CN103743959A - Method for testing shielding effectiveness of irregular structure cavity in reverberation chamber based on frequency stirring technology - Google Patents
Method for testing shielding effectiveness of irregular structure cavity in reverberation chamber based on frequency stirring technology Download PDFInfo
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- CN103743959A CN103743959A CN201410036867.2A CN201410036867A CN103743959A CN 103743959 A CN103743959 A CN 103743959A CN 201410036867 A CN201410036867 A CN 201410036867A CN 103743959 A CN103743959 A CN 103743959A
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Abstract
The invention discloses a method for testing shielding effectiveness of an irregular structure cavity in a reverberation chamber based on a frequency stirring technology. The method comprises the steps of 1, building a testing platform; 2, calibrating a vector network analyzer; 3, setting parameters, testing and recording strength Si of a signal emitted by an electric field probe under each frequency point and strength Ri of a signal received by a receiving antenna, and calculating the difference between Si and Ri by utilizing the vector network analyzer; 4, removing the irregular structure cavity, testing and recording strength Si' of a signal emitted by the electric field probe under each frequency point and strength Ri' of a signal received by the receiving antenna again, and calculating the difference between Si' and Ri' at the moment; 5, calculating the shielding effectiveness. The method has the advantages that the testing speed is high, the quantity of needed testing equipment is small, the testing platform is easy to build, the electric field probe can be placed at any position in the irregular structure cavity, no mechanical stirrer or large-scale testing equipment needs to be arranged in the tested cavity, the method has no requirement on the size and the shape of the cavity space, and the testing result has good repeatability.
Description
Technical field
The present invention relates to a kind of cavity shield effectiveness method of testing based on frequency stirring technique, be particularly useful for the shield effectiveness test of irregular structure cavity in reverberation chamber.
Background technology
The external cavity of electronic equipment, when playing fixing, support, isolating exterior environment, protection electronic unit, also can intercept the inside and outside electromagnetic wave propagation of cavity, has certain screening ability.The test of China to cavity shield effectiveness, the shield effectiveness testing standards such as Main Basis GJB6785-2009, GJB5972-2006, GB/T12190-2006, the method for testing of these standard regulations mainly contains external radiation source method, built-in radiation source method and mechanical agitation type Reverberation room method.But as irregular structure cavitys such as tub, unmanned plane casings, state in the use when three kinds of method of testings are tested its shield effectiveness and have difficulties.
Such as when using the shield effectiveness of external radiation source method and built-in radiation source method test irregular structure cavity, it is inhomogeneous at the electromagnetic field of resonance band inside cavity, distributing, the different test results of antenna placement location can differ larger, cause the test result between different testers not have comparability.In order to solve cavity in resonance band internal electric field problem pockety, International Electrotechnical Commission has proposed mechanical agitation type reverberation chamber method of testing, by mechanical stirrer being installed in inside cavity, make inside cavity Electric Field Distribution reach spatial statistics even, to be placed on its test result of any position of inside cavity be all the same to test antenna like this.But for irregular structure cavity, if inside cavity narrow space just cannot be installed stirrer, can not use the test of mechanical agitation type Reverberation room method.
For this reason, need to propose one for irregular cavity shield effectiveness method of testing, reduce the requirement to inside cavity space, eliminate the impact of test position on result, meet the needs of all kinds irregular structure cavity shield effectiveness test.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of based on the space to inside cavity placement testing tool equipment of frequency stirring technique and the irregular structure cavity shield effectiveness method of testing of position no requirement (NR).
For addressing the above problem, the present invention adopts following technical scheme:
Step of the present invention is as follows:
Step 1, build test platform:
Place receiving antenna in inside, reverberation chamber perform region, place irregular structure cavity on the experiment table of reverberation chamber inside, place electric field probe optional position in described irregular structure cavity; Described electric field probe is connected with port 2 with the port one of vector network analyzer respectively with receiving antenna;
Step 2, calibration vector network analyzer:
During calibration, together with the cable that connects electric field probe and receiving antenna, calibrate, after calibration, described cable can not be changed, and can not change and walk line position; Once after replacing cable, need to recalibrate;
Step 3, parameters test:
Initial frequency, termination frequency and frequency points that vector network analyzer frequency sweep is set, the signal intensity S of electric field probe transmitting under each frequency is tested and recorded to described vector network analyzer
isignal intensity R with receiving antenna reception
i, the difference of trying to achieve both is denoted as D
i, D
i=D
i=
s
i-R
i 
;
Step 4, remove irregular structure cavity and again test:
Irregular structure cavity is moved down from experiment table, but do not shifted out reverberation chamber, expose former installation electric field probe therein, keep the position of electric field probe and the cabling invariant position of cable, utilize the vector network analyzer frequency sweep setting in step 3 initial frequency, stop frequency and frequency points, reuse vector network analyzer and test and record the signal intensity S that under each frequency now, electric field probe is launched
i' and receiving antenna receive signal intensity R
i', the difference of trying to achieve now both is denoted as D
i', D
i'=
s
i'-R
i'
;
Step 5, shield effectiveness calculate:
By the numerical value D obtaining for twice
iand D
i' subtract each other, obtain a series of and Frequency point difference one to one, centered by a certain Frequency point in above-mentioned a series of Frequency points, all differences of getting in its left and right equal frequencies bandwidth are asked its mean value, are denoted as the shield effectiveness of irregular structure cavity when this Frequency point.
The direction misalignment irregular cavity to be measured of described receiving antenna.
Described electric field probe is connected with port 2 with the port one of vector network analyzer by concentric cable respectively with receiving antenna.
In described step 5, in above-mentioned a series of Frequency points, centered by a certain Frequency point, obtain in 50MHz ~ 100MHz bandwidth and average after all frequencies, be denoted as the shield effectiveness of irregular structure cavity when this Frequency point.
Beneficial effect of the present invention is: (1) this method adopts reverberation chamber frequency stirring technique, has avoided, in irregular structure inside cavity, mechanical stirrer is installed, and has eliminated the requirement to the inside cavity test space; (2) electromagnetic environment of irregular structure inside cavity is that on theory significance, spatial statistics is uniform, so it is all the same that electric field probe is placed on its test result of any position in cavity, do not need electric field probe to be placed on to cavity center position as traditional method of testing, eliminated the requirement to testing tool equipment installation site; (3) electromagnetic environment of irregular structure inside cavity is that on theory significance, spatial statistics is uniform, so its test result reflection is multiple incidence direction, the combined action of various polarization mode electromagnetic wave to cavity, can more accurately reflect the screening ability that cavity provides in actual use; (4) testing apparatus of using is vector network analyzer, electric field probe, receiving antenna, concentric cable and reverberation chamber test site, and the testing apparatus of using is few, is easy to build test platform; (5) this method step is simple, is easy to realize, and test result is reproducible, and the different reverberation chamber place of different librarian uses is tested the result obtaining and had comparability, and cost is low, is convenient to promote, and market outlook are wide.
Accompanying drawing explanation
Accompanying drawing 1 is principle flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing 1 and embodiment, the present invention is further described:
The step of the present embodiment is as follows:
Step 1, build test platform:
Place receiving antenna in inside, reverberation chamber perform region, place irregular structure cavity on the experiment table of reverberation chamber inside, place electric field probe optional position in described irregular structure cavity; Described electric field probe is connected with port 2 with the port one of vector network analyzer respectively with receiving antenna;
Step 2, calibration vector network analyzer:
During calibration, together with the cable that connects electric field probe and receiving antenna, calibrate, after calibration, described cable can not be changed, and can not change and walk line position; Once after replacing cable, need to recalibrate;
Step 3, parameters test:
The initial frequency that vector network analyzer frequency sweep is set is that 90MHz, termination frequency are that 142MHz, frequency points are 27, and the signal intensity S of electric field probe transmitting under each frequency is tested and recorded to described vector network analyzer
isignal intensity R with antenna reception
i, the difference of trying to achieve both is denoted as D
i, D
i=
s
i-R
i 
;
Shown in following form 1:
Form 1
Step 4, remove irregular structure cavity and again test:
Irregular structure cavity is moved down from experiment table; but do not shifted out reverberation chamber; with the quality factor of guaranteeing reverberation chamber, do not change; expose former installation electric field probe therein; keep the position of electric field probe and the cabling invariant position of cable; utilize the vector network analyzer frequency sweep setting in step 3 initial frequency, stop frequency and frequency points, reuse vector network analyzer and test and record the signal intensity S that under each frequency now, electric field probe is launched
i' and the signal intensity R of antenna reception
i', the difference of trying to achieve now both is denoted as D
i', D
i'=
s
i'-R
i'
;
Shown in following form 2:
Form 2
Step 5, shield effectiveness calculate:
By the numerical value D obtaining for twice
iand D
i' subtract each other, obtain a series of and Frequency point difference one to one, shown in following form 3:
Form 3
Obtain take tested Frequency point 116MHz as tested frequency, calculate the mean value of all differences centered by it in 52MHz bandwidth, calculating the shield effectiveness of irregular structure cavity when 116MHz Frequency point is 50dB.
The direction misalignment irregular cavity to be measured of described receiving antenna.
Described electric field probe is connected with port 2 with the port one of vector network analyzer by concentric cable respectively with receiving antenna.
The present invention adopts reverberation chamber test platform, by vector network analyzer frequency sweep and the statistical average to follow-up data, make the electromagnetic field of irregular structure inside cavity form the uniform electromagnetic environment of spatial statistics on theory significance, eliminate the impact of test position on result.The electric field probe that test shield effectiveness adopts can be placed on tested inside cavity, also can be nested on tested cavity wall, has eliminated the requirement to tested inside cavity space size and shape.
Based on this kind of method equipment used, comprise reverberation chamber, vector network analyzer, receiving antenna and electric field probe.
Described reverberation chamber is mainly used in providing irregular structure cavity shield effectiveness test site, and it is the uniform electromagnetic environment of statistics that space distribution is provided.
Described vector network analyzer is mainly for generation of a broadband electromagnetic signal, and by the electric field probe being connected with port one, signal amplitude is shot out, by the receiving antenna being connected with port 2, receive wideband electromagnetic signal, the difference of the signal radiateing and the signal receiving, is D
i, remove after irregular structure cavity test again to the signal radiateing and the difference of the signal that receives, be D
i'; By D
iand D
i' between difference do statistical average, can obtain the shield effectiveness numerical value of irregular structure cavity.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of making within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection domain of the present invention.
Claims (4)
1. a method for irregular structure cavity shield effectiveness in the test reverberation chamber based on frequency stirring technique, is characterized in that, step is as follows:
Step 1, build test platform:
Place receiving antenna in inside, reverberation chamber perform region, place irregular structure cavity on the experiment table of reverberation chamber inside, place electric field probe optional position in described irregular structure cavity; Described electric field probe is connected with port 2 with the port one of vector network analyzer respectively with receiving antenna;
Step 2, calibration vector network analyzer:
During calibration, together with the cable that connects electric field probe and receiving antenna, calibrate, after calibration, described cable can not be changed, and can not change and walk line position; Once after replacing cable, need to recalibrate;
Step 3, parameters test:
Initial frequency, termination frequency and frequency points that vector network analyzer frequency sweep is set, the signal intensity S of electric field probe transmitting under each frequency is tested and recorded to described vector network analyzer
isignal intensity R with receiving antenna reception
i, the difference of trying to achieve both is denoted as D
i, D
i=
s
i-R
i ;
Step 4, remove irregular structure cavity and again test:
Irregular structure cavity is moved down from experiment table, but do not shifted out reverberation chamber, expose former installation electric field probe therein, keep the position of electric field probe and the cabling invariant position of cable, utilize the vector network analyzer frequency sweep setting in step 3 initial frequency, stop frequency and frequency points, reuse vector network analyzer and test and record the signal intensity S that under each frequency now, electric field probe is launched
i' and receiving antenna receive signal intensity R
i', the difference of trying to achieve now both is denoted as D
i', D
i'=
s
i'-R
i'
;
Step 5, shield effectiveness calculate:
By the numerical value D obtaining for twice
iand D
i' subtract each other, obtain a series of and Frequency point difference one to one, centered by a certain Frequency point in above-mentioned a series of Frequency points, all differences of getting in its left and right equal frequencies bandwidth are asked its mean value, are denoted as the shield effectiveness of irregular structure cavity when this Frequency point.
2. the method for irregular structure cavity shield effectiveness in the test reverberation chamber based on frequency stirring technique according to claim 1, is characterized in that: the direction misalignment irregular cavity to be measured of described receiving antenna.
3. the method for irregular structure cavity shield effectiveness in the test reverberation chamber based on frequency stirring technique according to claim 2, is characterized in that: described electric field probe is connected with port 2 with the port one of vector network analyzer by concentric cable respectively with receiving antenna.
4. the method for irregular structure cavity shield effectiveness in the test reverberation chamber based on frequency stirring technique according to claim 3, it is characterized in that: in described step 5, in above-mentioned a series of Frequency points centered by a certain Frequency point, obtain in 50MHz ~ 100MHz frequency bandwidth and average after all differences, be denoted as the shield effectiveness of irregular structure cavity when this Frequency point.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104297595A (en) * | 2014-10-16 | 2015-01-21 | 中国人民解放军军械工程学院 | Method for improving electronic equipment radiated susceptibility test repeatability in reverberation room constant stirring mode |
| CN105866743A (en) * | 2015-12-28 | 2016-08-17 | 中国人民解放军军械工程学院 | Radar clutter frequency spectrum characteristic simulation system based on reverberation chamber and method thereof |
| CN106597340A (en) * | 2016-12-09 | 2017-04-26 | 北京无线电计量测试研究所 | Electromagnetic field sensor calibration system based on reverberation room and method thereof |
| CN106940405A (en) * | 2017-03-24 | 2017-07-11 | 华北电力大学 | A kind of micro-wave screening takes shield effectiveness test system |
| CN114034950A (en) * | 2021-10-29 | 2022-02-11 | 西安空间无线电技术研究所 | System and method for testing electromagnetic leakage degree of aerospace passive product based on reverberation chamber |
| CN117347734A (en) * | 2023-10-08 | 2024-01-05 | 东南大学 | Method for selecting position of special-shaped shielding shell shielding effectiveness test antenna |
| CN117590090A (en) * | 2024-01-18 | 2024-02-23 | 中国计量科学研究院 | Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field |
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| CN106294998B (en) * | 2016-08-09 | 2019-09-17 | 中国计量科学研究院 | A kind of dimensionally-optimised method and device of electromagnetic reverberation room cavity |
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| CN104297595B (en) * | 2014-10-16 | 2015-12-30 | 中国人民解放军军械工程学院 | The method of electronic equipment radiated immunity test repeatability is improved under the continuous stir mode of reverberation chamber |
| CN105866743A (en) * | 2015-12-28 | 2016-08-17 | 中国人民解放军军械工程学院 | Radar clutter frequency spectrum characteristic simulation system based on reverberation chamber and method thereof |
| CN105866743B (en) * | 2015-12-28 | 2018-08-03 | 中国人民解放军军械工程学院 | Radar clutter spectral characteristic simulation system based on reverberation chamber and method |
| CN106597340A (en) * | 2016-12-09 | 2017-04-26 | 北京无线电计量测试研究所 | Electromagnetic field sensor calibration system based on reverberation room and method thereof |
| CN106597340B (en) * | 2016-12-09 | 2019-05-10 | 北京无线电计量测试研究所 | A kind of emf sensor calibration system and method based on reverberation chamber |
| CN106940405A (en) * | 2017-03-24 | 2017-07-11 | 华北电力大学 | A kind of micro-wave screening takes shield effectiveness test system |
| CN114034950A (en) * | 2021-10-29 | 2022-02-11 | 西安空间无线电技术研究所 | System and method for testing electromagnetic leakage degree of aerospace passive product based on reverberation chamber |
| CN114034950B (en) * | 2021-10-29 | 2024-05-14 | 西安空间无线电技术研究所 | System and method for testing electromagnetic leakage degree of spaceflight passive product based on reverberation room |
| CN117347734A (en) * | 2023-10-08 | 2024-01-05 | 东南大学 | Method for selecting position of special-shaped shielding shell shielding effectiveness test antenna |
| CN117590090A (en) * | 2024-01-18 | 2024-02-23 | 中国计量科学研究院 | Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field |
| CN117590090B (en) * | 2024-01-18 | 2024-04-02 | 中国计量科学研究院 | Device, method and equipment for quickly confirming uniformity of electromagnetic reverberation room field |
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