CN108318758A - Super surface reverberation chamber - Google Patents
Super surface reverberation chamber Download PDFInfo
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- CN108318758A CN108318758A CN201810065523.2A CN201810065523A CN108318758A CN 108318758 A CN108318758 A CN 108318758A CN 201810065523 A CN201810065523 A CN 201810065523A CN 108318758 A CN108318758 A CN 108318758A
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- super surface
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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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
Abstract
The present invention proposes that a kind of novel super surface reverberation chamber, the reverberation chamber have the characteristics that reduce its lowest usable frequency, expand the indoor test space of reverberation and improve the indoor field uniformity of reverberation.Super surface cell used in the present invention has periodic structure property, compact dimensions, broadband, high efficiency, simple in structure, thinner thickness, easily combined with traditional devices, the series of advantages such as it is widely used, it is applicable in general reverberation chamber, improve field uniformity in reverberation chamber, expands the test space.
Description
Technical field
The invention belongs to Novel manual electromagnetic material field and the research fields of reverberation chamber, and in particular to pacify in reverberation chamber
A kind of super surface of ultra-thin ultra wide band random coded scattering formula is filled, realizes super surface reverberation chamber.
Background technology
Early in nineteen sixty-eight, Mendes H. A. professors Los Angeles West Electron exhibition with exchange just proposition in meeting
Trial by cavity resonator for the measurement of electromagnetic radiation, this is the theoretic blank of reverberation chamber.Then in 1970,
Reverberation chamber has just been used among the test to cable, connector and casing shield effectiveness by Jarva W..Reverberation chamber is only with it
Special advantage receives the attention of US military, has then issued 1377 standards of MIL- STD in 1971, and the standard is by its work
The fields such as the susceptibility test of electronic equipment, the anti-interference test of ordnance and transmitting test have been generalized to, reverberation chamber is become
Technological innovation of application.Then, the scholars such as Corona P. proposed in 1976 is used for reverberation chamber to there is consumption material
Absorption characteristic and the correlation method that measures of radiation of equipment emission characteristics.However totally apparently, in this initial ten or twenty
Nian Li is limited by computer function at that time and can not possibly be carried out to reverberation chamber progress fine modeling and to the field distribution in it big
The analysis of range high-precision calculates, so that reverberation chamber develops slowly, so that " reverberation chamber " this noun was 80 years 20th century
It is just proposed by National Bureau of Standards (NBS, National Bureau of Standards) first official for mid-term, and for the first time
An actual reverberation chamber is established, to the practical blank for the reverberation chamber that has been born.
Invention content
Technical problem：In order to effectively overcome during designing reverberation chamber, it is minimum available that realization reduces its as far as possible
Frequency expands the test space and improves the problem of the indoor field uniformity of reverberation, and the object of the present invention is to provide a kind of novel mixed
Room is rung, the super surface of ultra-thin ultra wide band random coded scattering formula is organically combined with reverberation chamber, enables it can be in the work frequency of ultra-wide
In band, realizing reduces lowest usable frequency, expands the indoor test space of reverberation, and improve its field uniformity.
The present invention specifically adopts the following technical scheme that：
A kind of super surface reverberation chamber, which is characterized in that be equipped on an at least metope in the reverberation chamber and at least one surpass surface, surpassed
Surface is parallel with the installation metope on the super surface, and by mechanical rotating shaft and wall connecting, using 0 ° -360 ° of super surface oneself
Agitation characteristics is realized by rotation.
Preferably, the super surface is circle.
Preferably, the super surface is that ultra-thin ultra wide band random coded scatters the super surface of formula.
Preferably, the super surface is identical by reflection amplitudes, two kinds of super surface cells of reflected phase phase difference of pi are according to heredity
The favorable combination that algorithm obtains rearranges, to realize the optimization in scattering direction.
The present invention also provides a kind of super surfaces, it is characterised in that two kinds identical by reflection amplitudes, reflected phase phase difference of pi
Super surface cell is rearranged according to the favorable combination that genetic algorithm obtains, metallic plate of the super surface cell by bottom, middle layer
Dielectric layer and top layer artificial surface electromagnetic structure composition, the cross section of the metallic plate of bottom and the dielectric layer of middle layer is just
It is rectangular；Artificial surface electromagnetic structure is made of wide metal structure line, including two V-type resonators, a cutting line resonance
Device and two V-type metal wire structures；Two V-type resonators are located on the same diagonal line of dielectric layer surface, and 45 ° of y-axis angle, and
It is symmetrical with dielectric layer surface central distribution, the opening of " V " font is opposite；Cutting line resonator is located at where V-type resonator diagonally
On line and it is attached between two V-type resonators；Two V-type metal wire structures are located on another diagonal line of dielectric layer surface, and
It is symmetrical with dielectric layer surface central distribution, the opening of " V " font is opposite；Wherein, the angle of V-type metal wire structure is 90 °, V-type
The angle of resonator is less than 180 °；The unilateral length of V-type metal wire structure is less than the unilateral length of the V-type resonator；Bottom
Metallic plate and artificial surface electromagnetic structure consistency of thickness.
Compared with prior art, the invention has the advantages that：
1. the present invention utilizes super surface ultra wide band characteristic, surface can be surpassed by one or more, and to cover reverberation as far as possible indoor
Wide working band.
2. the present invention using the scattering properties on super surface, enables it be rotated in reverberation indoor mechanical, realizes the characteristic of blender,
So as to improve the indoor field uniformity of reverberation.
3. the present invention is effectively expanded original using the ultra-slim features on super surface, device on the indoor wall of reverberation
The indoor test space of reverberation.
4. the present invention utilize the super surface resonance characteristic of itself, increase the indoor cavity modes number of former reverberation, enable its
More pattern counts are realized in lower resonant frequency, to reduce minimum available work frequency in former reverberation chamber.
5. the material in the present invention used in involved super surface is easy to process and is easily achieved.The super surface of the present invention is single
Member has periodic structure property, compact dimensions, broadband, high efficiency, simple in structure, and thinner thickness is widely used.
The present invention has the advantages that：
1. the present invention mainly proposes a kind of super surface reverberation chamber, by the ultra-thin ultra wide band random coded scattering super surface apparatus of formula mixed
It rings on indoor wall, and mechanical rotary device may be mounted at outside reverberation chamber, in the lowest usable frequency for improving reverberation chamber, expand
It solves critical problem in terms of the test space and field uniformity etc., to expand the application range of reverberation chamber, is
It has opened up a kind of new application prospect.
2. strong innovation, technology is perspective good：Super surface is organically combined with reverberation chamber, rotary super surface is improving
Strong innovation in terms of the characteristic of reverberation chamber, has no similar thought or method both at home and abroad；It can be very good to match with any reverberation chamber
It closes and uses, expanded the application range of reverberation chamber, have good technology perspective.
3. in terms of reverberation chamber characterisitic parameter, there is great improvement, ultra-thin ultra wide band scattering formula can make mechanical rotation
The lowest usable frequency of reverberation chamber can be effectively reduced, expands the indoor test space of reverberation and improve it uniformly by turning super surface
Property.
Description of the drawings：
Fig. 1 is the super surface cell structural perspective of embodiment one；
Fig. 2 is the super surface cell structure reflection amplitudes and reflected phase curve graph of embodiment one；
Fig. 3 is the super surface of entirety and its unit arrangement schematic diagram of embodiment two；
Fig. 4 is the super surface scattering field figure of entirety of embodiment two；
Fig. 5 is that whole super surface is cut into round schematic diagram by embodiment two；
Fig. 6 is the super surface scattering field figure of circle after the cutting of embodiment two；
Fig. 7 is the super apparent relevance charts for finned heat of circle after the cutting of embodiment two；
Fig. 8 is the super surface apparatus of circle after the cutting of embodiment two schematic diagram on a side wall in reverberation chamber；
Fig. 9 is the field uniformity curve graph of the test space in the reverberation chamber of embodiment two；
Specific embodiment：
The implementation of technical solution is described in further detail below in conjunction with the accompanying drawings：
Embodiment one
As shown in Figure 1, artificial surface electromagnetic structure of the super surface cell by the metallic plate of bottom, the dielectric layer of middle layer and top layer
The cross section of composition, the metallic plate of bottom and the dielectric layer of middle layer is square.Artificial surface electromagnetic structure is by wide gold
Belong to structure lines composition, including two V-type resonators, a cutting line resonator and two V-type metal wire structures.Two V-types are humorous
The device that shakes is located on the same diagonal line of dielectric layer surface（With 45 ° of y-axis angle）And it is symmetrical with dielectric layer surface central distribution, " V " word
The opening of type is opposite.Cutting line resonator is located at V-type resonator institute on the diagonal and is attached between two V-type resonators.
Two V-type metal wire structures are located on another diagonal line of dielectric layer surface（It is vertical with diagonal line where V-type resonator）And it is symmetrical
It is opposite in the opening of dielectric layer surface central distribution, " V " font.Wherein, the angle of V-type metal wire structure is 90 °, V-type resonance
The angle of device is less than 180 °.The unilateral length of V-type metal wire structure is less than the unilateral length of the V-type resonator.The gold of bottom
Belong to the consistency of thickness of plate and artificial surface electromagnetic structure.
This example select the super surface cell length of side bep=60 millimeters, in order to preferably realize the dispersion effect on super surface, root
According to embodiment one, above-mentioned 90 ° of super surface cell axial-rotation is obtained into the super surface cell of another kind that phase difference is π, is used respectively
Bits of coded " 0 " and " 1 " characterize.It is D that identical " 0 " or " 1 " unit, which are separately constituted dimension,（4×4）Hyperelement.Because of two
Phase difference between super surface cell is π, so the phase difference of the hyperelement of each composition is also π.Final super surface
Array by N gusts of the M row formed after " 0 " and " 1 " both hyperelement random alignments.Unless otherwise instructed, hereinafter
In " unit " mentioned indicate hyperelement.
It is theorized model using electromagnetic simulation software, as shown in Figure 1, the design parameter of structure is b=15.59 millimeter,w
=4 millimeters,l=43.64 millimeter, angleα=80 °,c=8.97 millimeters, angleβ=90 °,h=16 millimeters.Middle dielectric layer selects Luo Jie
This 5880, permittivity εr=2.2, loss angle tangent 0.0009.The thickness of all metal structures and underlying metal plate ist=
31 millimeters.Simulation calculation can be obtained cellular construction as shown in Figure 2 reflection amplitudes and reflected phase as a result, demonstrating two lists
The reflection amplitudes of member are identical, and reflected phase difference is π.
Explanation：Metal structure parameter selected by the present invention is not unique, can be changed by the physical size of modification structure
The reflected phase of unit, to realize the scattering application of other working frequency range.Such as change the metal structure size of unit, it can enable
It is applied in higher frequency range or its all band.
Embodiment two
In order to entirely can realize uniform diffusing scattering effect in its reflection space in super surface, first have to using optimization algorithm simultaneously
Determine the arrangement position of different reflected phase units.This example selects genetic algorithm, and is arranged 100 by " 0 " and " 1 " two kinds of units
Initial population of the array of randomly ordered composition as genetic algorithm, using array aerial direction figure function as fitness function,
Crossover operator intersects for single-point, crossover probability 90%, and mutation operator makes a variation for binary system, mutation probability 10%.It is counted to simplify
It calculates, used unit reflection amplitudes are 1V/m, therefore are updated to the relative reflection phase that the value in fitness function is only unit
0 and π of position.To realize preferable dispersion effect, the assessed value that fitness function is arranged is >=10dB, indicates to arrange when all units
In the case of being more than or equal to 10dB at the diffusing reflection field on super surface, the results are shown in Figure 3 for the arrangement position of output unit, and passes through
Simulation software obtains its scattered field figure（Such as Fig. 4）, it was demonstrated that the correctness and reliability of used optimization algorithm.
As shown in figure 5, by super entire surface cutting pattern after obtained optimization at circle（Circle can effectively be avoided to machinery
The interference of rotational structure, other shapes for meeting machinery rotation requirement can also）Afterwards, its scattered field figure is obtained by simulation software
(such as Fig. 6), after result explanation cuts global shape, super surface still has the uniform diffusing properties after optimization.It is to be obtained
Behind round super surface, for by itself and reverberation chamber combination, this example calculates the relative coefficient on the super surface, confirmed with this
Super surface has good stirring efficiency and agitation characteristics.As shown in fig. 7, during super surface is with machinery rotation is made,
Relative coefficient drops to 0.1 once suddenly, illustrates that super surface has very big irrelevance, and have good agitation characteristics.
According to actual needs, super arbitrary metope in reverberation chamber can be surface mounted in by multiple.The present embodiment passes through machinery
Shaft will one surpass the wall connecting on surface and any side wall in reverberation chamber（As shown in Figure 8）, super surface with install the super surface
The parallel attaching of metope, rotate freely realization agitation characteristics using 0 ° -360 ° of super surface.It is accurate according to the national military standard of reverberation chamber
Simulation parameter is set, sets the rotation stepping of super surface to 12 steps, 8 field intensity probes is established in simulation software, and apart from wall
At λ/4 of wall position, and after super surface blender rotates a circle, calculate field uniformity between the test section.If Fig. 9 makes, in figure
All field components be respectively less than standard requirement, illustrate super surface reverberation chamber have reduction lowest usable frequency, increase the test space and
Improve the effect of field uniformity.
Claims (8)
1. a kind of super surface reverberation chamber, which is characterized in that it is equipped on an at least metope in the reverberation chamber and at least one surpasses surface,
Super surface is parallel with the installation metope on the super surface, and by mechanical rotating shaft and wall connecting, utilizes 0 ° -360 ° of super surface
Rotate freely realization agitation characteristics.
2. super surface reverberation chamber as described in claim 1, which is characterized in that the super surface is circle.
3. super surface reverberation chamber as described in claim 1, which is characterized in that the super surface is ultra-thin ultra wide band random coded
The super surface of scattering formula.
4. super surface reverberation chamber as claimed in claim 3, which is characterized in that the super surface is identical by reflection amplitudes, reflects
Two kinds of super surface cells of phase by pi are rearranged according to the favorable combination that genetic algorithm obtains, to realize scattering direction
Optimization.
5. super surface reverberation chamber as claimed in claim 4, which is characterized in that described two super surface cells, one of which are super
Surface cell is formed by another super 90 ° of surface cell axial-rotation.
6. super surface reverberation chamber as claimed in claim 4, it is characterised in that described two super surface cells use bits of coded respectively
" 0 " and " 1 " characterizes.
7. super surface reverberation chamber as claimed in claim 4, it is characterised in that metallic plate of the super surface cell by bottom, middle layer
Dielectric layer and top layer artificial surface electromagnetic structure composition, the cross section of the metallic plate of bottom and the dielectric layer of middle layer is just
It is rectangular；Artificial surface electromagnetic structure is made of wide metal structure line, including two V-type resonators, a cutting line resonance
Device and two V-type metal wire structures；Two V-type resonators are located on the same diagonal line of dielectric layer surface, and 45 ° of y-axis angle, and
It is symmetrical with dielectric layer surface central distribution, the opening of " V " font is opposite；Cutting line resonator is located at where V-type resonator diagonally
On line and it is attached between two V-type resonators；Two V-type metal wire structures are located on another diagonal line of dielectric layer surface, and
It is symmetrical with dielectric layer surface central distribution, the opening of " V " font is opposite；Wherein, the angle of V-type metal wire structure is 90 °, V-type
The angle of resonator is less than 180 °；The unilateral length of V-type metal wire structure is less than the unilateral length of the V-type resonator；Bottom
Metallic plate and artificial surface electromagnetic structure consistency of thickness.
8. a kind of super surface, it is characterised in that two kinds of super surface cells identical by reflection amplitudes, reflected phase phase difference of pi are according to something lost
The favorable combination that propagation algorithm obtains rearranges, and super surface cell is by the metallic plate of bottom, the dielectric layer of middle layer and top layer
Artificial surface electromagnetic structure forms, and the cross section of the metallic plate of bottom and the dielectric layer of middle layer is square；Artificial surface electricity
Magnetic structure is made of wide metal structure line, including two V-type resonators, a cutting line resonator and two V-type metals
Cable architecture；Two V-type resonators are located on the same diagonal line of dielectric layer surface, and 45 ° of y-axis angle, and are symmetrical with dielectric layer table
The opening of face central distribution, " V " font is opposite；Cutting line resonator is located at V-type resonator institute on the diagonal and is attached at two
Between a V-type resonator；Two V-type metal wire structures are located on another diagonal line of dielectric layer surface, and are symmetrical with dielectric layer table
The opening of face central distribution, " V " font is opposite；Wherein, the angle of V-type metal wire structure is 90 °, and the angle of V-type resonator is small
In 180 °；The unilateral length of V-type metal wire structure is less than the unilateral length of the V-type resonator；The metallic plate of bottom and artificial
The consistency of thickness of surface electromagnetic structure.
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| CN201810065523.2A CN108318758A (en) | 2018-01-23 | 2018-01-23 | Super surface reverberation chamber |
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| CN201810065523.2A CN108318758A (en) | 2018-01-23 | 2018-01-23 | Super surface reverberation chamber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462168A (en) * | 2020-11-05 | 2021-03-09 | 西安交通大学 | Rapid air interface testing method based on electrically tunable wave-absorbing super surface |
| CN113163432A (en) * | 2021-03-25 | 2021-07-23 | 西安交通大学 | Method for rapidly calibrating coherent bandwidth of reverberation chamber by using electrically tunable wave-absorbing super surface |
| CN115566436A (en) * | 2022-11-10 | 2023-01-03 | 华南理工大学 | Super surface, array and system for improving RFID working environment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462168A (en) * | 2020-11-05 | 2021-03-09 | 西安交通大学 | Rapid air interface testing method based on electrically tunable wave-absorbing super surface |
| CN112462168B (en) * | 2020-11-05 | 2022-03-22 | 西安交通大学 | Rapid air interface testing method based on electrically tunable wave-absorbing super surface |
| CN113163432A (en) * | 2021-03-25 | 2021-07-23 | 西安交通大学 | Method for rapidly calibrating coherent bandwidth of reverberation chamber by using electrically tunable wave-absorbing super surface |
| CN115566436A (en) * | 2022-11-10 | 2023-01-03 | 华南理工大学 | Super surface, array and system for improving RFID working environment |
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