CN116859144A - Super-surface electric wave reverberation room and testing system - Google Patents
Super-surface electric wave reverberation room and testing system Download PDFInfo
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- CN116859144A CN116859144A CN202310697783.2A CN202310697783A CN116859144A CN 116859144 A CN116859144 A CN 116859144A CN 202310697783 A CN202310697783 A CN 202310697783A CN 116859144 A CN116859144 A CN 116859144A
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- 238000005259 measurement Methods 0.000 description 9
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a super-surface electric wave reverberation chamber and a testing system, wherein the super-surface electric wave reverberation chamber comprises a metal shielding cavity, and a plurality of rotatable super-surfaces are assembled on the inner wall of the metal shielding cavity and are used for realizing the stirring of an internal field of the super-surface electric wave reverberation chamber; and an electromagnetic signal transmitting antenna and an electromagnetic signal receiving antenna are arranged in the metal shielding cavity. The system for testing the super-surface electric wave reverberation chamber comprises a measuring system and a control system, wherein the measuring system comprises the super-surface electric wave reverberation chamber and the vector network tester, the control system comprises a control device and a plurality of rotary driving devices, and the rotary driving devices are used for driving the rotatable super-surfaces to rotate under the control of the control device. The invention is hopeful to be applied to the electromagnetic compatibility test of the electronic communication equipment, and realizes high-performance electromagnetic compatibility test equipment with miniaturization, low cost and high efficiency.
Description
Technical Field
The invention belongs to the field of artificial electromagnetic metamaterial and electromagnetic compatibility testing, and particularly relates to a super-surface electric wave reverberation room and a testing system.
Background
In 1968, h.a. Mendes proposed a reverberant room concept using cavity resonance for electromagnetic radiation measurement, after which Paolo corna, david c. Chang et al developed and perfected reverberant room electromagnetic measurement and analysis theory, and after the 90 th century, reverberant room technology became a hotspot for research in the field of electromagnetic compatibility. In 2003, the International Electrotechnical Commission (IEC) published and revised the standard of the IEC-61000-41-2 reverberation room test method, which has led to the development of a common facility for electromagnetic compatibility tests such as antenna radiation tests, absorption material measurements, etc.
The electromagnetic reverberation chamber is a shielding chamber formed by an electrically large and highly conductive reflective wall surface. One or more mechanical agitators are typically mounted in the chamber, and rotation of the agitators alters the boundary conditions of the chamber, thereby creating a statistically uniform, isotropic and randomly polarized electromagnetic environment within the chamber. Because of the characteristic that the electromagnetic field in the reverberation chamber is statistically uniform, the reverberation chamber has the following advantages: the high field intensity can be obtained by using relatively smaller input power in the reverberation chamber, and the method is suitable for carrying out high-field intensity radiation immunity test on an object to be tested; the highest working frequency is not limited; no wave absorbing material is required to be adhered, so that the cost is reduced and pollution caused by high-power radiation is reduced; the method can be applied to various electromagnetic compatibility tests such as radiation emission tests, shielding effectiveness tests and the like.
In the state of research at home and abroad of the electric wave reverberatory room, although the swinging wall, the corrugated wall, the stirring source and other reverberatory rooms can also realize the field or source stirring function, most commercial electric wave reverberatory rooms still adopt a mechanical stirrer, and in order to meet the international standard of field uniformity, the mechanical stirrer is complex in structure and huge in volume, so that an effective test space generally only occupies about 20% -30% of the space inside the reverberatory room, and the utilization rate of the space inside the reverberatory room is greatly reduced. Meanwhile, the mechanical stirring type electric wave reverberation room has the technical bottleneck that the stirring efficiency is low and the lowest available frequency is difficult to reduce. The research on the electromagnetic super surface at home and abroad is mainly focused on new concepts, new mechanisms and new applications, and most applications focus on the regulation and control of the propagation direction, amplitude, frequency, phase and polarization of electromagnetic waves in an open space, and are rarely used for regulating and controlling the electromagnetic waves in a closed environment such as a cavity. Therefore, how to introduce a new electromagnetic wave regulation mechanism to replace a mechanical stirrer in the reverberation room, effectively expand the test space under the condition of low cost, reduce the lowest available frequency and improve the stirring efficiency is a research hot spot and a difficult point in the field of reverberation rooms.
Disclosure of Invention
In order to solve the technical problems that the traditional mechanical stirring type electric wave reverberation chamber has low test space utilization rate and the lowest available frequency is difficult to reduce, the invention firstly provides an ultra-surface electric wave reverberation chamber which is characterized by comprising a metal shielding cavity, wherein a plurality of rotatable ultra-surfaces are assembled on the inner wall of the metal shielding cavity and are used for realizing the stirring of an inner field of the ultra-surface electric wave reverberation chamber; and an electromagnetic signal transmitting antenna and an electromagnetic signal receiving antenna are arranged in the metal shielding cavity.
The invention also provides a system for testing the super-surface electric wave reverberation chamber, which is characterized by comprising a measuring system and a control system, wherein the measuring system comprises the super-surface electric wave reverberation chamber and a vector network tester, the super-surface electric wave reverberation chamber comprises a metal shielding cavity, and a plurality of rotatable super-surfaces are assembled on the inner wall of the metal shielding cavity and are used for realizing the stirring of an internal field of the super-surface electric wave reverberation chamber; an electromagnetic signal transmitting antenna and an electromagnetic signal receiving antenna are arranged in the metal shielding cavity; the transmitting antenna is connected with a signal receiving port of the vector network tester, and the receiving antenna is connected with a signal transmitting port of the vector network tester; the control system comprises a control device and a plurality of rotary driving devices, wherein the rotary driving devices are used for driving the rotatable super-surfaces to rotate under the control of the control device.
Preferably, the rotatable super-surface is a reflective super-surface and is composed of a metal base plate and all-metal super-surface units arranged on the metal base plate according to a coding sequence.
Further preferably, the rotatable super-surface is composed of a metal base plate and two all-metal super-surface units which are arranged on the metal base plate according to the coding sequence, have the same reflection amplitude and have the reflection phase difference pi.
The invention has the beneficial effects that:
the super-surface electric wave reverberation chamber is a novel electric wave reverberation chamber formed by combining a super-surface technology with a traditional electric wave reverberation chamber, and compared with the traditional mechanical stirring electric wave reverberation chamber with the same size, the super-surface electric wave reverberation chamber can simultaneously realize lower available working frequency, larger effective test space and improve the reverberation performance of the electric wave reverberation chamber.
The super-surface electric wave reverberator provided by the invention adopts the rotatable super-surface to realize infield stirring, has the electromagnetic wave multi-angle scattering regulation and control capability, can reduce the resonance and the lowest working frequency of a reverberator cavity, and can improve the electromagnetic wave mode density in the reverberator cavity.
The super-surface electric wave reverberation chamber provided by the invention adopts the rotatable super-surface to realize in-field stirring, fully utilizes the characteristics of planarization and miniaturization of the super-surface, and can obviously improve the effective test space of the reverberation chamber compared with the traditional mechanical stirrer; meanwhile, the rotatable super surface can be well matched with any type of reverberation chamber cavity for use, and has high technical innovation and prospective.
The super-surface electric wave reverberation chamber provided by the invention adopts the rotatable super-surface to realize internal field stirring, and the whole super-surface structure is processed by all-metal materials, so that the super-surface electric wave reverberation chamber has extremely high degree of freedom and flexibility, can reduce the dielectric loss of the conventional metal-dielectric super-surface, ensures the high Q value and low loss in the super-surface electric wave reverberation chamber, and improves the stirring efficiency.
The invention can be applied to the electromagnetic compatibility test of the electronic communication equipment, can achieve the effects of miniaturization, low cost and high efficiency, and can form the capability of miniaturized high-performance electromagnetic compatibility test equipment.
The test system for the super-surface electric wave reverberation chamber provided by the invention consists of a control system and a measurement system, has the functions of measuring the super-surface reverberation chamber and evaluating performance parameters, and has the advantages of convenience in operation, high automation degree and the like in the aspects of solving the control, measurement and electromagnetic compatibility test of the super-surface reverberation chamber.
Drawings
FIG. 1 is a schematic diagram of a super surface wave reverberant room according to an embodiment of the present invention;
FIG. 2 is a schematic view of a rotatable subsurface structure in accordance with a first embodiment of the invention;
FIG. 3 is a diagram showing an example of a structure of a super surface unit according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a test system of a super surface electric wave reverberation chamber according to a second embodiment of the present invention;
FIG. 5 is a graph of reflection amplitude and reflection phase for a 0/1 cell of a rotatable subsurface in accordance with a third embodiment of the invention;
FIG. 6 is a graph showing the effect of uniform scattering of electromagnetic waves regulated by a rotatable subsurface;
FIG. 7 is a schematic view of a three rotatable subsurface assembly for an interior wall of a subsurface reverberatory chamber according to a third embodiment of the invention;
FIG. 8 is a graph of Q values of a subsurface wave reverberant room test in accordance with a third embodiment of the present invention;
FIG. 9 is a graph of angles associated with a test in a super surface wave reverberant room in accordance with a third embodiment of the present invention;
FIG. 10 is a graph of the lowest available frequencies for the indoor test of the super surface wave reverberations in the third embodiment of the present invention;
fig. 11 is a space diagram of an effective test for a super surface wave reverberant indoor test in accordance with a third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical scheme of the present invention, specific embodiments will be provided below with reference to the accompanying drawings. The specific embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the technical solution of the present invention.
Example 1
The embodiment provides a super-surface electric wave reverberation chamber, as shown in fig. 1, which comprises a metal shielding cavity 101, wherein a plurality of rotatable super-surfaces 102 are assembled on the inner wall of the metal shielding cavity 101, and the rotatable super-surfaces 102 can be controlled by a control system outside the metal shielding cavity 101 to rotate so as to realize the stirring of the electric field in the super-surface electric wave reverberation chamber. The metal shielding cavity 101 is provided with an electromagnetic signal transmitting antenna 103 and a receiving antenna 104 which can be electrically connected with a measuring system, an analyzing system and other systems outside the metal shielding cavity 101. The rotatable super surface 102 is in sealing connection with the control system, and the transmitting antenna 103 and the receiving antenna 104 are in sealing connection with the measuring system, the analyzing system and other systems, so that the metal shielding cavity 101 forms a sealed cavity. A plurality of rotatable super surfaces 102 can be assembled on six surfaces of the inner wall of the metal shielding cavity 101.
As shown in fig. 2, the rotatable super surface 102 of the present embodiment is a reflective super surface, and is composed of a metal base plate and all-metal super surface units arranged on the metal base plate according to a coding sequence. These rotatable subsurface 102 can be rotated by a control system outside the metal shielding cavity 101 for achieving uniform scattering of electromagnetic waves within the subsurface wave reverberant chamber.
Further, the rotatable super-surface 102 is composed of a metal base plate and two all-metal super-surface units which are arranged on the metal base plate according to the coding sequence and have the same reflection amplitude and have the reflection phase difference pi.
Illustratively, the metal base plate and the super surface unit may be made of an all-aluminum alloy material.
Illustratively, as shown in fig. 3, the above-mentioned super surface unit structure is a T-shaped structure, with a hollow rectangular block at the upper part and a connecting rod at the lower part. The connecting rod may be designed as a threaded bolt, by which the supersurface unit may be fastened to the metal base plate by arranging threaded holes in the metal base plate.
The super-surface electric wave reverberator adopts a rotatable super-surface to realize infield stirring, has the multi-angle scattering regulation and control capability of electromagnetic waves, can reduce resonance and minimum working frequency of a reverberator cavity, and can improve the electromagnetic wave mode density in the reverberator cavity; compared with the traditional mechanical stirrer, the ultra-surface planarization and miniaturization characteristics can be fully utilized, the effective test space of the reverberation chamber can be remarkably improved, and the ultra-surface planarization and miniaturization mechanical stirrer can be matched with any type of reverberation chamber cavity for use. The whole structure of the super surface is processed by all-metal materials, has extremely high degree of freedom and flexibility, can reduce the dielectric loss of the conventional metal-dielectric super surface, ensures the high Q value and low loss in the super surface electric wave reverberation chamber, and improves the stirring efficiency.
Example two
The embodiment provides a test system for a super-surface electric wave reverberation chamber, as shown in fig. 4, comprising a measurement system and a control system, wherein the measurement system comprises the super-surface electric wave reverberation chamber and the vector network tester of the first embodiment. The electromagnetic signal transmitting antenna in the metal shielding cavity of the super-surface electric wave reverberation chamber is connected with a signal receiving port (port 1 in the figure) of the vector network tester through an interface 1 arranged on the metal shielding cavity, and the receiving antenna is connected with a signal transmitting port (port 2 in the figure) of the vector network tester through an interface 2 arranged on the metal shielding cavity. The control system comprises a control device and a plurality of rotary driving devices, wherein the rotary driving devices are respectively and mechanically connected with the rotatable super-surfaces and used for driving the rotatable super-surfaces to rotate under the control of the control device so as to realize the stirring of the electric wave reverberation indoor field of the super-surfaces.
The control device may be a computer, for example. The rotary driving device comprises a stepping rotary motor and a motor driver, wherein the motor driver is connected with the computer, the stepping rotary motor is connected with the motor driver and the rotatable super-surface, and the motor driver is controlled by the computer to control the stepping rotary motor to drive the rotatable super-surface to rotate.
Specifically, the rotation angle, rotation period, and rotation speed may be input on a computer, which generates control commands and sends the control commands to the motor driver. For example, the motor driver may employ CL57D. The motor driver processes the received control command, sends a rotating command to the stepping rotating motor, the rotating shaft of the stepping rotating motor is connected with the rotatable super-surface, and responds to the rotating command to control the rotatable super-surface to rotate so as to realize the stirring of the super-surface electric wave reverberation indoor field. Through reasonable design, the indoor electromagnetic wave of the super-surface electric wave reverberation chamber can be uniformly scattered.
Example III
The embodiment provides a test system for a super-surface electric wave reverberation room, and provides an exemplary refinement scheme for the test system for the super-surface electric wave reverberation room of the second embodiment.
In this embodiment, the metal shielding cavity is 1200×800×1200× 1200mm made of all metal 3 One side of the rectangular cavity is provided with a switch door, four sides are provided with reserved windows for the stepping rotating motor, and the side of the cavity is provided with an interface for an antenna cable. Transmitting antennaThe receiving antennas are a pair of Vivaldi antennas with the working bandwidths of 0.1-20 GHz. In the test process, the transmitting antenna transmits electromagnetic waves, the computer controls the rotatable super-surface to rotate for field stirring, and the vector network analyzer measures the S parameters of the antenna.
In this embodiment, the rotatable super-surface is based on the principle of geometric phase, and is composed of a metal base plate and all-metal super-surface units arranged according to a coding sequence, and has the following three features: and a 0/1 super-surface unit made of all-metal materials, a reconfigurable rotary super-surface processing mode and a stepping rotary motor for controlling rotation.
Specifically, the rotatable super-surface is formed by arranging two super-surface units with the same reflection amplitude and pi different reflection phases on a metal base plate according to an optimized coding sequence. In order to facilitate the control of rotation, rotatable super surface finishes are made in circles of different sizes.
More specifically, the rotatable super surface design diameter 760mm is formed by assembling 120 super surface units and a round metal bottom plate, and the whole rotatable super surface design diameter is manufactured by processing an aluminum alloy material. The super surface units are arranged on the metal base plate at different rotation angles, representing two super surface units coded as 0/1. The two super-surface units are distributed through an optimized digital coding sequence, have the effect of regulating and controlling the uniform distribution of scattered waves, and realize the stirring of the super-surface reverberation indoor field.
As shown in fig. 3, the super surface unit structure is a T-shaped structure, and is composed of an upper hollow rectangular block and a lower connecting rod. The hollow rectangular block is hollow and has a size of 58×21×23mm 3 The thickness is 1mm, and the aluminum alloy is manufactured by bending 1050 series of aluminum alloy. The connecting rod is an aluminum alloy threaded bolt, the length is 25mm, the diameter is 5mm, and the threaded bolt is fixedly connected with the bottom surface of the hollow rectangular block by using a spot welding process. And an M5 threaded hole is tapped on the metal bottom plate, a threaded bolt is screwed into the threaded hole, and the back surface of the metal bottom plate is fixed by using an M5 hexagonal nut.
In the actual processing process, in order to facilitate the overall arrangement requirement, the metal bottom plate can be integrally manufactured into an aluminum alloy bottom plate with the diameter of 5mm, and M5 threaded holes are tapped at intervals of 60mm by processing 6050 series aluminum alloy materials; at the same time, a circle of 12 through holes with the diameter of 6mm is reserved in the middle of the bottom plateAnd is fixed with the stepping rotating motor. According to the principle of geometric phase, the hollow rectangular block of the super surface unit rotates by 0 o Or 90 o I.e. 0/1 unit of the encoded hypersurface.
The S parameter is solved by using an electromagnetic simulation software building model, and the reflection amplitude and the reflection phase of the super-surface 0/1 unit structure shown in figure 5 show that the designed super-surface unit has the characteristic of total reflection and the reflection phase difference is 180 at the low frequency range of 0.5-1.5 GHz o Phase gradient regulation scattered waves can be constructed.
It should be specifically noted that, the above embodiments are only examples, and the structural parameters of the super surface unit are not unique, and by adjusting each structural parameter of the unit, the reflection phase adjustment and control in other frequency bands can be realized, so that the method is applied to lower working frequency bands.
An example of a rotatable subsurface optimized coding sequence is given below, which is an optimized coding sequence obtained by a mathematical parsing method. The super-surface array factor is obtained through a plane aperture function and Fourier transformation, and solving of the super-surface array factor is simplified and equivalent to solving of an Erdos-Littlewood mathematical problem, so that an optimized coding sequence capable of regulating and controlling electromagnetic wave uniform scattering is obtained. The number of the super-surface units of the rotatable super-surface is 2 multiplied by 2, the coding sequence of the super-surface units is 10001100/01110011/01110011/01110011/10001100/10001100/01110011/01110011, 0/1 units are distributed according to the optimized coding sequence, and the result of regulating and controlling electromagnetic wave uniform scattering is obtained through simulation software and is shown in fig. 6.
It should be noted that the above-mentioned optimized coding sequence is not unique, and those skilled in the art can obtain other coding sequences with the effect of regulating and controlling the uniform scattering of electromagnetic waves by other optimizing methods, so as to realize the stirring characteristic.
Six inner walls of the super-surface electric wave reverberation chamber in the embodiment can be arbitrarily assembled with a plurality of rotary super-surfaces according to the requirements, and round super-surfaces with different sizes can be processed according to the sizes of the cavity walls. By way of example, three rotating super-surfaces are assembled as shown in FIG. 7, two circular rotatable super-surfaces 760mm in diameter and one circular rotatable super-surface 840mm in diameter are placed in the reverberation chamber 120, respectively0×800mm 2 Inner side of cavity wall and 1200X 1200mm 2 Inside the cavity wall.
According to the international standard IEC61000-4-21 for testing the electric wave reverberation chamber, various performance indexes of the super surface electric wave reverberation chamber are tested and measured, including Q value, effective test space, related angle and lowest available frequency. When the Q value is measured, the super surface is set to rotate and step by 6 degrees, the frequency of scanning is 200001, the transmitting antenna is arranged at one corner of the super surface electric wave reverberation room, and the receiving antenna is arranged at the center of the effective test space. The effective test space is set as a rectangular space 10cm away from the cavity wall or the rotatable super surface; setting a super-surface rotation step by 1 degree when measuring a related angle and the lowest available frequency, wherein the number of sweeps is 20001, and a transmitting antenna is arranged at one corner of a reverberation room; when the lowest available frequency is measured, the receiving antennas are placed at the eight vertices of the effective test space in X, Y and Z directions, respectively, and the lowest available frequency of each component field is measured.
The measurement results of the Q value, the related angle, the lowest available frequency and the effective test space of the super-surface electric wave reverberation chamber loaded with 1, 2 and 3 rotary super-surfaces are respectively shown in figures 8, 9, 10 and 11, and are compared with the performance indexes of the traditional mechanical stirring type reverberation chamber with the same cavity size.
According to the performance index measurement result of the super-surface electric wave reverberation chamber, the Q values of the super-surface electric wave reverberation chamber (loading 1, 2 and 3 super-surfaces) reach 10 within the range of 0.4-20GHz 3 ~10 4 The order of magnitude shows that the loss of the super-surface electric wave chamber is smaller, the high Q value is maintained, and the engineering application condition is met. The relative angles of the super surface reverberation chambers (loading 1, 2 and 3 super surfaces) are reduced by 6.93%, 16.99% and 18.00% respectively compared with the traditional mechanical stirring type reverberation chambers, which shows that the super surface electric wave reverberation chambers remarkably reduce the relative angles and improve the stirring efficiency. The lowest available frequency of the super surface reverberation chamber (loading 3 super surfaces) is reduced by 11.16% compared with the traditional mechanical stirring type reverberation chamber, and the technical bottleneck of the traditional reverberation chamber is broken through. The effective test space of the super surface reverberation chamber (loading 1, 2 and 3 super surfaces) is respectively improved by 143.91%, 99.23% and 79.31% compared with the traditional mechanical stirring type reverberation chamber, and the surface super surface electric wave reverberation chamber is obviousThe effective test space is improved, and the miniaturization requirement of the electromagnetic compatibility test system is met.
Compared with the traditional mechanical stirring type electric wave reverberation chamber with the same size, the super surface electric wave reverberation chamber of the embodiment can simultaneously realize lower available working frequency and larger effective test space; the device can achieve the effects of miniaturization, low cost and high efficiency, and can form the capability of miniaturized high-performance electromagnetic compatibility testing equipment.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
1. The super-surface electric wave reverberation chamber is characterized by comprising a metal shielding cavity, wherein a plurality of rotatable super-surfaces are assembled on the inner wall of the metal shielding cavity and are used for realizing the stirring of the inner field of the super-surface electric wave reverberation chamber; and an electromagnetic signal transmitting antenna and an electromagnetic signal receiving antenna are arranged in the metal shielding cavity.
2. The superficiality wave reverberatory chamber of claim 1, wherein the rotatable subsurface is a reflective subsurface, consisting of a metal base plate and all-metal subsurface units arranged in a coded sequence on the metal base plate.
3. The superficiality wave reverberatory chamber of claim 2, wherein the rotatable superficiality is composed of a metal base plate and two all-metal superficiality units of identical reflection amplitude and pi-phase difference arranged in a coded sequence on the metal base plate.
4. The system is characterized by comprising a measuring system and a control system, wherein the measuring system comprises an ultra-surface electric wave reverberation chamber and a vector network tester, the ultra-surface electric wave reverberation chamber comprises a metal shielding cavity, and a plurality of rotatable ultra-surfaces are assembled on the inner wall of the metal shielding cavity and are used for realizing the stirring of an internal field of the ultra-surface electric wave reverberation chamber; an electromagnetic signal transmitting antenna and an electromagnetic signal receiving antenna are arranged in the metal shielding cavity; the transmitting antenna is connected with a signal receiving port of the vector network tester, and the receiving antenna is connected with a signal transmitting port of the vector network tester; the control system comprises a control device and a plurality of rotary driving devices, wherein the rotary driving devices are used for driving the rotatable super-surfaces to rotate under the control of the control device.
5. The system for testing a super-surface radio wave reverberatory room of claim 4, wherein the rotatable super-surface is a reflective super-surface, consisting of a metal base plate and all-metal super-surface units arranged in a coded sequence on the metal base plate.
6. The system for testing a super-surface radio wave reverberator of claim 5, wherein the rotatable super-surface is composed of a metal base plate and two all-metal super-surface units which are arranged on the metal base plate in a coding sequence, have the same reflection amplitude and have different reflection phases pi.
7. The system of any one of claims 4-6, wherein the rotary drive means comprises a stepper rotary motor and a motor driver, the motor driver being coupled to the control means, the stepper rotary motor being coupled to the motor driver and the rotatable super surface.
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| CN202310697783.2A CN116859144A (en) | 2023-06-13 | 2023-06-13 | Super-surface electric wave reverberation room and testing system |
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| CN202310697783.2A CN116859144A (en) | 2023-06-13 | 2023-06-13 | Super-surface electric wave reverberation room and testing system |
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