal receiving device includes a support frame and a plurality of receiving antennas, the omnidirectional antenna is provided at the center of the support frame, and the plurality of receiving antennas are provided at different positions on a side of the support frame facing the omnidirectional antenna, for receiving test electromagnetic wave signals at different angles to the surface of the sample to be tested; The entire surface of the shielding room is provided with wave absorbing materials; The system further comprises: A support member includes a plurality of mounting surfaces, the support member being sleeved outside the omnidirectional antenna, and a plurality of samples to be tested being mounted corresponding to the plurality of mounting surfaces, so that the samples to be tested form a sample space, and the test electromagnetic wave signals emitted by the omnidirectional antenna in the sample space are at different angles to the surface of the samples to be tested; The system further comprises: A shielding assembly, comprising a shielding layer and an adhesive layer, wherein the adhesive layer is attached to the connection between the mounting surface and the sample to be tested to close the gap between the mounting surface and the sample to be tested, and the shielding layer covers the surface of the adhesive layer; The system further comprises: The support base is made of wave-absorbing material and is used to support the sample to be tested.

2. The shielding effectiveness testing system according to claim 1, wherein: The support frame is in a circular ring shape.

3. The shielding effectiveness testing system according to claim 2, wherein: The support frame is vertically installed in the shielding room.

4. The shielding effectiveness testing system according to claim 2, wherein: The support frame is horizontally installed in the shielding room.

5. The shielding effectiveness testing system according to claim 1, wherein: The support frame is spherical, and the omnidirectional antenna is located at the center of the spherical support frame.

6. A shielding effectiveness test method, applied to the shielding effectiveness test system according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: First signal transmitting step: when the sample to be tested is disposed on the outer cover of the signal transmitting device, the signal transmitting device receives a first signal transmitting instruction and transmits a first test electromagnetic wave signal; A first signal receiving step: a signal receiving device collects the first test electromagnetic wave signal transmitted through the sample to be tested and reads a first value, and sends the first value to a computing device; Second signal transmission step: when the sample to be tested is removed from the outer casing of the signal transmitting device, the signal transmitting device receives a second signal transmission instruction and transmits a second test electromagnetic wave signal; A second signal receiving step: a signal receiving device collects the second test electromagnetic wave signal that has not passed through the sample to be tested and reads a second value, and sends the second value to the calculation device; Calculation step: The calculation device calculates the shielding effectiveness of the sample to be tested based on the received first value and the second value.

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