CN109164314B - Novel stirring mode electric wave reverberation chamber and reverberation method - Google Patents
Novel stirring mode electric wave reverberation chamber and reverberation method Download PDFInfo
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- CN109164314B CN109164314B CN201810878207.7A CN201810878207A CN109164314B CN 109164314 B CN109164314 B CN 109164314B CN 201810878207 A CN201810878207 A CN 201810878207A CN 109164314 B CN109164314 B CN 109164314B
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Abstract
The invention discloses a novel stirring mode electric wave reverberation chamber.A shell is in the shape of a regular triangular prism to form a cavity in the shape of the regular triangular prism; a trapezoidal reflector and an antenna for changing the position and the transmitting direction for multiple times to realize reverberation are also arranged in the cavity. The invention also discloses a novel mixing mode electric wave reverberation chamber reverberation method, wherein a trapezoidal reflector and an antenna are arranged in the cavity in the shape of the regular triangular prism, and the position and the transmitting direction of the antenna are changed for multiple times to realize reverberation. According to the invention, through the ingenious design of the cavity of the reverberation chamber, the surface reflection of the cavity and the reflection of the trapezoidal reflector in the cavity are fully utilized, and the change of the excitation source is combined, so that an electromagnetic field in the reverberation chamber forms a statistically uniform test environment, the lowest measurable frequency of the reverberation chamber is reduced to 675MHz, the number of sampling samples is reduced to 20, and a good optimization effect is achieved.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility and OTA (over the air) testing, in particular to a novel stirring mode electric wave reverberation chamber and a reverberation method.
Background
The electric wave reverberation room is a widely used EMC (Electro Magnetic Compatibility) and OTA (Over The Air interface testing technology) measuring device, forms a statistically uniform testing environment in The reverberation room through continuously changing boundary conditions, and has wide application prospect.
In terms of the mixing method, the reverberation chamber can be divided into a mechanical mixing reverberation chamber (MSRC), an electronic mixing reverberation chamber (EMSRC) and an Inherent Reverberation Chamber (IRC).
The mechanical stirring reverberation chamber changes the boundary condition of an electromagnetic field through the rotation of a mechanical stirrer, so that the standing wave mode of the electromagnetic field in a cavity is changed, and the electromagnetic field in a working area reaches a statistically uniform environment within one rotation of the stirrer. A statistically uniform environment needs to be established after one revolution of the stirrer, which means that the test time requires at least one revolution of the stirrer.
An electronic mixing reverberation chamber (EMSRC) is used to make the electromagnetic field in the cavity statistically uniform by changing the eigenfunctions. EMSRC includes two broad classes, source-mixing reverberation chamber (reverberation is achieved by changing the excitation source), frequency-mixing reverberation chamber (reverberation is achieved by changing the operating frequency).
The inherent reverberation chamber is a testing environment with uniform statistics formed by the electromagnetic field in the reverberation chamber by the ingenious design of the cavity of the reverberation chamber and the full utilization of the surface reflection of the cavity and the scattering body reflection in the cavity.
The mechanical stirring reverberation chamber is the most mature reverberation chamber applied and researched, and is the next to a source stirring reverberation chamber, a frequency stirring reverberation chamber and an inherent reverberation chamber.
In the reverberation chamber theory, the concept of the Lowest available Frequency (LUF) is defined. The reverberation chamber field uniformity is easily satisfied at higher frequencies because the higher the frequency, the larger the electrical size of the reverberation chamber, the larger the number of electromagnetic field modes inside the reverberation chamber, and the easier the field uniformity is satisfied. After defining the lowest available frequency, the frequency range above the LUF can be tested in a reverberation chamber. The working region of the reverberation chamber refers to a region satisfying a statistical uniformity condition inside the reverberation chamber in a frequency band above the lowest available frequency, which is generally represented by a rectangular shape, and IEC-61000 recommends that the working region is more than a quarter wavelength away from the walls of the reverberation chamber and the stirrer.
Reverberation chamber performance assessment generally has two basic indicators, namely the lowest available frequency and the number of samples sampled within a period. The lower the lowest available frequency, the fewer the number of samples sampled, and the better the performance of the reverberation chamber, given the measurement requirements. The prior art reverberation chambers are affected by their lowest available frequency size and the number of sampled samples, and are limited in measurable range and measurement speed. How to further optimize the performance of the reverberation chamber is a technical problem to be solved urgently.
Disclosure of Invention
The invention provides a novel stirring mode electric wave reverberation chamber and a reverberation method, which aim to solve the problems.
The technical scheme of the invention is as follows:
the invention provides a novel stirring mode electric wave reverberation chamber, wherein a shell is in the shape of a regular triangular prism to form a cavity in the shape of the regular triangular prism; a trapezoidal reflector and an antenna for changing the position and the transmitting direction for multiple times to realize reverberation are also arranged in the cavity.
Preferably, the side length of the regular triangle of the bottom surface of the regular triangular prism-shaped case is 1.6m, and the height of the regular triangular prism is 1.7659 m.
Preferably, the working area of the electric wave reverberation chamber is a cuboid;
a spatial rectangular coordinate system taking one end point of the regular triangular prism as an original point, a side edge as an X axis, a bottom edge as a Y axis and an axis parallel to the bottom surface as a Z axis is a reference coordinate system, the numeric area of the coordinate of the working area is (0.48295-1.28295, 0.6-1.0, 0.3-0.8), and the working volume is 0.16 cubic meter.
Preferably, the antenna is configured to move 0.2m in sequence along the positive Y-axis direction with the coordinate point (0.1446, 0.6, 0.2) as a first starting center position, to take 5 positions, and at each position, the antenna is rotated 90 degrees around the center, so that the transmitting direction of the antenna is also changed, resulting in 10 different antenna states;
the antenna is also used for sequentially moving 0.2m along the positive direction of the Y axis by taking a coordinate point which is in mirror symmetry with the first starting center position as a second starting center position, then taking 5 positions, and at each position, rotating the antenna by 90 degrees around the center to generate 11 th-20 th antenna states.
Preferably, the number of the trapezoidal reflectors is four, the four trapezoidal reflectors are arranged on the side surface of the shell and are uniformly and symmetrically distributed by taking the center of the side surface as a central point; the upper bottom surface of the trapezoidal reflector is a square with the side length of 0.05m, the lower bottom surface of the trapezoidal reflector is a square with the side length of 0.2m, the upper bottom surface is parallel to the lower bottom surface, and the height of the upper bottom surface is 0.15 m.
Preferably, the material of the housing is galvanized steel sheet, and the electrical conductivity σ of the galvanized steel sheet is 1.69 × 107S/m, relative magnetic permeability of mu r1, magnetic loss factor tan δμ＝0.0。
Preferably, the antenna is a half-wave dipole antenna.
The invention also provides a novel mixing mode electric wave reverberation chamber reverberation method, which comprises the following steps:
setting the shape of the shell of the electric wave reverberation chamber into a regular triangular prism to form a cavity in the shape of the regular triangular prism;
a trapezoidal reflector and an antenna are arranged in the cavity, and the position and the transmitting direction of the antenna are changed for multiple times to realize reverberation.
Preferably, the step of setting the shape of the enclosure of the electric wave reverberation chamber to a regular triangular prism includes setting a side length of a regular triangle of a bottom surface of the regular triangular prism shaped enclosure to 1.6m and setting a height of the regular triangular prism to 1.7659 m;
four trapezoidal reflectors are arranged on the side surface of the shell and are uniformly and symmetrically distributed by taking the center of the side surface as a central point; the upper bottom surface of the trapezoidal reflector is set to be a square with the side length of 0.05m, the lower bottom surface of the trapezoidal reflector is set to be a square with the side length of 0.2m, the upper bottom surface is parallel to the lower bottom surface, and the height of the upper bottom surface is 0.15 m.
Preferably, changing the position and the transmission direction of the antenna a plurality of times to achieve reverberation includes:
sequentially moving the antenna by 0.2m along the positive direction of the Y axis by taking a coordinate point (0.1446, 0.6 and 0.2) as a first starting center position, taking 5 positions, and rotating the antenna by 90 degrees around the center at each position so that the transmitting direction of the antenna is also changed, thereby generating 10 different antenna states;
and taking a coordinate point which is in mirror symmetry with the first starting center position as a second starting center position, sequentially moving the antenna by 0.2m along the positive direction of the Y axis, taking 5 positions, and rotating the antenna by 90 degrees around the center at each position to generate 11 th-20 th antenna states.
The invention discloses the technical effects that:
the invention utilizes the triangular prism special-shaped shell to form a cavity of a regular triangular prism, the trapezoidal scatterer is arranged in the cavity, the surface reflection of the cavity and the reflection of the trapezoidal scatterer in the cavity are fully utilized, the position and the emission direction of the antenna are changed to realize the change of the excitation source, the invention is a stirring mode which combines the inherent reverberation mode and the source stirring mode, and compared with the performance of some known mechanical stirring reverberation chambers, the invention has the advantages of better performance, simple structure, convenient operation and low cost. Experimental simulation shows that the lowest available frequency of the reverberation chamber is reduced from 800MHz to 675MHz by the design method, the number of periodic sampling samples is reduced from 36 to 20, the reduction of the lowest available frequency means the enlargement of a measurable range, and the reduction of the number of the periodic sampling samples means the improvement of a measuring speed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an embodiment of a novel mixing mode electric wave reverberation chamber of the present invention;
fig. 2 is a simulation result diagram of a novel mixing mode electric wave reverberation chamber according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, all the expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two identical names, non-identical entities or parameters, and are only for clarity of expression, and should not be construed as limiting the present invention.
Example one
The embodiment of the invention provides a novel stirring mode electric wave reverberation chamber.
Referring to fig. 1, a housing 1 of the electric wave reverberation chamber is shaped as a regular triangular prism, forming a cavity in the shape of a regular triangular prism; a trapezoidal reflector 2 and an antenna 3 are further arranged in the cavity, and reverberation is realized by changing the position and the transmitting direction (changing of an excitation source) of the antenna 3 for multiple times.
According to the electric wave reverberation chamber provided by the embodiment of the invention, the inherent reverberation chamber technology is combined with the source stirring reverberation technology, the regular triangular prism outer shell is arranged, the trapezoidal reflector 2 is arranged in the regular triangular prism outer shell, the excitation source is changed to realize reverberation, and compared with the known partial electric wave reverberation chamber, the performance is further optimized.
Example two
The second embodiment of the invention provides a better embodiment of a novel stirring mode electric wave reverberation chamber.
The bottom surface of the regular triangular prism is a regular triangle, the side length is 1.6m, the height of the regular triangular prism is 1.7659m, and the volume of the regular triangular prism is 1.9575 cubic meters.
The working area of the regular triangular prism is a cuboid, a space rectangular coordinate system which takes one end point of the regular triangular prism as an original point, the side edge of the regular triangular prism as an X axis, the bottom edge of the regular triangular prism as a Y axis and the axis parallel to the bottom surface as a Z axis is a reference coordinate system, the numeric area of the coordinate of the working area is (0.48295-1.28295, 0.6-1.0 and 0.3-0.8), namely, the numeric area of the X axis coordinate is (0.48295 and 1.28295), the numeric area of the Y axis coordinate is (0.6 and 1.0), the numeric area of the Z axis coordinate is (0.3 and 0.8), and the total working volume is 0.16 cubic meter.
In order to enrich the multipath reflection environment of the reverberation chamber, four trapezoidal reflectors are placed at the bottom of the reverberation chamber. The length of the upper bottom side of the trapezoidal reflector is 0.05 meter, the length of the lower bottom side of the trapezoidal reflector is 0.2m, the height of the trapezoid is 0.15m, and the 4 trapezoidal reflectors are symmetrically arranged at the front, the back, the left and the right. In the second embodiment of the invention, the regular triangular prism outer shell of the reverberation chamber is placed at an angle that the side surface is parallel to the horizontal plane, the bottom of the reverberation chamber is the position of the side surface in the cavity, and the four trapezoidal reflectors are placed on the side surface in the cavity, and are uniformly and symmetrically distributed by taking the central point of the side surface as the symmetric center.
Preferably, two baffles 4 are further arranged in the reverberation chamber, and the two baffles 4 are parallel to each other, perpendicular to the horizontal plane, and symmetrically distributed on two sides of the four trapezoidal reflectors.
In the embodiment of the present invention, the positions of the antennas and the changed paths are mirror images of each other about the central plane of the triangular prism (with the central plane parallel to the bottom surface). The first starting center position of the antenna is (0.1446, 0.6, 0.2), then the antenna moves 0.2m in turn along the positive direction of the Y axis, and 5 positions are taken, and in each position, the antenna rotates 90 degrees around the center, so that the transmitting direction of the antenna is changed. There would then be 10 different antenna states. Preferably, as an implementable way, the antenna is rotated by 90 ° on a plane parallel to the X axis, i.e. the plane on which the antenna is rotated is always kept parallel to the X axis.
The central plane parallel to the bottom surface of the regular triangular prism is taken as a symmetrical plane, a coordinate point mirror-symmetrical to the first starting center position is taken as a second starting center position of the antenna, the antenna is sequentially moved by 0.2m along the positive direction of the Y axis, and then 5 positions are taken, and at each position, the antenna is rotated by 90 degrees around the center (preferably, also rotated by 90 degrees along the plane parallel to the X axis), and 11 th to 20 th antenna states are generated. That is, at a certain viewing angle on the side of the vertical triangular prism, at each sample position on the left half of the center plane of the reverberation chamber, there is a symmetric antenna position on the right side of the center plane of the reverberation chamber, so that the antenna generates 20 excitation source states by changing the position and the transmission direction, that is, the reverberation chamber takes 20 samples.
Preferably, the housings of the reverberation chambers are made of galvanized steel sheet, which has an electrical conductivity of 1.69 × 107S/m, relative magnetic permeability of mu r1, magnetic loss factor tan δμ＝0.0。
Preferably, PEC materials are used for the trapezoidal diffuser surface to enhance reflection.
In addition, for convenient modeling, the transmitting antennas in the reverberation chamber all adopt half-wave dipole antennas.
In the second embodiment of the present invention, whether the field uniformity of the working region in the reverberation room meets the standard is determined by the standard deviation of the electric field intensity at the vertex of the rectangular working region. The specific determination method is as follows:
the first step is as follows: placing 8 electric field strength probes at the vertex of a rectangular working area, recording the maximum field strength received by the vertex of the working area after 10 times of position change and 10 times of emission direction change of an antenna, namely 20 times of sampling, and calculating a normalized electric field component, wherein the calculation formula is as follows:
wherein EMaxx,y,zIn the process of 20 times of sampling, the maximum field intensity P of three components of x, y and z received by 8 vertexes of a rectangular working areaInputIs the input power.
The second step is that: calculating the average value and the integral average value of the three direction normalization maximum field intensity values:
the third step: calculating the standard deviation:
a fourth step of: convert standard deviation to decibels (dB):
from the theoretical point of view of statistical electromagnetic field, the final standard deviation is the representation of the field uniformity in the working region of the reverberation chamber, and the smaller standard deviation indicates the more stable electromagnetic field environment in the working region. Meanwhile, the IEC 61000-4-21-2011 standard also gives recommendations for the standard deviation of the operating region of the reverberation chamber at different frequencies, as shown in the following table.
The simulation result of the field uniformity of the working area of the novel stirring mode electric wave reverberation chamber provided by the embodiment of the invention under different frequencies is as follows:
| model (model) | Frequency (MHz) | In the X direction | Y direction | In the Z direction | General direction |
| Triangular prism | 675 | 0.5783 | 2.4531 | 1.5556 | 1.6594 |
| |
700 | 2.1179 | 2.9662 | 1.8877 | 2.5831 |
| Triangular prism | 725 | 1.7050 | 1.1054 | 2.2280 | 1.9757 |
| Triangular prism | 750 | 1.1649 | 1.4623 | 1.5584 | 1.3747 |
| Triangular prism | 775 | 1.5552 | 1.5345 | 1.5563 | 2.7842 |
| |
800 | 3.4288 | 1.7823 | 3.0364 | 2.8478 |
| Triangular prism | 825 | 1.3998 | 2.6923 | 1.8451 | 2.0060 |
| Triangular prism | 850 | 0.6054 | 3.2878 | 1.4042 | 2.5072 |
| Triangular prism | 875 | 0.4646 | 1.8586 | 1.3503 | 1.7158 |
| |
900 | 1.8657 | 1.9018 | 0.9421 | 1.9868 |
The simulation chart is shown in FIG. 2, in which the horizontal axis represents frequency and the vertical axis represents standard deviation.
According to simulation results, except for 800MHz and 850MHz frequency points, the standard deviation of the field uniformity in the reverberation chamber is less than 3dB, and the standard requirements of IEC 61000-4-21 are met. In IEC-61000-4-21, the field uniformity of 3 frequency points above the lowest working frequency is allowed to be higher than 3dB, but the error is not more than 1 dB. The maximum standard deviation at 800MHz and 850MHz is 3.4288dB and 3.2878dB, and the error does not exceed 1dB, so the standard is considered to be met.
To explain the performance of the electric wave reverberation chamber provided in the embodiment of the present invention, another recently built reverberation chamber is introduced as a reference example.
The reverberation chamber for reference is a mechanical stirring reverberation chamber, the shell is a cuboid, the length, the width and the height are sequentially 1.5m by 0.9m by 1.45m, two stirrers are contained, and the angle of a stirrer blade is 60 degrees. The method is mainly used for antenna efficiency testing, OTA testing of active equipment and the like. In one working cycle, the main stirrer rotates 4 times, the auxiliary stirrer rotates 9 times, and 36 samples can be obtained in one cycle. The reverberation chamber has a volume of 1.9575 cubic meters, the working area is a cube, and the volume is 0.24 cubic meters. The specific positions of the working area are: the value range of X is (0.6,1.4), the value range of y is (0.15, 0.75), and the value orientation of Z is (0.3, 0.8). It is the reverberation chamber to be optimized, the lowest available frequency of which is 800MHz, and the number of samples sampled per cycle is 36.
The novel mixing mode electric wave reverberation chamber provided by the embodiment of the invention has the same volume as the rectangular parallelepiped mechanical mixing reverberation chamber for reference, and reduces the working area by one third relative to the mechanical mixing reverberation chamber, but according to the test experience, the reduction of the working area has little influence on the performance of the reverberation chamber. Compared with the mechanical stirring reverberation chamber, the novel stirring mode electric wave reverberation chamber provided by the embodiment of the invention reduces the lowest available frequency of the reverberation chamber from 800MHz to 675MHz, reduces the number of periodic sampling samples from 36 to 20, and improves the overall performance.
EXAMPLE III
The third embodiment of the invention provides a novel reverberation method of a stirring mode electric wave reverberation chamber, which comprises the following steps:
a stirrer is arranged in the cavity; setting the shape of the shell of the electric wave reverberation chamber into a regular triangular prism to form a cavity in the shape of the regular triangular prism; a trapezoidal reflector and an antenna are arranged in the cavity, and the position and the transmitting direction of the antenna are changed for multiple times to realize reverberation.
Preferably, the side length of the bottom surface of the regular triangular prism housing is set to 1.6m, and the height is set to 1.7659 m. Four trapezoidal reflectors are arranged on the side surface of the shell and are uniformly and symmetrically distributed by taking the center of the side surface as a central point; the upper bottom surface of the trapezoidal reflector is set to be a square with the side length of 0.05m, the lower bottom surface of the trapezoidal reflector is set to be a square with the side length of 0.2m, the upper bottom surface is parallel to the lower bottom surface, and the height of the upper bottom surface is 0.15 m.
For how to change the position and the transmitting direction of the antenna, please refer to embodiment two, which is not described herein.
The invention utilizes the triangular prism special-shaped shell, the scatterer utilizes the trapezoidal scatterer, and the performance of the original mechanical stirring reverberation chamber is optimized by combining the source stirring and stirring mode. The lowest available frequency of the reverberation chamber is reduced to 675MHz by adopting the design method, and the number of periodic sampling samples is reduced to 20. A decrease in the lowest available frequency means an increase in the measurable range, and a decrease in the number of periodic sampling samples means an increase in the measurement speed. Although the working volume is reduced by one third, according to the test, the reduced working area can satisfy most measurement requirements with less impact on the performance of the reverberation chamber. Therefore, the novel stirring mode electric wave reverberation chamber and the reverberation method provided by the invention are good optimization schemes.
Those skilled in the art will appreciate that the invention may be practiced without these specific details. The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A mixing-type electric wave reverberation chamber, characterized in that:
the shell is in the shape of a regular triangular prism to form a cavity in the shape of the regular triangular prism; the right triangular prism shell of the reverberation chamber is arranged at an angle that the side surface is parallel to the horizontal plane, and the bottom of the reverberation chamber is the position of the side surface in the cavity; a space rectangular coordinate system which takes one end point of the regular triangular prism as an original point, a side edge as an X axis, a bottom edge as a Y axis and an axis parallel to the bottom surface as a Z axis is taken as a reference coordinate system;
a trapezoidal reflector and an antenna for changing the position and the transmitting direction for multiple times to realize reverberation are also arranged in the cavity; the trapezoidal reflectors are placed on the inner side surface of the cavity and are uniformly and symmetrically distributed by taking the center point of the side surface as a symmetric center;
the antenna is used for sequentially moving 0.2m along the positive direction of a Y axis by taking a coordinate point (0.1446, 0.6 and 0.2) as a first starting center position, taking 5 positions, and rotating the antenna by 90 degrees around the center at each position so that the transmitting direction of the antenna is also changed to generate 10 different antenna states;
the antenna is also used for sequentially moving for 0.2m along the positive direction of the Y axis by taking a central plane parallel to the bottom surface of the regular triangular prism as a symmetrical plane and a coordinate point in mirror symmetry with the first starting central position as a second starting central position, and then taking 5 positions, and when at each position, the antenna rotates for 90 degrees around the center to generate 11 th-20 th antenna states.
2. The mixing type electric wave reverberation chamber of claim 1, wherein:
the side length of the regular triangle on the bottom surface of the regular triangular prism-shaped shell is 1.6m, and the height of the regular triangular prism is 1.7659 m.
3. The mixing type electric wave reverberation chamber of claim 2, wherein:
the working area of the electric wave reverberation chamber is a cuboid;
the value range of the coordinates of the working area is (0.48295-1.28295, 0.6-1.0 and 0.3-0.8), and the working volume is 0.16 cubic meter.
4. The mixing type electric wave reverberation chamber of claim 1, wherein:
the four trapezoidal reflectors are arranged on the side surface of the shell and are uniformly and symmetrically distributed by taking the center of the side surface as a central point;
the upper bottom surface of the trapezoidal reflector is a square with the side length of 0.05m, the lower bottom surface of the trapezoidal reflector is a square with the side length of 0.2m, the upper bottom surface is parallel to the lower bottom surface, and the height of the upper bottom surface is 0.15 m.
5. The mixing type electric wave reverberation chamber of claim 1, wherein:
the shell is made of galvanized steel sheet, and the conductivity sigma of the galvanized steel sheet is 1.69 multiplied by 107S/m, relative magnetic permeability of mur1, magnetic loss factor tan δμ＝0.0。
6. The mixing type electric wave reverberation chamber of any one of claims 1 to 5, wherein: the antenna is a half-wave dipole antenna.
7. A reverberation method of a mixing type electric wave reverberation chamber, comprising the steps of:
setting the shape of the shell of the electric wave reverberation chamber into a regular triangular prism to form a cavity in the shape of the regular triangular prism; the right triangular prism shell of the reverberation chamber is arranged at an angle that the side surface is parallel to the horizontal plane, and the bottom of the reverberation chamber is the position of the side surface in the cavity; a space rectangular coordinate system which takes one end point of the regular triangular prism as an original point, a side edge as an X axis, a bottom edge as a Y axis and an axis parallel to the bottom surface as a Z axis is taken as a reference coordinate system;
a trapezoidal reflector and an antenna are arranged in the cavity, and the position and the transmitting direction of the antenna are changed for multiple times to realize reverberation; the trapezoidal reflectors are placed on the inner side surface of the cavity and are uniformly and symmetrically distributed by taking the center point of the side surface as a symmetric center;
the step of changing the position and the transmission direction of the antenna a plurality of times to realize reverberation includes:
sequentially moving the antenna by 0.2m along the positive direction of the Y axis by taking a coordinate point (0.1446, 0.6, 0.2) as a first starting center position, taking 5 positions, and rotating the antenna by 90 degrees around the center at each position so that the transmitting direction of the antenna is also changed, thereby generating 10 different antenna states;
and taking a central plane parallel to the bottom surface of the regular triangular prism as a symmetrical plane and a coordinate point which is in mirror symmetry with the first initial central position as a second initial central position, sequentially moving the antenna by 0.2m along the positive direction of the Y axis, taking 5 positions, and rotating the antenna by 90 degrees around the center at each position to generate 11 th-20 th antenna states.
8. The reverberation method of the mixing type electric wave reverberation chamber of claim 7, wherein:
setting the shape of the shell of the electric wave reverberation room as a regular triangular prism, wherein the side length of a regular triangle on the bottom surface of the regular triangular prism-shaped shell is set to be 1.6m, and the height of the regular triangular prism is set to be 1.7659 m;
four trapezoidal reflectors are arranged on the side face of the shell and are uniformly and symmetrically distributed by taking the center of the side face as a central point; the upper bottom surface of the trapezoidal reflector is set to be a square with the side length of 0.05m, the lower bottom surface of the trapezoidal reflector is set to be a square with the side length of 0.2m, the upper bottom surface is parallel to the lower bottom surface, and the height of the upper bottom surface is 0.15 m.
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| KR100574226B1 (en) * | 2003-11-25 | 2006-04-26 | 한국전자통신연구원 | Method for measuring the electromagnetic radiation pattern and gain of a radiator using a TEM waveguide |
| CN103558422B (en) * | 2013-10-31 | 2016-06-08 | 陕西海泰电子有限责任公司 | A kind of mechanical agitation of electromagnetic reverberation room, source stirring mixed stirring device and method |
| CN106772177B (en) * | 2016-12-09 | 2019-05-17 | 北京无线电计量测试研究所 | A kind of emf sensor calibration system based on reverberation chamber and transmitting probe |
| CN108061836A (en) * | 2017-12-26 | 2018-05-22 | 北京中科国技信息系统有限公司 | Stir electromagnetism reverberation unit and its stirring means in source |
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