Wave absorbing device, application thereof and loading capacity determination method

Abstract

The embodiment of the invention provides a wave absorbing device, application thereof and a loading capacity determination method, and belongs to the technical field of communication. The wave-absorbing device comprises a container and a wave-absorbing material accommodated in the container, the wave-absorbing material comprises water and an ionic electrolyte, and the ionic electrolyte is dissolved in the water; the container is a non-metal container. The wave-absorbing material in the form of the aqueous solution of the ionic electrolyte can convert electromagnetic energy into kinetic energy, and then the kinetic energy is converted into heat energy through friction and dissipated to the outside, so that the field intensity in the closed electromagnetic total reflection environment is reduced, the power density of the surface of the PIM source in the closed electromagnetic total reflection environment is reduced, and the power density of the PIM source is improved. Therefore, the self-excited PIM power of the closed electromagnetic total reflection environment is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an absorbing device and its application, and a method for determining a loading amount. Background Art

[0002] The radio reverberation chamber is an electrically oversized metal shielded cavity. It uses a variety of stirring methods to change the electromagnetic field distribution in the cavity, so that the electromagnetic field distribution achieves statistical spatial uniformity and isotropy. This statistical characteristic of the radio reverberation chamber makes it suitable for testing performance parameters that are insensitive to directionality, such as total radiated power (TRP), antenna efficiency, total radiation sensitivity, etc., and is therefore widely used in Over-the-Air (OTA) testing.

[0003] At present, the radio reverberation chamber test system can support the test of the TRP index of low-frequency modules. However, due to the high field strength characteristics of the radio reverberation chamber, it will stimulate its own serious passive intermodulation (Passive Intermodulation, PIM) under high power conditions, thereby raising the background noise of the radio reverberation chamber test system, resulting in out-of-band spurious and adjacent channel power leakage ratio (Adjacent Channel Leakage Power Ratio, ACLR) and other indicators cannot meet the test requirements.

[0004] Therefore, it is necessary to reduce the field strength inside the radio reverberation chamber to achieve the purpose of reducing the PIM power therein.

[0005] Public Content

[0006] The embodiments of the present disclosure provide an absorbing device and its application, and a method for determining the loading amount, which can solve the technical problems existing in the related technologies. Specifically, the technical solution is as follows:

[0007] On the one hand, an embodiment of the present disclosure provides an absorbing device, which includes: a container and an absorbing material contained inside the container; the absorbing material includes water and an ionic electrolyte, and the ionic electrolyte is dissolved in the water; the container is a non-metallic container.

[0008] The absorbing device provided by the embodiment of the present disclosure has an absorbing material including water and an ionic electrolyte dissolved in water, so that the absorbing material is an aqueous solution of an ionic electrolyte. When the absorbing device is applied to a closed electromagnetic total reflection environment, the absorbing material in the form of an aqueous solution of an ionic electrolyte can convert electromagnetic energy into kinetic energy, and then convert the kinetic energy into heat energy through friction, so as to reduce the field intensity in the closed electromagnetic total reflection environment, so that the power density on the surface of the PIM source in the closed electromagnetic total reflection environment is reduced, thereby reducing the PIM power excited by the closed electromagnetic total reflection environment itself. In addition, the absorbing device uses a container to contain the absorbing material in the form of a solution, and by making the container a non-metallic container, electromagnetic waves are allowed to pass through the container as unimpeded as possible to be incident on the absorbing material, so that the absorbing material can give full play to its absorbing function.

[0009] In addition to the above-mentioned effect of reducing the field intensity, the aqueous solution of ionic electrolyte as an absorbing material has at least the following advantages: (1) The aqueous solution of ionic electrolyte itself is a nonlinear material that cannot produce passive intermodulation, and will not introduce new PIM sources into the closed electromagnetic total reflection environment in which it is located. (2) The temperature rise of the aqueous solution of ionic electrolyte is small after absorbing electromagnetic waves, so that the risk of fire hazards can be significantly reduced (that is, the EHS risk is reduced). For example, the related art uses a pyramidal absorbing material, which is flammable and has a high temperature rise after absorbing electromagnetic waves, thereby increasing the risk of fire hazards. The embodiment of the present disclosure uses an aqueous solution of ionic electrolyte as an absorbing material, which can solve this technical problem. (3) In the aqueous solution of ionic electrolyte, the arrangement of water molecules is regular and uniform, so that its broadband absorbing ability is more uniform. (4) Compared with solid absorbing materials, the absorbing material provided by the embodiment of the present disclosure is in the form of a solution, and its texture uniformity is more excellent, which is conducive to achieving the same absorption effect for electromagnetic waves incident from different directions or positions, and improving the isotropic characteristics of the internal field distribution of the closed electromagnetic total reflection environment.

[0010] In some possible implementations, the ionic electrolyte includes at least one of sodium chloride, potassium chloride, sulfuric acid, phosphoric acid, sodium hydroxide, and potassium hydroxide.

[0011] In some possible implementations, the mass concentration of the ionic electrolyte in the absorbing material is m, and m is less than the saturated precipitation concentration of the ionic electrolyte.

[0012] In some possible implementations, the transmittance of the container to electromagnetic waves in a target frequency band is greater than or equal to 50%, and the target frequency band is 30 MHz to 70 GHz. It is expected that the transmittance of the container to electromagnetic waves is as high as possible to ensure that the electromagnetic waves in the closed electromagnetic total reflection environment are fully absorbed by the absorbing material, so that the absorbing device does not block any reflection boundary (for example, any metal component).

[0013] In some possible implementations, the container includes a container body, and the contour shape of the container body is a regular geometric shape to enhance the isotropy of the absorbing device to the electromagnetic wave field distribution.

[0014] In some possible implementations, the outline shape of the container body includes: spherical or cylindrical. This makes the absorbing material in the inner cavity of the container body also spherical or cylindrical, so as to achieve the same absorbing ability for electromagnetic waves with different incident angles in 3D or 2D situations.

[0015] On the other hand, an embodiment of the present disclosure provides an absorbing device, which includes: a support body and one or more absorbing devices; the absorbing device is as described in any one of the above items, and the absorbing device is supported by the support body.

[0016] The wave absorbing device provided by the embodiment of the present disclosure has all the advantages of the wave absorbing devices mentioned above.

[0017] In some possible implementations, the absorbing device includes a coplanar absorbing group, and the coplanar absorbing group includes a plurality of the absorbing devices distributed at intervals.

[0018] In some possible implementations, there is at least one minimum repeating unit in the arrangement structure formed by the plurality of absorbing devices included in the coplanar absorbing group, and the minimum repeating unit is formed by the cooperation of at least two adjacent absorbing devices.

[0019] By arranging the minimum repeating units, the arrangement structure of the absorbing device has regularity, which is not only conducive to controlling the absorbing mode of the absorbing device to obtain a controllable absorbing effect, but also conducive to ensuring the uniformity of the distribution of the electromagnetic field in the closed electromagnetic total reflection environment where the absorbing device is located.

[0020] In some possible implementations, the geometric shape of the minimum repeating unit includes at least one of a regular polygon, a rhombus, and a rectangle. Regular polygons include, but are not limited to, regular triangles (i.e., equilateral triangles), squares, regular pentagons, regular hexagons, regular octagons, regular decagons, and the like.

[0021] In some possible implementations, at least one of the wave absorbing components is shared by any two adjacent minimum repeating units.

[0022] The above-mentioned position arrangement of the absorbing components can help to further compact the structure of the coplanar absorbing group, reduce the space it occupies, and even achieve a single dense paving effect.

[0023] In some possible implementations, the wave absorbing device includes a plurality of coplanar wave absorbing groups, and the plurality of coplanar wave absorbing groups are distributed at intervals along a target direction, and the target direction is perpendicular to the plane where the coplanar wave absorbing groups are located.

[0024] By providing a plurality of coplanar wave absorbing groups, the number of wave absorbing devices can be increased as much as possible within a limited space, thereby achieving the purpose of optimizing the wave absorbing capability of the wave absorbing device.

[0025] In some possible implementations, the transmittance of the support body to electromagnetic waves in a target frequency band is greater than or equal to 50%, and the target frequency band is 30 MHz to 70 GHz.

[0026] In some possible implementations, the support body has one or more limiting structures, and the limiting structures are used to limit the absorbing device to the support body.

[0027] On the other hand, the embodiments of the present disclosure provide the application of any of the above-mentioned absorbing components or any of the above-mentioned absorbing devices in reducing the field strength in the shielding cavity.

[0028] On the other hand, an embodiment of the present disclosure provides an electric wave reverberation chamber test system, the electric wave reverberation chamber test system comprising: an absorbing module and a test antenna, the absorbing module comprising any one of the above-mentioned absorbing components or any one of the above-mentioned absorbing devices;

[0029] The absorbing module and the test antenna are both located in the radio wave reverberation chamber, and the absorbing module, the test antenna and the module to be tested do not contact each other.

[0030] The radio wave reverberation chamber test system provided by the embodiment of the present disclosure has all the advantages of the above-mentioned absorbing components or absorbing devices.

[0031] In some possible implementations, the absorbing module is located between the test antenna and the module to be tested.

[0032] Through the above arrangement, the wave absorbing module plays the role of a wave absorbing baffle (for example, a direct path wave absorbing baffle), and can also achieve the purpose of suppressing and blocking non-stirring signal components.

[0033] In some possible implementations, the radio wave reverberation chamber test system further includes: a signal generation or analysis module, a calibration antenna, and a stirring module;

[0034] The signal generating or analyzing module is located outside the radio wave reverberation chamber, and the signal generating or analyzing module is electrically connected to the test antenna;

[0035] The calibration antenna and the stirring module are both located inside the radio wave reverberation chamber. The calibration antenna is electrically connected to the signal generation or analysis module during calibration operations. The stirring module is used to change the electromagnetic field distribution inside the radio wave reverberation chamber by stirring.

[0036] In some possible implementations, the absorbing module includes a coplanar absorbing group, and the coplanar absorbing group includes a plurality of the absorbing devices distributed at intervals;

[0037] The maximum spacing between any two adjacent absorbing devices is L1, which is less than or equal to the entire wavelength of the electromagnetic wave at the highest test frequency. The electromagnetic wave is an electromagnetic wave signal existing in the radio wave reverberation chamber during the test operation of the radio wave reverberation chamber test system.

[0038] By making the maximum spacing between two adjacent absorbing devices in the coplanar absorbing group less than or equal to the entire wavelength of the electromagnetic wave at the highest test frequency, the test system can avoid diffraction / diffraction phenomena near the highest test frequency, ensuring that when electromagnetic waves are incident on the absorbing device, they can be fully and effectively intercepted by the absorbing material.

[0039] In some possible implementations, the minimum distance between the absorbing module and the test antenna is L21, and L21 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency;

[0040] The minimum distance between the absorbing module and the module to be tested is L22, and L22 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency;

[0041] The electromagnetic wave is an electromagnetic wave signal present in the radio wave reverberation chamber during the test operation of the radio wave reverberation chamber test system.

[0042] By making the minimum distance between the absorbing module and the test antenna and the module to be tested greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency, the absorbing module is kept as far away from the test antenna and the module to be tested as possible to avoid the absorbing module affecting the impedance matching of the test antenna and the module to be tested, thereby avoiding changing the antenna radiation characteristics and causing a decrease in test accuracy.

[0043] In some possible implementations, the radio wave reverberation chamber test system further includes: a calibration antenna, and the minimum distance between the absorbing module and the calibration antenna is L23, and L23 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency.

[0044] By making the minimum distance L23 between the absorbing module and the calibration antenna greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency, the absorbing module is kept as far away from the calibration antenna as possible to avoid the absorbing module affecting the impedance matching of the calibration antenna itself, thereby avoiding changing the antenna radiation characteristics and causing a decrease in test accuracy.

[0045] In some possible implementations, the minimum distance between the absorbing module and any metal component is L3, L3 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency, and the electromagnetic wave is the electromagnetic wave signal existing in the radio wave reverberation chamber during the test operation of the radio wave reverberation chamber test system.

[0046] By making the minimum distance between the absorbing module and any metal component greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency, the absorbing module is prevented from blocking the reflection interface of the radio wave reverberation chamber, thereby effectively avoiding the deterioration of field uniformity.

[0047] On the other hand, the embodiment of the present disclosure provides a method for determining a loading amount, which is used to determine the loading amount of an absorbing device in an electric wave reverberation chamber, comprising:

[0048] Acquire a first field strength and a second field strength, wherein the first field strength is the field strength when the number of absorbing devices in the radio wave reverberation chamber is 0, and the second field strength is the field strength when the number of absorbing devices in the radio wave reverberation chamber is 1;

[0049] According to the first field strength and the second field strength, respectively obtain a first equivalent absorption cross-sectional area and a second equivalent absorption cross-sectional area, wherein the first equivalent absorption cross-sectional area is an equivalent absorption cross-sectional area of ​​a single absorbing device in the radio wave reverberation chamber, and the second equivalent absorption cross-sectional area is an equivalent absorption cross-sectional area of ​​the absorbing device required under the target field strength;

[0050] Determining a loading amount of the absorbing device according to the first equivalent absorption cross-sectional area and the second equivalent absorption cross-sectional area;

[0051] The target field strength is the field strength requirement when performing testing operations in the radio wave reverberation chamber.

[0052] In some possible implementations, determining the loading amount of the absorbing device according to the first equivalent absorption cross-sectional area and the second equivalent absorption cross-sectional area includes:

[0053] The second equivalent absorption cross-sectional area is divided by the first equivalent absorption cross-sectional area, and the obtained value is used as the loading amount of the absorbing device.

[0054] The method for obtaining the loading amount of an absorbing device provided in the embodiment of the present disclosure only requires two field strength tests to determine the loading number of the absorbing device, thus avoiding repeated experiments and significantly improving the acquisition efficiency. According to tests, the efficiency of obtaining the loading amount of an absorbing device in the embodiment of the present disclosure is at least 10 times higher than that in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1A schematic structural diagram of an exemplary wave absorbing device provided in an embodiment of the present disclosure;

[0056] Figure 2 A schematic diagram of the wave absorption principle of an aqueous solution of an ionic electrolyte provided in an embodiment of the present disclosure;

[0057] Figure 3 A schematic diagram of the structure of an exemplary container provided in an embodiment of the present disclosure;

[0058] Figure 4 A schematic structural diagram of another exemplary container provided in an embodiment of the present disclosure;

[0059] Figure 5 A schematic diagram of the structure of an exemplary radio reverberation chamber testing system provided in an embodiment of the present disclosure;

[0060] Figure 6 A schematic structural diagram of an exemplary wave absorbing device provided in an embodiment of the present disclosure;

[0061] Figure 7 A schematic structural diagram of another exemplary wave absorbing device provided in an embodiment of the present disclosure;

[0062] Figure 8 A schematic structural diagram of an exemplary coplanar absorbing group provided in an embodiment of the present disclosure;

[0063] Fig. 9 A schematic structural diagram of another exemplary coplanar absorbing group provided in an embodiment of the present disclosure;

[0064] Fig.10 A schematic structural diagram of another exemplary radio reverberation chamber testing system provided by an embodiment of the present disclosure;

[0065] Fig.11 A schematic diagram of a partial structure of another exemplary wave absorbing device provided in an embodiment of the present disclosure;

[0066] Fig.12 A schematic diagram of signal transmission in a no-load state of an exemplary radio reverberation chamber test system provided by an embodiment of the present disclosure;

[0067] Fig.13 A schematic diagram of signal transmission of an exemplary radio reverberation chamber test system provided in an embodiment of the present disclosure when loaded with an absorbing device;

[0068] Fig.14 A bottom cross-sectional view of an exemplary wave absorbing device provided in an embodiment of the present disclosure;

[0069] Fig.15 A schematic diagram of an exemplary arrangement of an absorbing device provided in an embodiment of the present disclosure;

[0070] Fig.16 A logic flow chart of an exemplary method for determining a load provided in an embodiment of the present disclosure;

[0071] Fig.17 A line graph of the test results of the field intensity suppression value and the measurement uncertainty of Example 1 and Comparative Example 1 provided as the test examples;

[0072] Fig.18 A line graph of the test results of the out-of-band spurious test of Example 1 and Comparative Example 1 provided as test examples.

[0073] The reference numerals represent:

[0074] 10. Wave absorbing devices;

[0075] 11. container; 111. container body; 112. cover body;

[0076] 12. Absorbing materials;

[0077] 20. Support body;

[0078] 21. Support plate;

[0079] 22. Limiting structure; 2201. First limiting groove; 2202. Second limiting groove;

[0080] 23. Mobile structure;

[0081] 100. wave absorbing device; 101. coplanar wave absorbing group;

[0082] 1000, wave absorbing module;

[0083] 2000, test antenna;

[0084] 3000, module to be tested;

[0085] 4000, radio reverberation chamber;

[0086] 5000, signal generation or analysis module;

[0087] 6000, calibrate antenna;

[0088] 7000, stirring module; 701, vertical mechanical stirrer; 702, horizontal mechanical stirrer;

[0089] 8000, turntable. DETAILED DESCRIPTION

[0090] In the description of the embodiments of the present disclosure, it should be understood that the terms "upper", "lower", "top", "bottom", "vertical", "horizontal", "thickness", "height" and the like indicate orientations or positional relationships, which are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present disclosure.

[0091] For example, the directional terms "top", "bottom", etc. are generally based on the relative relationship of the device or component currently in the drawing. When the product is placed in different postures, the orientation may change.

[0092] The radio reverberation chamber test system can support the TRP index test of low-frequency modules. However, due to the high field strength characteristics of the radio reverberation chamber, it will stimulate itself to produce serious passive intermodulation (PIM) under high power conditions, thereby raising the noise floor of the radio reverberation chamber test system, resulting in out-of-band spurious and adjacent channel power leakage ratio (ACLR) and other indicators unable to meet the test requirements.

[0093] It can be seen that it is necessary to reduce the field strength inside the radio wave reverberation chamber to reduce the power density on the surface of the PIM source, thereby achieving the purpose of reducing the PIM power in the radio wave reverberation chamber.

[0094] In view of the technical problems existing in the related art, the present disclosure provides an absorbing device 10, as shown in the attached Figure 1 As shown, the absorbing device 10 includes: a container 11 and an absorbing material 12 contained in the container 11; the absorbing material 12 includes water and an ionic electrolyte, and the ionic electrolyte is dissolved in the water; and the container 11 is a non-metallic container.

[0095] The absorbing device 10 provided by the embodiment of the present disclosure, the absorbing material 12 includes water and an ionic electrolyte dissolved in water, so that the absorbing material 12 is an aqueous solution of the ionic electrolyte. When the absorbing device 10 is applied to a closed electromagnetic total reflection environment, the absorbing material 12 in the form of an aqueous solution of the ionic electrolyte can convert electromagnetic energy into kinetic energy, and then convert the kinetic energy into heat energy through friction, so as to reduce the field intensity in the closed electromagnetic total reflection environment, so that the power density on the surface of the PIM source in the closed electromagnetic total reflection environment is reduced, thereby reducing the PIM power excited by the closed electromagnetic total reflection environment itself. In addition, the absorbing device 10 uses a container 11 to accommodate the absorbing material 12 in the form of a solution, and by making the container 11 a non-metallic container, electromagnetic waves are allowed to pass through the container 11 as unimpeded as possible to be incident on the absorbing material 12, so that the absorbing material 12 can fully exert its absorbing function.

[0096] In addition to the above-mentioned effect of reducing the field intensity, the aqueous solution of ionic electrolyte as the absorbing material 12 has at least the following advantages: (1) The aqueous solution of ionic electrolyte itself is a nonlinear material that cannot produce passive intermodulation, and will not introduce new PIM sources into the closed electromagnetic total reflection environment in which it is located. (2) The aqueous solution of ionic electrolyte has a small temperature rise after absorbing electromagnetic waves, so that the risk of fire hazards can be significantly reduced (that is, the EHS risk is reduced). For example, the related art uses a pyramidal absorbing material 12, which is flammable and has a high temperature rise after absorbing electromagnetic waves, thereby increasing the risk of fire hazards. The embodiment of the present disclosure uses an aqueous solution of ionic electrolyte as the absorbing material 12, which can solve this technical problem. (3) In the aqueous solution of ionic electrolyte, the arrangement of water molecules is regular and uniform, so that its broadband absorbing ability is more uniform. (4) Compared with the solid absorbing material 12, the absorbing material 12 provided in the embodiment of the present disclosure is in the form of a solution, and its texture uniformity is more excellent, which is conducive to achieving the same absorption effect for electromagnetic waves incident from different directions or positions, and improving the isotropic characteristics of the internal field distribution of the closed electromagnetic total reflection environment.

[0097] The "closed electromagnetic total reflection environment" mentioned above includes but is not limited to: radio wave reverberation chamber, metal shielding chamber, etc. For example, the absorbing device 10 provided in the embodiment of the present disclosure can be used in a radio wave reverberation chamber to obtain a radio wave reverberation chamber test system loaded with an aqueous solution of ionic electrolytes, so as to achieve the purpose of reducing the PIM power generated by the radio wave reverberation chamber test system itself and improve the dynamic range of the radio wave reverberation chamber test system. Taking the radio wave reverberation chamber test system as an example, the lower the background noise, the greater the distance between the background noise and the indicator to be measured, and this distance is the above-mentioned dynamic range.

[0098] Any neutral electrolyte, acidic electrolyte, and alkaline electrolyte are suitable for the embodiments of the present disclosure. In some examples, the ionic electrolyte can be a strong electrolyte to ensure that it is completely ionized in water to obtain more uniform broadband absorbing performance.

[0099] Strong electrolytes include: strong acids (for example, sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, etc.), strong bases (for example, sodium hydroxide, potassium hydroxide, lithium hydroxide, barium hydroxide, calcium hydroxide, etc.), and positive salts (for example, sodium chloride, potassium chloride, barium chloride, sodium carbonate, potassium carbonate, silver nitrate, etc.), all of which are suitable as ionic electrolytes involved in the embodiments of the present disclosure.

[0100] Illustratively, the ionic electrolyte used in the embodiments of the present disclosure includes at least one of sodium chloride, potassium chloride, sulfuric acid, phosphoric acid, sodium hydroxide, and potassium hydroxide.

[0101] The following will take sodium chloride as an example to describe the wave absorption principle of sodium chloride aqueous solution as an ionic electrolyte:

[0102] Water molecules are typical polar molecules. The two hydrogen-oxygen covalent bonds form a fixed angle of 104.45 degrees, which causes the centers of positive and negative charges to not coincide, making the water molecules look similar to electric dipoles. Electric dipoles have dipole moments, which rotate and oscillate violently with the changes in the electromagnetic field in the electromagnetic environment, and can convert electromagnetic energy into kinetic energy, and finally convert kinetic energy into heat energy through friction, achieving wave absorption. In addition, the specific heat capacity of water is 4.2×10 3 J / (kg·K), which is the largest in nature. Compared with other materials, water has a smaller temperature rise after absorbing the same amount of electromagnetic energy.

[0103] Ionic electrolytes have equal amounts of positive and negative ions. Thus, by adding ionic electrolytes to water, the positive and negative ions can form a large number of ion pair "cages" to bind water molecules, making the water molecules arranged regularly, thereby making the broadband absorption performance of the aqueous solution of ionic electrolytes more uniform. Figure 2 The example shows that sodium chloride contains an equal amount of positive ions Na + and negative ions Cl - , Na + and Cl - Form a large number of ion pair "cages" to bind water molecules (H 2 O) to constrain the water molecules so that they are arranged regularly, thereby making the absorbing ability of the absorbing material 12 more uniform.

[0104] As described above, the absorbing material 12 is an aqueous solution of an ionic dielectric, wherein the mass concentration of the ionic electrolyte in the absorbing material 12 is m. In the embodiment of the present disclosure, it is expected that m is less than the saturated precipitation concentration of the ionic electrolyte, so as to ensure that the positive and negative ions in the ionic dielectric are fully ionized, and to ensure that the absorbing material 12 is in the form of a stable solution.

[0105] In some examples, the mass concentration m of the ionic electrolyte is also greater than or equal to 0.5%. For example, the mass concentration m of the ionic electrolyte ranges from but is not limited to: 0.5% to 90%, 0.5% to 80%, 0.5% to 70%, 0.5% to 60%, 0.5% to 50%, 0.5% to 40%, 0.5% to 30%, 0.5% to 20%, 0.5% to 10%, etc.

[0106] One example is that the mass concentration m of the ionic electrolyte ranges from 0.5% to 10%, including but not limited to: 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 10%, etc., which is conducive to making the aqueous solution of the ionic dielectric achieve better texture uniformity and make its broadband absorption performance more uniform.

[0107] For the container 11 for containing the absorbing material 12, on the one hand, the container 11 is required to be able to fully transmit electromagnetic waves, so as to avoid introducing new PLM sources, so the container 11 is limited to be a non-metallic container. On the other hand, the container 11 is required to have a specific shape to shape the absorbing material 12 in solution form so that the absorbing material 12 maintains a specific shape, because the morphology of the absorbing material 12 in solution form depends on the container 11.

[0108] Regarding the material of the container 11, in some examples, the transmittance of the container 11 to electromagnetic waves in the target frequency band is greater than or equal to 50%, wherein the target frequency band is 30 MHz to 70 GHz. In particular, the target frequency band can be a GHz frequency band, for example, its range includes but is not limited to: 1 GHz to 70 GHz, etc.

[0109] The transmittance of the container 11 to electromagnetic waves in the target frequency band may also be greater than or equal to 60%, greater than or equal to 70%, greater than or equal to 80%, greater than or equal to 90%, greater than or equal to 95%, etc.

[0110] The disclosed embodiment expects that the electromagnetic wave transmittance of the container 11 is as high as possible to ensure that the electromagnetic waves in the closed electromagnetic total reflection environment are fully absorbed by the absorbing material 12, so as to achieve the purpose that the absorbing device 10 does not block any reflective boundary (for example, any metal component).

[0111] One example is that the transmittance of the container 11 to electromagnetic waves in the target frequency band is 90% to 100%, including but not limited to: 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, etc. When the transmittance of the container 11 is high enough, the container 11 can be considered as an electromagnetic transparent material.

[0112] In addition, for the non-metallic materials involved in the container 11, in addition to satisfying that its transmittance to electromagnetic waves in the target frequency band is greater than or equal to 50%, the non-metallic materials can also have at least one of the following functional characteristics to give the container 11 more functional characteristics, which include but are not limited to: high flame retardancy, acid and alkali resistance, high mechanical strength, etc.

[0113] In some examples, the non-metallic materials used to prepare the container 11 having the above-mentioned wave-transmitting characteristics include, but are not limited to: high-density polyethylene (HDPE), polytetrafluoroethylene (PTFE), chlorinated polyvinyl chloride (CPVC), polypropylene (PP), polyethyleneterephthalate (PET), etc. One example is to use one of high-density polyethylene, polytetrafluoroethylene, and chlorinated polyvinyl chloride to prepare the container.

[0114] By limiting the wave transmittance and material of the container 11 as above, it is ensured that the container 11 does not serve as a PIM source and that electromagnetic waves enter the absorbing material 12 as unimpeded as possible.

[0115] For the structural aspects of the container 11, see Figure 3 and Figure 4 One example is that the container 11 includes: a container body 111, a cover body 112 and an opening (not shown in the figure, blocked by the cover body 112), the opening is connected to the container body 111 and is conductive to allow the absorbing material 12 to enter therethrough, and the cover body 112 is connected to the opening to seal the opening.

[0116] The opening may be an opening formed on the wall of the container body 111, or may be a tube connected to the container body 111 and protruding from the surface of the container body 111. For example, Figure 3 and Figure 4 The example shows that the opening is a tube protruding from the top surface of the container body 111. The connection between the cover 112 and the opening includes, but is not limited to, threaded connection, plug connection, and snap connection.

[0117] In some examples, a sealing ring may be provided between the cover 112 and the opening to ensure the sealing of the inner cavity of the container 11 and effectively prevent the water in the absorbing material 12 in the form of a solution from evaporating.

[0118] The materials of the container body 111 , the cover body 112 , and the opening in the form of a tube may be the same or different, and all three may be selected from the non-metallic materials mentioned above.

[0119] In some examples, the absorbing material 12 is contained inside the cavity of the container body 111. Since the cover 112 is usually protruded from the outside of the container body 111, the absorbing material 12 is only contained inside the container body 111, so that the shape of the absorbing material 12 can be limited by adjusting the shape of the container body 111, making the shape of the absorbing material 12 more regular and controllable.

[0120] According to actual application requirements, the contour shape of the container body 111 can be a regular geometric shape, or an irregular geometric shape. The "contour shape" involved in the embodiments of the present disclosure includes not only the outer contour shape, but also the inner contour shape. For example, when the container body 111 is designed with equal wall thickness, its outer contour shape is the same as its inner contour shape, and the only difference is the size.

[0121] In some examples, in order to improve the isotropy of the absorbing device 10 to the electromagnetic wave field distribution, the contour shape of the container body 111 can be made into a regular geometric shape, which can include making the outer contour shape and the inner contour shape of the container body 111 both regular geometric shapes. Some regular geometric shapes include, but are not limited to: sphere, cylinder, ellipsoid, cuboid, cube, etc.

[0122] In one example, the outline shape of the container body 111 includes: a spherical shape (see Figure 4 ) or cylindrical (see Figure 3 ), which makes the absorbing material 12 in the inner cavity of the container body 111 also spherical or cylindrical, so as to achieve the same absorbing ability for electromagnetic waves with different incident angles in 3D or 2D situations. For example, when the absorbing device 10 is loaded into the inside of the radio wave reverberation chamber 4000, it can avoid destroying the isotropy of the field distribution inside the radio wave reverberation chamber 4000 to the greatest extent, thereby significantly improving the test accuracy of the radio wave reverberation chamber test system.

[0123] In addition, as for the wall thickness of the container body 111 , the smaller the wall thickness of the container body 111 is, the better, provided that no liquid leakage is achieved, so as to avoid electromagnetic wave loss caused by the container 11 as much as possible.

[0124] It is known from the test that the wave absorbing device 10 provided in the embodiment of the present disclosure has a PIM suppression effect of 7dB to 12dB, meeting the spurious test requirement of -43dBm / MHz.

[0125] On the other hand, if the Figure 6 As shown, the embodiment of the present disclosure further provides an absorbing device 100 , which includes: a support body 20 , and one or more absorbing devices 10 , wherein the absorbing device 10 is as described above, and the absorbing device 10 is supported by the support body 20 .

[0126] The absorbing device 100 provided in the embodiment of the present disclosure limits and stabilizes the position of the absorbing device 10 through the support body 20, wherein the number of the absorbing devices 10 can be one, two, or more than two. The absorbing device 100 has all the advantages of the absorbing device 10 mentioned above.

[0127] In some examples, such as the attached Figure 6 and attached Figure 7 As shown, the wave absorbing device 100 includes a coplanar wave absorbing group 101, and the coplanar wave absorbing group 101 includes a plurality of wave absorbing devices 10 distributed at intervals. The "coplanar wave absorbing group 101" referred to herein means that the plurality of wave absorbing devices 10 are coplanarly arranged along the same plane. Figure 6 The example shows that only one layer of absorbing devices 10 is arranged in the coplanar absorbing group 101 in the direction perpendicular to the paper surface. Figure 7 The example shows that two layers of absorbing devices 10 are arranged in a coplanar absorbing group 101 along a direction perpendicular to the paper surface.

[0128] When the absorbing device 100 is applied in a certain application scenario, the coplanar absorbing groups 101 can be coplanar not only in the horizontal direction but also in the vertical direction, or in other directions between the horizontal and vertical directions in the current application scenario.

[0129] For example, the wave absorbing device 100 is applied to an electric wave reverberation chamber test system. Figure 6 and Figure 7 It is illustrated that the multiple absorbing devices 10 in the coplanar absorbing group 101 can be coplanar along the horizontal direction.

[0130] For the coplanar absorbing group 101 , the multiple absorbing devices 10 included therein are distributed at intervals, which can not only avoid mutual shielding between the absorbing devices 10 and thus avoid deterioration of the distribution uniformity of the electromagnetic field, but also help to improve the absorbing efficiency of the absorbing devices 10 .

[0131] One example is that the multiple absorbing devices 10 included in the coplanar absorbing group 101 can be distributed at intervals in any shape, that is, the arrangement structure of the absorbing devices 10 can be irregular, and the arrangement structure of the absorbing devices 10 can be determined according to actual needs.

[0132] Another example is that there is at least one minimum repeating unit in the arrangement structure formed by the multiple absorbing devices 10 included in the coplanar absorbing group 101, and the minimum repeating unit is composed of at least two adjacent absorbing devices 10. For example, the number of absorbing devices 10 included in the minimum repeating unit can be two, three, four, five, six, seven, eight, nine, ten, or more.

[0133] By arranging the minimum repeating units, the arrangement structure of the absorbing device 10 has regularity, which is not only conducive to controlling the absorbing mode of the absorbing device 100 to obtain a controllable absorbing effect, but also conducive to ensuring the uniformity of the distribution of the electromagnetic field in the closed electromagnetic total reflection environment where the absorbing device 100 is located.

[0134] In some examples, the geometric shape of the minimum repeating unit includes at least one of a regular polygon, a rhombus, and a rectangle, wherein the regular polygon includes but is not limited to: a regular triangle (i.e., an equilateral triangle), a square, a regular pentagon, a regular hexagon, a regular octagon, a regular decagon, etc.

[0135] Figure 8 The geometric shape of the smallest repeating unit is an equilateral triangle. Fig. 9 The geometric shape of the smallest repeating unit is illustrated as a square.

[0136] One example is that the geometric shape of the minimum repeating unit is an equilateral triangle, which, as a favorable loading method of the absorbing device 10, is not only conducive to simplifying the number of minimum repeating units, thereby compacting the structure of the coplanar absorbing group 101, but also conducive to controlling the side length of the minimum repeating unit, thereby achieving full absorption of electromagnetic waves and improving the absorbing efficiency.

[0137] In the coplanar absorbing group 101 , when there are multiple minimum repeating units, at least one of the multiple minimum repeating units can be arranged independently of each other, and at least two of the multiple minimum repeating units can also share one or more absorbing devices 10 with each other.

[0138] See also Fig.10 The minimum repeating unit A1 in is arranged independently relative to other minimum repeating units. Fig.10 The minimum repeating units A2 and A3 in the embodiment share two absorbing devices 10 with each other.

[0139] See also Fig. 9The minimal repeating unit B1 in is arranged independently relative to other minimal repeating units. Fig. 9 The minimum repeating units B2 and B3 in the embodiment share two absorbing devices 10 with each other.

[0140] In some examples, for a coplanar absorbing group 101 arranged with minimal repeating units, there is at least one absorbing device 10 shared by any two adjacent minimal repeating units, wherein the number of shared absorbing devices 10 may be one, two, three or more.

[0141] Taking the solution in which the minimum repeating unit is an equilateral triangle as an example, multiple minimum repeating units may be independent of each other, or one absorbing device 10 may be shared by any two adjacent minimum repeating units, or two absorbing devices 10 may be shared by any two adjacent minimum repeating units.

[0142] The above-mentioned position arrangement of the absorbing devices 10 can help to further compact the structure of the coplanar absorbing group 101, reduce the space occupied by it, and even achieve a single dense paving effect.

[0143] When the absorbing device 100 contains a large number of absorbing devices 10, the coplanar absorbing groups 101 can be arranged as multiple groups, that is, the absorbing device 100 includes multiple groups of coplanar absorbing groups 101, and the multiple groups of coplanar absorbing groups 101 are distributed at intervals along a target direction, wherein the target direction is perpendicular to the plane where the coplanar absorbing groups 101 are located.

[0144] For example, if Figure 6 and attached Figure 7 As shown, when the multiple absorbing devices 10 in the coplanar absorbing group 101 are spaced apart along the horizontal direction, the multiple groups of coplanar absorbing groups 101 can be spaced apart along the vertical direction. Of course, when the multiple absorbing devices 10 in the coplanar absorbing group 101 are spaced apart along the vertical direction, the multiple groups of coplanar absorbing groups 101 can be spaced apart along the horizontal direction.

[0145] By providing a plurality of coplanar wave absorbing groups 101 , the number of wave absorbing devices 10 can be increased as much as possible within a limited space, thereby achieving the purpose of optimizing the wave absorbing capability of the wave absorbing device 100 .

[0146] The multiple groups of coplanar absorbing groups 101 are spaced apart in a target direction through the support body 20 , ensuring that the absorbing devices 10 in each coplanar absorbing group 101 do not contact each other.

[0147] The number of the coplanar absorbing groups 101 can be adaptively adjusted according to actual application scenarios. For example, the number of the coplanar absorbing groups 101 can be two, three, four, five, six, seven, eight, etc.

[0148] In the disclosed embodiment, it is expected that the support 20 has a transmittance greater than or equal to 50% for electromagnetic waves in the target frequency band, which is 30 MHz to 70 GHz. In particular, the target frequency band may be a GHz frequency band, for example, the range includes but is not limited to: 1 GHz to 70 GHz.

[0149] The transmittance of the support body 20 to electromagnetic waves in the target frequency band may also be greater than or equal to 60%, greater than or equal to 70%, greater than or equal to 80%, greater than or equal to 90%, greater than or equal to 95%, etc.

[0150] The disclosed embodiment expects that the electromagnetic wave transmittance of the support body 20 is as high as possible to ensure that the electromagnetic waves in the closed electromagnetic total reflection environment are fully absorbed by the absorbing material 12. An example is that the electromagnetic wave transmittance of the support body 20 to the target frequency band is 90% to 100%, which includes but is not limited to: 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, etc. At this time, the support body 20 can also be considered as an electromagnetic transparent material.

[0151] The support 20 may be made of non-metallic materials, which also need to satisfy the requirement that the transmittance of electromagnetic waves in the target frequency band is greater than or equal to 50%. Furthermore, the type of non-metallic material may be selected based on at least one of the following functional characteristics: high flame retardancy, acid and alkali resistance, high mechanical strength, etc.

[0152] In some examples, the non-metallic material used to prepare the support body 20 having the above-mentioned wave-transmitting characteristics may be a polymer material, and the polymer material may include but is not limited to: high-density polyethylene (HDPE), polytetrafluoroethylene (PTFE), chlorinated polyvinyl chloride (CPVC), etc.

[0153] By limiting the transmittance and material of the support body 20 as above, it is ensured that the support body 20 does not serve as a PIM source and that electromagnetic waves enter the absorbing material 12 as unimpeded as possible, thereby achieving that the absorbing device 100 does not block any reflective boundary, such as metal material.

[0154] In some examples, such as the attached Fig.11 As shown, the support body 20 has one or more limiting structures 22, which are used to limit the absorbing device 10 to the support body 20. The absorbing device 10 is fixed to the support body 20 by the limiting structures 22 to stabilize its position.

[0155] The limiting structure 22 can be directly formed on the support body 20, for example, the limiting structure 22 is provided in the form of a limiting groove on the corresponding wall of the support body 20. Alternatively, the limiting structure 22 can also be arranged independently of the support body 20, for example, the limiting structure 22 is in the form of a limiting block and connected to the corresponding wall of the support body 20. In this way, the types of the limiting structure 22 include but are not limited to: a clamp structure, a claw structure, an elastic sleeve structure, etc.

[0156] In some examples, Fig.11 The limiting structure 22 is exemplified as a limiting groove formed on the corresponding wall of the support body 20. By providing the limiting groove on the support body 20, not only the absorbing device 10 can be limited, but also the design of the limiting groove reduces the wall thickness of the corresponding wall of the support body 20, which is conducive to reducing the overall height of the absorbing device 100 and reducing the space occupancy rate of the absorbing device 100.

[0157] When the limiting structure 22 is a limiting groove, the shape of the limiting groove is adapted to the shape of the container 11 of the absorbing device 10, and the two are clearance-matched. For example, when the contour shape of the container body 111 of the absorbing device 10 is a cylinder or a sphere, the limiting groove can be circular; when the contour shape of the container body 111 of the absorbing device 10 is a rectangular column, the limiting groove can be rectangular.

[0158] In some examples, the support body 20 includes: a support plate 21 having one or more limiting structures 22 on the support plate 21 , and the number of the limiting structures 22 on the support plate 21 is the same as the number of the absorbing devices 10 in the coplanar absorbing group 101 .

[0159] In some examples, when there is one coplanar absorbing group 101, the number of the support plates 21 may be one or two. When there is one support plate 21, the support plate 21 is used to limit the bottom of the absorbing device 10 in the coplanar absorbing group 101 through the limiting structure 22. When there are two support plates 21, the two support plates 21 limit the bottom and top of the absorbing device 10 in the coplanar absorbing group 101 through the limiting structure 22.

[0160] In some examples, when the coplanar absorbing groups 101 are arranged to be multiple and spaced apart, the number of the supporting plates 21 is also multiple, and the multiple supporting plates 21 correspond one-to-one to the multiple coplanar absorbing groups 101 , and the coplanar absorbing groups 101 are limited to the corresponding supporting plates 21 .

[0161] For the multi-layer support plates 21 involved above, the support plate 21 located at the bottom layer limits the bottom of the absorbing device 10 in the coplanar absorbing group 101 at the bottom layer, and the support plate 21 located at the top layer limits the top of the absorbing device 10 in the coplanar absorbing group 101 at the top layer, and the top and bottom surfaces of the remaining other support plates 21 respectively have limiting structures 22, the limiting structure 22 located on the top surface is used to limit the bottom of the absorbing device 10 in a group of coplanar absorbing groups 101, and the limiting structure 22 located on the bottom surface is used to limit the top of the absorbing device 10 in a group of coplanar absorbing groups 101.

[0162] It should be noted that the “bottom of the absorbing device 10 ” mentioned above refers to the bottom of the container body 111 of the absorbing device 10 , and the “top of the absorbing device 10 ” mentioned above may be the cover 112 of the container 11 of the absorbing device 10 .

[0163] When the number of the support plates 21 is set to be multiple, two adjacent support plates 21 may be connected by a connecting rod, or may be independent of each other and rely on the absorbing device 10 to act as a connecting rod.

[0164] In some examples, the support body 20 may further include: a movable structure 23, the movable structure 23 is connected to the bottom support plate 21, so that the position of the support body 20 is movable, for example, the movable structure 23 includes but is not limited to casters and the like.

[0165] The movable structure 23 facilitates the movement of the support body 20 . In particular, when the support body 20 carries a plurality of absorbers 10 , the support body 20 is heavy, and the movable structure 23 makes it more convenient and labor-saving to adjust the position of the support body 20 .

[0166] Regarding any of the above-mentioned absorbing devices 100, when used, the number of absorbing devices 100 can be one or more, and the arrangement positions of the multiple absorbing devices 100 can be adjusted according to the actual application scenario. For example, Figure 5 The example shows that two absorbing devices 100 are arranged side by side to improve the absorbing efficiency.

[0167] On the other hand, the embodiments of the present disclosure further provide the use of any of the above-mentioned absorbing devices 10 or any of the above-mentioned absorbing devices 100 in reducing the field strength in the shielding cavity.

[0168] The "shielding cavity" referred to herein may be an electromagnetic wave shielding cavity, for example, the frequency band of the electromagnetic wave may be 30 MHz to 70 GHz. The shielding cavity may be considered as an electrically large-sized total reflection cavity, for example, made of pure metal.

[0169] By placing the absorbing device 10 or the absorbing apparatus 100 in the shielding cavity, the field intensity inside the shielding cavity can be reduced, and based on the reduction of the field intensity, other properties of the shielding cavity can be regulated.

[0170] In the embodiments of the present disclosure, the shielded cavity involved herein includes but is not limited to: an electric wave reverberation chamber 4000, a metal shielded cavity, etc. One example is that the embodiments of the present disclosure provide the application of any of the above-mentioned absorbing devices 10, or any of the above-mentioned absorbing devices 100 in reducing the field strength in the electric wave reverberation chamber 4000. For example, when used in an electric wave reverberation chamber test system, by reducing the field strength in the electric wave reverberation chamber 4000, the test system noise floor can be reduced, the signal purity can be improved, and the adjacent channel power leakage ratio (ACLR) test accuracy can be improved.

[0171] Fig.12 An example of an electric wave reverberation chamber test system is provided, wherein the electric wave reverberation chamber 4000 is not loaded with an absorbing device 10 or an absorbing apparatus 100. Fig.12 The solid arrows in the figure represent the incident electromagnetic waves. Fig.12 The dotted line in represents the outgoing electromagnetic wave, and the thickness of the line represents the signal strength. Fig.12 It can be known that before the absorbing element 10 or the absorbing device 100 is loaded, the attenuation of electromagnetic waves incident from different directions when emitted is completely equal.

[0172] Fig.13 Another radio wave reverberation chamber test system is illustrated, wherein the radio wave reverberation chamber 4000 is loaded with an absorbing device 10 or an absorbing apparatus 100. Fig.13 The solid arrows in the figure represent the incident electromagnetic waves. Fig.13 The dotted line in represents the outgoing electromagnetic wave, and the thickness of the line represents the signal strength. Fig.13 It can be seen that after the absorbing device 10 or the absorbing apparatus 100 is loaded, the attenuation of electromagnetic waves incident from different directions is not equal when they are emitted. It can be seen that the absorbing device 10 or the absorbing apparatus 100 has an effective absorbing effect.

[0173] Any of the above-mentioned absorbing devices 10 or any of the above-mentioned absorbing apparatuses 100 provided in the embodiments of the present disclosure can be used in the testing scenario of high-power samples to be tested.

[0174] On the other hand, the present disclosure also provides an electric wave reverberation chamber test system, as shown in the attached Figure 5As shown, the radio wave reverberation chamber test system includes: an absorbing module 1000 and a test antenna 2000, and the absorbing module 1000 includes any of the above-mentioned absorbing devices 10, or any of the above-mentioned absorbing devices 100. The absorbing module 1000 and the test antenna 2000 are both located in the radio wave reverberation chamber 4000, and the absorbing module 1000, the test antenna 2000 and the module to be tested 3000 do not contact each other.

[0175] The radio wave reverberation chamber test system provided by the embodiment of the present disclosure has all the advantages of the above-mentioned absorbing device 10 or absorbing apparatus 100 .

[0176] In the radio wave reverberation chamber test system, the absorbing module 1000, the test antenna 2000 and the module to be tested 3000 do not contact each other to avoid the absorbing device 10 in the absorbing module 1000 being blocked, or the absorbing device 10 blocking the test antenna 2000 and the module to be tested 3000, thereby ensuring that the absorbing device 10 fully absorbs waves and improves the absorbing efficiency.

[0177] In the radio reverberation chamber test system, the radio reverberation chamber 4000 is an electrically oversized fully reflective metal cavity, which is used to provide a sufficient number of standing wave modes and mode density. The test antenna 2000 and the module under test 3000 transmit and receive signals, and the signal can be sent from the test antenna 2000 to the module under test 3000, or from the module under test 3000 to the test antenna 2000.

[0178] In some examples, the absorbing module 1000 is located between the test antenna 2000 and the module under test 3000. For example, the absorbing module 1000 can be perpendicular to the signal link between the test antenna 2000 and the module under test 3000, and further, perpendicular to the direct path in the signal link.

[0179] Through the above arrangement, the wave absorbing module 1000 plays the role of a wave absorbing baffle (for example, a direct-path wave absorbing baffle), and can also achieve the purpose of suppressing and blocking non-stirring signal components.

[0180] In some examples, such as the attached Figure 5 As shown, the radio wave reverberation chamber test system provided by the embodiment of the present disclosure also includes: a signal generating or analyzing module 5000, a calibration antenna 6000 and a stirring module 7000; the signal generating or analyzing module 5000 is located outside the radio wave reverberation chamber 4000, and the signal generating or analyzing module 5000 is electrically connected to the test antenna 2000; the calibration antenna 6000 and the stirring module 7000 are both located inside the radio wave reverberation chamber 4000, the calibration antenna 6000 is electrically connected to the signal generating or analyzing module 5000 when performing a calibration operation, and the stirring module 7000 is used to change the electromagnetic field distribution inside the radio wave reverberation chamber 4000 by stirring.

[0181] The signal generation or analysis module 5000 includes but is not limited to: at least one of a network analyzer, a spectrum analyzer, and a signal generator.

[0182] The stirring module 7000 includes but is not limited to: at least one of a vertical mechanical stirrer 701 and a horizontal mechanical stirrer 702, for example, includes both the vertical mechanical stirrer 701 and the horizontal mechanical stirrer 702. The vertical mechanical stirrer 701 is used to provide a mechanical stirring sample distributed along the vertical direction in the radio wave reverberation chamber 4000, and the horizontal mechanical stirrer 702 is used to provide a mechanical stirring sample distributed along the horizontal direction in the radio wave reverberation chamber 4000. The electromagnetic field distribution inside the radio wave reverberation chamber 4000 is changed by the stirring sample provided by the stirring module 7000.

[0183] The calibration antenna 6000 is used to calibrate the spatial insertion loss in the radio wave reverberation chamber 4000. When calibration operation is required, the calibration antenna 6000 is electrically connected to the signal generation or analysis module 5000. For example, the signal generator is electrically connected to the test antenna 2000 and the calibration antenna 6000 to measure the spatial insertion loss in the radio wave reverberation chamber 4000 so as to compensate for the spatial insertion loss during the test operation.

[0184] In some examples, such as the attached Figure 5 As shown, a turntable 8000 is also provided in the radio wave reverberation chamber 4000 , and the module to be tested 3000 and the calibration antenna 6000 are supported by the turntable 8000 , which can also provide a source stirring sample.

[0185] During the test operation, if the up-going wave is measured, the signal generation or analysis module 5000 can be, for example, a signal generator and sends an electromagnetic wave signal, and the module to be tested 3000 receives the electromagnetic wave signal. If the down-going wave is measured, the signal is sent by the module to be tested 3000. The signal generation or analysis module 5000 can be a spectrum analyzer and receive the electromagnetic wave signal.

[0186] For the radio wave reverberation chamber test system, the position arrangement of the absorbing device 10 in the absorbing module 1000 can be improved to further improve the test accuracy and effectively prevent the deterioration of measurement uncertainty, which includes but is not limited to the following position arrangement.

[0187] In some embodiments, as shown in Figure 6 As shown, the absorbing module 1000 includes a coplanar absorbing group 101, and the coplanar absorbing group 101 includes a plurality of absorbing devices 10 distributed at intervals, and the maximum distance between any two adjacent absorbing devices 10 is L1 (see further Figure 8 or Fig. 9), L1 is less than or equal to the whole wavelength of the electromagnetic wave at the highest test frequency, and the electromagnetic wave is the electromagnetic wave signal existing in the electromagnetic reverberation chamber 4000 during the test operation of the electromagnetic reverberation chamber test system. The "spacing" involved here refers to the distance between the outer walls of the absorbing device 10.

[0188] By making the maximum spacing between two adjacent absorbing devices 10 in the coplanar absorbing group 101 less than or equal to the entire wavelength of the electromagnetic wave at the highest test frequency, the test system can avoid the diffraction phenomenon near the highest test frequency, ensuring that when the electromagnetic wave is incident on the absorbing device 100 (especially when it is incident along the signal straight path), it can be fully and effectively intercepted by the absorbing material 12.

[0189] For example, the minimum repeating unit of the coplanar wave absorbing group 101 includes an equilateral triangle shape. Figure 8 As shown, the spacing between any two of the three absorbing devices 10 forming an equilateral triangle is equal, and the spacing is the maximum spacing L1 mentioned above, so that L1 is less than or equal to the entire wavelength of the electromagnetic wave at the highest test frequency. For example, when the highest test frequency is 7.5 GHz, the corresponding entire wavelength of the electromagnetic wave is 4 cm, then the spacing L1 between any two adjacent absorbing devices 10 is less than or equal to 4 cm, for example, L1 is 4 cm.

[0190] In other embodiments, as shown in the attached Fig.10 As shown, the absorbing module 1000 (for example, the coplanar absorbing group 101) is located between the test antenna 2000 and the module to be tested 3000, and the minimum spacing between the absorbing module 1000 and the test antenna 2000 is L21, L21 is greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency, wherein the minimum spacing L21 involved here refers to the smallest distance among the multiple distances between the test antenna 2000 and the outer wall of the multiple absorbing devices 10 in the absorbing module 1000. The minimum spacing between the absorbing module 1000 and the module to be tested 3000 is L22, L22 is greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency, wherein the minimum spacing L22 involved here refers to the smallest distance among the multiple distances between the test antenna 2000 and the outer wall of the multiple absorbing devices 10 in the absorbing module 1000.

[0191] By making the minimum distance between the absorbing module 1000 and the test antenna 2000 and the module to be tested 3000 greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency, the absorbing module 1000 is kept as far away from the test antenna 2000 and the module to be tested 3000 as possible, so as to avoid the absorbing module 1000 affecting the impedance matching of the test antenna 2000 and the module to be tested 3000, thereby avoiding changing the antenna radiation characteristics and causing a decrease in test accuracy.

[0192] For example, when the lowest test frequency is 400 MHz, the corresponding half wavelength of the electromagnetic wave is 37.5 cm, then L21 and L22 are both greater than or equal to 37.5 cm.

[0193] In other embodiments, as shown in the attached Fig.10 As shown, the radio reverberation chamber test system further includes: a calibration antenna 6000, and the minimum spacing between the absorbing module 1000 and the calibration antenna 6000 is L23, and L23 is greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency. The minimum spacing L22 involved here refers to the smallest distance among the multiple distances between the calibration antenna 6000 and the outer walls of the multiple absorbing devices 10 in the absorbing module 1000.

[0194] By making the minimum distance L23 between the absorbing module 1000 and the calibration antenna 6000 greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency, the absorbing module 1000 is kept as far away from the calibration antenna 6000 as possible to prevent the absorbing module 1000 from affecting the impedance matching of the calibration antenna 6000 itself, thereby avoiding changing the antenna radiation characteristics and causing a decrease in test accuracy.

[0195] In other embodiments, the minimum spacing between the absorbing module 1000 and any metal component is L3, L3 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency, and the electromagnetic wave is an electromagnetic wave signal present in the radio reverberation chamber 4000 during the test operation of the radio reverberation chamber test system. The minimum spacing L3 involved here refers to the smallest distance among multiple distances between any metal component and the outer wall of multiple absorbing devices 10 in the absorbing module 1000.

[0196] Among them, in the radio wave reverberation chamber test system, the metal parts include at least the walls of the radio wave reverberation chamber 4000, and may also include the mechanical stirrer in the stirring module 7000, the test antenna 2000, the calibration antenna 6000, etc.

[0197] By making the minimum distance between the absorbing module 1000 and any metal component greater than or equal to the half wavelength of the electromagnetic wave at the lowest test frequency, the absorbing module 1000 is prevented from shielding the reflection interface of the radio reverberation chamber 4000, thereby effectively preventing the deterioration of field uniformity.

[0198] It can be seen that the embodiment of the present disclosure avoids shielding between any absorbing devices 10 by arranging the positions of the absorbing devices 10 as described above, and also avoids the absorbing devices 10 shielding the test antenna 2000, the module to be tested 3000, the calibration antenna 6000, the metal wall of the radio wave reverberation chamber 4000 and other components, thereby achieving the purpose of improving the utilization efficiency of the absorbing devices 10, improving the absorbing efficiency, reducing the damage to the field uniformity, and effectively preventing the deterioration of the measurement uncertainty.

[0199] The following will further describe the position arrangement scheme of the wave absorbing module 1000 in the radio wave reverberation chamber 4000 in combination with an embodiment, wherein, after testing and calculation, it is determined that the optimal loading number of the wave absorbing device 10 in the radio wave reverberation chamber 4000 is 72. This embodiment arranges two wave absorbing devices 100, and the two wave absorbing devices 100 are arranged side by side in a direction perpendicular to the signal direct path to improve the wave absorbing efficiency. The signal direct path is the signal direct path between the test antenna 2000 and the module to be tested 3000.

[0200] Each absorbing device 100 carries 36 absorbing components 10, as shown in the attached figure. Fig.15 As shown, the wave absorbing device 100 includes six groups of coplanar wave absorbing groups 101 spaced apart in the vertical direction, combined with Figure 8 and Fig.14 As shown, each coplanar absorbing group 101 includes six absorbing devices 10 spaced apart along a horizontal plane, wherein any three adjacent absorbing components constitute a minimum repeating unit. Figure 8 As shown, the minimum repeating unit is in the shape of an equilateral triangle. Fig.15 Only three absorbing devices 10 on a single side of each coplanar absorbing group 101 in a direction perpendicular to the paper surface are illustrated.

[0201] As attached Fig.11 and attached Fig.15 As shown, the support body 20 in the absorbing device 100 includes seven layers of support plates 21, the top surface of the support plate 21 located at the bottom layer has a first limiting groove 2201 to accommodate the bottom of the container body 111 of the absorbing device 10 of the bottom layer, and the bottom surface of the support plate 21 located at the top layer has a second limiting groove 2202 to accommodate the cover 112 of the container body 111 of the absorbing device 10 of the top layer, and the top surface and bottom surface of the remaining five layers of support plates 21 respectively have the first limiting groove 2201 and the second limiting groove 2202 to respectively accommodate the bottom and cover 112 of the container body 111 of different absorbing devices 10.

[0202] This embodiment illustrates that the height of the wave absorbing device 100 is controlled within 140 cm to adapt to the conventional size of the radio reverberation chamber 4000. Specifically, the wave absorbing device 100 includes seven layers of support plates 21 and a mobile structure 23, and the mobile structure 23 is connected to the bottom support plate 21. The height of the mobile structure 23 can be designed to be 4 cm, the thickness of each layer of support plates 21 is designed to be 3 cm, and the spacing between any two adjacent layers of support plates 21 is designed to be 18 cm. Then, the height of the wave absorbing device 100 is (18 cm × 6) + (3 cm × 7) + 4 cm = 133 cm.

[0203] The positions of the absorbers 10 in each coplanar absorber group 101 can be arranged in the same manner, so that each absorber 10 will not directly block any reflective boundary (i.e., metal components) and will not block any other absorbing boundary (i.e., other absorbers 10). Fig.11 As shown, six first limiting grooves 2201 are provided on the top surface of the support plate 21 to accommodate the bottom of the container body 111 of the absorbing device 10. The six first limiting grooves 2201 are staggered in 2 rows × 3 columns. Any three adjacent first limiting grooves 2201 cooperate to form an equilateral triangle. The spacing (also called the net spacing) between the outer edges of any adjacent first limiting grooves 2201 is 4 cm. This is because the highest test frequency in the radio wave reverberation chamber 4000 is set to 7.5 GHz, and the corresponding full wavelength of the electromagnetic wave is 4 cm. Then, the spacing L1 between any two adjacent absorbing devices 10 is set to be equal to 4 cm to avoid diffraction or diffraction.

[0204] As attached Fig.11 As shown, the bottom surface of the support plate 21 is provided with six second limiting grooves 2202 to accommodate the cover 112 of the absorber 10. The six second limiting grooves 2202 are also staggered in 2 rows × 3 columns, and any three adjacent second limiting grooves 2202 cooperate to form an equilateral triangle. The central axis of the second limiting groove 2202 coincides with the central axis of the corresponding first limiting groove 2201.

[0205] On the other hand, the embodiment of the present disclosure further provides a method for determining a loading amount, and the method for determining a loading amount is used to determine the loading amount of the absorbing device 10 in the radio wave reverberation chamber 4000. The method for determining a loading amount comprises the following steps:

[0206] Step S1, obtaining a first field strength and a second field strength, wherein the first field strength is the field strength when the number of the absorbing devices 10 in the radio wave reverberation chamber 4000 is 0, and the second field strength is the field strength when the number of the absorbing devices 10 in the radio wave reverberation chamber 4000 is 1. The field strength is a physical quantity used to describe the energy storage capacity of the radio wave reverberation chamber 4000, and the unit is volt / meter (V / m).

[0207] Step S2: According to the first field strength and the second field strength, respectively obtain a first equivalent absorption cross-sectional area and a second equivalent absorption cross-sectional area, wherein the first equivalent absorption cross-sectional area is the equivalent absorption cross-sectional area of ​​a single absorbing device 10 in the radio wave reverberation chamber 4000, and the second equivalent absorption cross-sectional area is the equivalent absorption cross-sectional area of ​​the absorbing device 10 required under the target field strength. The target field strength is the field strength requirement value when performing the test operation in the radio wave reverberation chamber 4000.

[0208] Step S3: determining the loading amount of the absorbing device 10 according to the first equivalent absorption cross-sectional area and the second equivalent absorption cross-sectional area.

[0209] For step S1, obtaining the first field strength includes: testing the field strength inside the radio wave reverberation chamber 4000 with 0 absorbers 10 (i.e., testing the field strength of the radio wave reverberation chamber 4000 in an unloaded state) to obtain the first field strength. And obtaining the second field strength includes: testing the field strength of the radio wave reverberation chamber 4000 with 1 absorber 10 (i.e., testing the field strength of the radio wave reverberation chamber 4000 with 1 absorber 10 loaded) to obtain the second field strength. The field strength test involved above can be performed using a field strength tester or a spectrum analyzer.

[0210] For step S2, according to the first field strength and the second field strength, a first equivalent absorption cross-sectional area of ​​a single absorbing device 10 in the radio wave reverberation chamber 4000 is obtained, which includes: according to the first field strength and the second field strength, the first equivalent absorption cross-sectional area is calculated by formulas 1 to 5.

[0211] Formula 1 and Formula 2 correspond to the no-load state of the radio wave reverberation chamber 4000, respectively. Formula 1 is as follows:

[0212]

[0213] Among them, Q ul It represents the total composite quality factor of the radio reverberation chamber under unloaded conditions.

[0214] Q sd It represents the quality factor component under the influence of surface resistance dissipation of the metal structure of the radio reverberation chamber, where: μ r It represents the relative magnetic permeability of the metal structure of the radio wave reverberation chamber, δ represents the skin depth of the metal structure of the radio wave reverberation chamber, A represents the surface area of ​​the radio wave reverberation chamber, and V represents the cavity volume of the radio wave reverberation chamber.

[0215] Q abs,ul It represents the quality factor component under the influence of the absorber (or equivalent absorbing cross section) when the reverberation chamber is unloaded. Among them, π represents the circumference constant, λ represents the wavelength, σ u1 It represents the equivalent absorption cross section inside the radio reverberation chamber when it is unloaded.

[0216] Q ap It represents the quality factor component under the influence of the aperture (or equivalent transmission crosssection) in the radio reverberation room; Represents the equivalent transmission cross section inside the reverberation chamber.

[0217] Q ant represents the quality factor component under the influence of the antenna structure in the radio wave reverberation room, η tot Represents the overall efficiency of the antenna.

[0218] Formula 2 is as follows:

[0219]

[0220] Formula 3 and Formula 4 respectively correspond to the state of the radio wave reverberation chamber 4000 when an absorbing device 10 is loaded:

[0221] Formula 3 is as follows:

[0222]

[0223] Among them, Q 1 It represents the total composite quality factor of the radio reverberation chamber when the number of loaded absorbing devices 10 is 1; Q abs,1 It represents the quality factor component under the influence of the absorbing material (or equivalent absorption cross section) when the number of absorbing devices 10 loaded in the radio wave reverberation chamber is 1.

[0224] Formula 4 is as follows:

[0225]

[0226] Among them, σ 1 Represents the first equivalent absorption cross-sectional area.

[0227] Formula 5 is as follows:

[0228]

[0229] Among them, P t represents the power input into the radio reverberation chamber under steady-state conditions; c represents the speed of light; ε represents the dielectric constant. It means the first strong one; Indicates the second strong.

[0230] It can be seen that, according to the first field strength and the second field strength, the first equivalent absorption cross-sectional area of ​​the single absorbing device 10 in the radio wave reverberation chamber 4000 can be calculated.

[0231] For step S2, according to the first field strength and the second field strength, the second equivalent absorption cross-sectional area of ​​the single absorbing device 10 required for the absorbing device 10 in the radio wave reverberation chamber 4000 under the target field strength is obtained, which includes: according to the first field strength and the second field strength, the second equivalent absorption cross-sectional area is calculated by formulas 6 to 9.

[0232] Formula 6 and Formula 7 respectively correspond to the state where the radio wave reverberation chamber 4000 is loaded with N absorbing devices 10. Formula 6 is as follows:

[0233]

[0234] Among them, Q N It represents the total composite quality factor of the radio reverberation chamber when the number of loaded absorbing devices 10 is N; Q abs,N It represents the quality factor component under the influence of the absorbing material (or equivalent absorption cross section) when the number of absorbing devices 10 loaded in the radio wave reverberation chamber is N.

[0235] Formula 7 is as follows:

[0236]

[0237] Among them, σ N It represents the equivalent absorption cross-sectional area corresponding to N absorbing devices 10 .

[0238] Due to σ N =Nσ 1 , then we can get formula eight as follows:

[0239]

[0240] To achieve the target field strength, the calculation formula for the required second equivalent absorption cross-sectional area is shown in Formula 9, which is as follows:

[0241]

[0242] Among them, σ l represents the second equivalent absorption cross-sectional area, Indicates the target field strength, which is the preset value; Indicates the first strong.

[0243] For step S3 , the loading amount of the absorbing device 10 is determined according to the first equivalent absorption cross-sectional area and the second equivalent absorption cross-sectional area, which includes: dividing the second equivalent absorption cross-sectional area by the first equivalent absorption cross-sectional area, and the obtained value is used as the loading amount of the absorbing device 10 .

[0244] This can be seen in Formula 10, which is as follows:

[0245]

[0246] Wherein, N represents the loading amount of the absorbing device 10 .

[0247] Based on the above, a logical flow chart of the method for determining the load amount provided by the embodiment of the present disclosure can be obtained, see Fig.16 .

[0248] In summary, the method for determining the loading amount provided in the embodiment of the present disclosure tests the first field strength when the absorbing device 10 is unloaded in the radio wave reverberation chamber 4000 and the second field strength when a single absorbing device 10 is loaded. Based on the first field strength and the second field strength, the first equivalent absorption cross-sectional area of ​​the single absorbing device 10 in the radio wave reverberation chamber 4000 and the second equivalent absorption cross-sectional area of ​​the absorbing device 10 required under the target field strength can be calculated. The loading amount of the absorbing device 10 is further calculated based on the first equivalent absorption cross-sectional area and the second equivalent absorption cross-sectional area. The method for determining the loading amount provided in the embodiment of the present disclosure tests the first field strength and the second field strength, and then performs relevant calculations based on the first field strength and the second field strength to obtain the loading amount of the absorbing device 10. It can be seen that this makes the determination process of the loading amount of the absorbing device 10 not only faster and more efficient, but also more accurate, and significantly improves the efficiency of setting up the test environment.

[0249] In the related art, the process of obtaining the loading amount of the absorbing device 10 in the radio wave reverberation chamber 4000 is usually as follows: a certain amount of absorbing devices 10 are loaded into the radio wave reverberation chamber 4000, and the current field strength of the radio wave reverberation chamber 4000 in the current state is tested, and the current field strength is compared with the target field strength. If the current field strength is less than the target field strength, the number of absorbing devices 10 is reduced, and conversely, if the current field strength is greater than the target field strength, the number of absorbing devices 10 is increased. Through repeated comparisons, the current field strength is finally made equal to the target field strength, thereby completing the acquisition of the loading amount of the absorbing device 10. It can be seen that the method for obtaining the loading amount of the absorbing device 10 in the related art has a large number of repetitions and a low efficiency.

[0250] Compared with the related art, the method for obtaining the loading amount of the absorbing device 10 provided in the embodiment of the present disclosure only requires two field strength tests to determine the loading number of the absorbing device 10, thereby avoiding repeated experiments and significantly improving the acquisition efficiency. According to tests, the efficiency of obtaining the loading amount of the absorbing device 10 in the embodiment of the present disclosure is at least 10 times higher than that in the related art.

[0251] The exemplary embodiments of the disclosed embodiments will be described in more detail below. Although the exemplary embodiments of the disclosed embodiments are described below, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Those who do not indicate specific techniques or conditions in the embodiments are carried out according to the techniques or conditions described in the literature in this area or according to the product specification. Those who do not indicate the manufacturer of the reagents or instruments used are all conventional products that can be obtained commercially.

[0252] Example 1

[0253] This embodiment 1 provides an electric wave reverberation chamber test system, which includes an absorbing module 1000, a test antenna 2000, a calibration antenna 6000 and a stirring module 7000 located in an electric wave reverberation chamber 4000, and a signal generation or analysis module 5000 located outside the electric wave reverberation chamber 4000. The absorbing module 1000 is located between the test antenna 2000 and the module to be tested 3000. Among them, the absorbing module 1000 includes a group of absorbing devices 100, and the absorbing device 100 includes six groups of coplanar absorbing groups 101 spaced apart in the vertical direction, which are supported by a support body 20, and each group of coplanar absorbing groups 101 includes six absorbing devices 10 spaced apart in the horizontal plane, wherein any three adjacent absorbing components constitute a minimum repeating unit, and the minimum repeating unit is in the shape of an equilateral triangle.

[0254] The distance between any two of the three absorbing devices 10 forming an equilateral triangle is equal to the entire wavelength of the electromagnetic wave at the highest test frequency; the minimum distance between the absorbing module 1000 and the test antenna 2000, the minimum distance between the absorbing module 1000 and the module to be tested 3000, and the minimum distance between the absorbing module 1000 and the calibration antenna 6000 are equal to half the wavelength of the electromagnetic wave at the lowest test frequency; the minimum distance between the absorbing module 1000 and any metal component is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency.

[0255] The absorbing device 10 includes: a container 11 and an absorbing material 12, wherein the absorbing material 12 is a sodium chloride solution with a mass concentration of 0.9%, the container 11 is made of high-density polyethylene, and the container body 111 of the container 11 is cylindrical. The support plate 21 of the support body 20 is also made of high-density polyethylene.

[0256] Comparative Example 1

[0257] The comparative example 1 provides an electric wave reverberation chamber test system. The structure of the electric wave reverberation chamber test system is basically the same as that of the embodiment 1, except that six groups of pyramidal absorbing materials 12 are used to replace the absorbing device 100 in the embodiment 1.

[0258] Test Case

[0259] This test example tests the field intensity suppression effect and measurement uncertainty of the radio wave reverberation chamber test system provided in Example 1 and Comparative Example 1. The test results are shown in Fig.17 and Table 1.

[0260] Table 1

[0261] project Demand value Example 1 Comparative Example 1 Field strength suppression value -7dB -7.99dB -7.57dB Measurement uncertainty 0.5dB 0.5dB 0.73-1.22dB time consuming / 2min More than 30 minutes

[0262] In Table 1, the “-” in the field strength suppression value refers to the amount of dB suppressed. Time consumption refers to the time used to determine the loading amount of the absorber, that is, the time to set up the test environment.

[0263] Depend on Fig.17 It can be seen that the radio wave reverberation chamber test system provided in Example 1 has a better field strength suppression effect and lower measurement uncertainty than the radio wave reverberation chamber test system provided in Comparative Example 1. It can be seen that the radio wave reverberation chamber test system provided in Example 1 has a stronger test accuracy.

[0264] This test example also tests the out-of-band spurious emission of the radio wave reverberation chamber test system provided in Example 1 and the radio wave reverberation chamber test system in the no-load state. The test results are shown in Fig.18 .in, Fig.18 The middle area P is the PIM3 impact area, which refers to the frequency band that can actually generate PIM3, thereby deteriorating the system noise floor / dynamic range.

[0265] The test results show that the radio wave reverberation chamber test system provided in Example 1 has a PIM suppression effect of 7dB-12dB compared with the radio wave reverberation chamber test system provided in Comparative Example 1, meeting the spurious test requirement of -43dBm / MHz.

[0266] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A wave absorbing device, It is characterized in that The wave absorbing device comprises: a container and a wave absorbing material contained in the container; The absorbing material comprises water and an ionic electrolyte, wherein the ionic electrolyte is dissolved in the water; The container is a non-metal container.

2. The wave absorbing device according to claim 1, It is characterized in that The ionic electrolyte includes at least one of sodium chloride, potassium chloride, sulfuric acid, phosphoric acid, sodium hydroxide and potassium hydroxide.

3. The wave absorbing device according to claim 1 or 2, It is characterized in that The mass concentration of the ionic electrolyte in the absorbing material is m, and m is less than the saturated precipitation concentration of the ionic electrolyte.

4. The wave absorbing device according to any one of claims 1 to 3, It is characterized in that The wave transmittance of the container to electromagnetic waves in a target frequency band is greater than or equal to 50%, and the target frequency band is 30 MHz to 70 GHz.

5. The wave absorbing device according to any one of claims 1 to 4, It is characterized in that The container comprises a container body, and the outline shape of the container body is a regular geometric shape.

6. The wave absorbing device according to claim 5, It is characterized in that The outline shape of the container body includes: spherical or cylindrical.

7. A wave absorbing device, It is characterized in that The wave absorbing device comprises: a support body, and one or more wave absorbing devices; The absorbing device is as described in any one of claims 1 to 6, and the absorbing device is supported by the supporting body.

8. The wave absorbing device according to claim 7, It is characterized in that The wave absorbing device comprises a coplanar wave absorbing group, and the coplanar wave absorbing group comprises a plurality of the wave absorbing components distributed at intervals.

9. The wave absorbing device according to claim 8, It is characterized in that There is at least one minimum repeating unit in the arrangement structure formed by the plurality of absorbing devices included in the coplanar absorbing group, and the minimum repeating unit is formed by the cooperation of at least two adjacent absorbing devices.

10. The wave absorbing device according to claim 9, It is characterized in that The geometric shape of the minimum repeating unit includes at least one of a regular polygon, a rhombus, and a rectangle.

11. The wave absorbing device according to claim 9 or 10, It is characterized in that There is at least one absorbing device shared by any two adjacent minimum repeating units.

12. The wave absorbing device according to any one of claims 8 to 11, It is characterized in that The wave absorbing device comprises a plurality of coplanar wave absorbing groups, wherein the plurality of coplanar wave absorbing groups are distributed at intervals along a target direction, and the target direction is perpendicular to the plane where the coplanar wave absorbing groups are located.

13. The wave absorbing device according to any one of claims 7 to 12, It is characterized in that The support has a wave transmittance greater than or equal to 50% for electromagnetic waves in a target frequency band, and the target frequency band is 30 MHz to 70 GHz.

14. The wave absorbing device according to any one of claims 7 to 13, It is characterized in that The support body is provided with one or more limiting structures, and the limiting structures are used to limit the absorbing device to the support body.

15. Use of the wave absorbing device according to any one of claims 1 to 6 or the wave absorbing device according to any one of claims 7 to 14 in reducing the field intensity in a shielding cavity.

16. An electric wave reverberation chamber test system, It is characterized in that The radio wave reverberation chamber test system comprises: an absorbing module and a test antenna, wherein the absorbing module comprises the absorbing device according to any one of claims 1 to 6 or the absorbing device according to any one of claims 7 to 14; The absorbing module and the test antenna are both located in the radio wave reverberation chamber, and the absorbing module, the test antenna and the module to be tested do not contact each other.

17. The radio wave reverberation chamber test system according to claim 16, It is characterized in that The absorbing module is located between the testing antenna and the module to be tested.

18. The radio wave reverberation chamber test system according to claim 17, It is characterized in that The radio wave reverberation chamber test system also includes: a signal generation or analysis module, a calibration antenna and a stirring module; The signal generating or analyzing module is located outside the radio wave reverberation chamber, and the signal generating or analyzing module is electrically connected to the test antenna; The calibration antenna and the stirring module are both located inside the radio wave reverberation chamber. The calibration antenna is electrically connected to the signal generation or analysis module during calibration operations. The stirring module is used to change the electromagnetic field distribution inside the radio wave reverberation chamber by stirring.

19. The radio wave reverberation chamber test system according to any one of claims 16 to 18, It is characterized in that The wave absorbing module comprises a coplanar wave absorbing group, and the coplanar wave absorbing group comprises a plurality of the wave absorbing devices distributed at intervals; The maximum spacing between any two adjacent absorbing devices is L1, which is less than or equal to the entire wavelength of the electromagnetic wave at the highest test frequency. The electromagnetic wave is an electromagnetic wave signal existing in the radio wave reverberation chamber during the test operation of the radio wave reverberation chamber test system.

20. The radio wave reverberation chamber test system according to any one of claims 16 to 19, It is characterized in that The minimum distance between the absorbing module and the test antenna is L21, and L21 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency; The minimum distance between the absorbing module and the module to be tested is L22, and L22 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency; The electromagnetic wave is an electromagnetic wave signal present in the radio wave reverberation chamber during the test operation of the radio wave reverberation chamber test system.

21. The radio wave reverberation chamber test system according to claim 20, It is characterized in that The radio wave reverberation chamber test system also includes: a calibration antenna, and the minimum distance between the wave absorbing module and the calibration antenna is L23, and L23 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency.

22. The radio wave reverberation chamber test system according to any one of claims 16 to 21, It is characterized in that The minimum distance between the absorbing module and any metal component is L3, and L3 is greater than or equal to half the wavelength of the electromagnetic wave at the lowest test frequency. The electromagnetic wave is the electromagnetic wave signal existing in the radio wave reverberation chamber during the test operation of the radio wave reverberation chamber test system.

23. A method for determining loading, It is characterized in that Used to determine the loading of the absorbing components in the radio reverberation chamber, including: Acquire a first field strength and a second field strength, wherein the first field strength is the field strength when the number of absorbing devices in the radio wave reverberation chamber is 0, and the second field strength is the field strength when the number of absorbing devices in the radio wave reverberation chamber is 1; According to the first field strength and the second field strength, respectively obtain a first equivalent absorption cross-sectional area and a second equivalent absorption cross-sectional area, wherein the first equivalent absorption cross-sectional area is an equivalent absorption cross-sectional area of ​​a single absorbing device in the radio wave reverberation chamber, and the second equivalent absorption cross-sectional area is an equivalent absorption cross-sectional area of ​​the absorbing device required under the target field strength; Determining a loading amount of the absorbing device according to the first equivalent absorption cross-sectional area and the second equivalent absorption cross-sectional area; The target field strength is the field strength requirement when performing testing operations in the radio wave reverberation chamber.

24. The method for determining loading amount according to claim 23, It is characterized in that The step of determining the loading amount of the absorbing device according to the first equivalent absorption cross-sectional area and the second equivalent absorption cross-sectional area comprises: The second equivalent absorption cross-sectional area is divided by the first equivalent absorption cross-sectional area, and the obtained value is used as the loading amount of the absorbing device.

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