CN102955092B - The antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment - Google Patents
The antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment Download PDFInfo
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- CN102955092B CN102955092B CN201210509123.9A CN201210509123A CN102955092B CN 102955092 B CN102955092 B CN 102955092B CN 201210509123 A CN201210509123 A CN 201210509123A CN 102955092 B CN102955092 B CN 102955092B
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Abstract
The present invention relates to the antenna arrangement method of the low frequency shield effectiveness test in a kind of shielding cavity separate space environment, it is characterized in that: cavity is divided into the first separate space and the second separate space by separate space wallboard by shielding cavity separate space environment, separate space wallboard is provided with separate space shield door, wallboard is provided with external shield door, emitting antenna is at the first separate space, receiving antenna is at the second separate space, emitting antenna and receiving antenna lay respectively at the both sides of separate space shield door, 11 test points are selected at separate space shield door periphery and center, emitting antenna electrical connection signal source, receiving antenna electrical connection receiver or spectrum analyzer, signal is sent to emitting antenna by signal source, by receiver or spectrum analyzer Received signal strength, respectively shield EMC measurement and reference measure are carried out to 11 test points.Advantage of the present invention is: counted shielding cavity separate space wall to the reflections affect of transmission antennas transmit field, improve the test accuracy of shielding construction and parts low frequency shield effectiveness in separate space environment.
Description
Technical field
The invention belongs to shield effectiveness technical field of measurement and test, propose the antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment especially.
Background technology
The shielding cavities such as screened room, shielding shelter are connected by conduction by six pieces of sheet metals, and electromagnetic wave is had to the sealed angular hexahedron cavity of good attenuation.Along with the screened room of separation, the widespread use of shielding cavities such as shielding shelter etc., the shield effectiveness of the shielding construction such as shield door, wave-guide intake on shielding cavity separate space wall and parts is tested and just seems increasingly important.Fig. 1 gives the shielding cavity schematic diagram with separate space, and wherein shield door includes the two class doors such as the shield door on the external shield door of shielding cavity and separate space wall.Due to structure and function reason, the shield door on typical separate space wall is generally positioned at certain side of separate space wall, thus makes the upper seam of shield door, lower seam, latasuture, respectively near the upper wall surface of two separate spaces, lower wall surface and side wall surface.And although the external shield door locus of shielding cavity is similar to the shield door on separate space wall, the upper seam of hatch door, lower seam, latasuture are only near the upper wall surface of a separate space, lower wall surface and side wall surface.
According to the requirement of the shield effectiveness testing standards such as GB12190, IEEE-299, MIL-STD-285, the measurement of shield effectiveness is a kind of relative measurement, be made up of reference measure (i.e. the calibration of unshielded spatial field) and shield EMC measurement two parts, the difference between shield EMC measurement value and reference measure value is tested shield shield effectiveness value.And when carrying out shield effectiveness data processing, for same test structure and parts, to get in all test points of same frequency minimum as shield effectiveness.
According to the requirement of testing standard, when low-frequency range is tested, need to adopt loop antenna to test to the test position (Fig. 2) on separate space shield door 3, found that the test point that every upper wall surface near separate space, lower wall surface and side wall surface are near, i.e. test point a, f, h, i, to be less than the magnetic field shielding usefulness in 300KHz frequency range all obviously on the low side compared with other test points, and adopt the shield effectiveness of the shielding cavity external shield door same test point of same assembling process, door higher than separate space shield door.
By obtaining this phenomenon analysis, when the shield effectiveness test carrying out this shielding cavity separate space shield door, there are following two features:
(1) tested position is positioned at the edge of separate space wallboard, and test position distance upper wall surface, lower wall surface and side wall surface is nearer;
(2) test of low-frequency magnetic shield effectiveness is all belonged to.
Obviously, under this state, the field that transmitting loop antenna produces is comparatively large by the impact of wallboard, belongs to and has boundary field.Test for this kind of shielding cavity shield effectiveness with separate space at present, corresponding standard does not specify concrete antenna arrangement method, all tests with reference to standards such as GB12190, IEEE-299, MIL-STD-285.And the reference measure of above-mentioned three prescribed by standard all adopts the measurement carrying out unshielded spatial field at approximate unbounded open area, be not suitable for the reference measure under boundary field environment.
Summary of the invention
The object of this invention is to provide the antenna arrangement method of the low frequency shield effectiveness test in a kind of shielding cavity separate space environment, to improve the method for testing of the prescribed by standard such as GB12190, IEEE-299, MIL-STD-285, thus the reference measure adapted under boundary field environment, obtain shield effectiveness accurately.
The present invention is achieved in that the antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment, it is characterized in that: cavity is divided into the first separate space and the second separate space by separate space wallboard by shielding cavity separate space environment, separate space wallboard is provided with separate space shield door, wallboard is provided with external shield door, emitting antenna is at the first separate space, receiving antenna is at the second separate space, emitting antenna and receiving antenna lay respectively at the both sides of separate space shield door, 11 test points are selected at separate space shield door periphery and center, emitting antenna electrical connection signal source, receiving antenna electrical connection receiver or spectrum analyzer, signal is sent to emitting antenna by signal source, by receiver or spectrum analyzer Received signal strength, respectively shield EMC measurement and reference measure are carried out to 11 test points.
Described separate space shield door periphery and central distribution 11 test points are respectively: the first test point, the second test point, the 3rd test point, the 4th test point, the 5th test point, the 6th test point, the 7th test point, the 8th test point, the 9th test point, the tenth test point, the 11 test point, first test point is position in upper wall surface distance, 11 test point is in separate space shield door center, and other arranges successively from the right side from the first test point.
Described emitting antenna and receiving antenna are when shield EMC measurement, emitting antenna and receiving antenna spacing are 60+ shield door thickness cm, lay respectively at separate space shield door both sides, and the antenna anchor ring of emitting antenna and receiving antenna is all perpendicular to the crack between a door and its frame between separate space shield door and separate space wallboard; Emitting antenna and receiving antenna detect respectively from the first test point of close upper wall surface, side wall surface, lower wall surface, the 6th test point, the 8th test point, the 9th test point point, signal source outputs signal to emitting antenna, and receiver/spectrum analyzer detects receiving antenna and tests field intensity at the signal of the first test point, the 6th test point, the 8th test point, the 9th test point point as the shielding of each point respectively.
Described emitting antenna and receiving antenna are when reference measure, emitting antenna and receiving antenna are arranged in the first separate space or the large separate space of the second separate space size, and two antenna distances are: 60+L, L=shield door thickness, the unit of 60+L is cm, and antenna anchor ring is all vertical and near separate space wallboard; Signal source outputs signal to emitting antenna, and receiver or spectrum analyzer detect the reference test field intensity of signal as the first test point, the 6th test point, the 8th test point, the 9th test point point of receiving antenna.
Advantage of the present invention is: counted shielding cavity separate space wall to the reflections affect of transmission antennas transmit field, improve the test accuracy of shielding construction and parts low frequency shield effectiveness in separate space environment.
Accompanying drawing explanation
Fig. 1 be the present invention the shield schematic diagram with separate space that is suitable for;
Fig. 2 is the test position schematic diagram of shield door shield effectiveness;
Fig. 3 is shield EMC measurement configuration schematic diagram of the present invention;
Fig. 4 is reference measure configuration schematic diagram of the present invention;
Fig. 5 is the schematic diagram of reference measure configuration mode 2;
Fig. 6 is the image theory schematic diagram of reference measure configuration mode 1;
Fig. 7 is the image theory schematic diagram of reference measure configuration mode 2.
In figure, the 1, first separate space; 2, the second separate space; 3, separate space shield door; 4, separate space wallboard; 5, wallboard; 6, external shield door; 7, upper wall surface; 8, side wall surface; 9, lower wall surface; 10, emitting antenna; 11, the emitting antenna magnetic line of force; 12, crack between a door and its frame; 13, receiving antenna; 14, the receiving antenna magnetic line of force; 15, image source; Z>0 region is that shielding cavity is inner in addition, is the region that test antenna is placed.
Note: a, the first test point; B, the second test point; C, the 3rd test point; D, the 4th test point; E, the 5th test point; F, the 6th test point; G, the 7th test point; H, the 8th test point; I, the 9th test point; J, the tenth test point; K, the 11 test point.
Embodiment
Embodiment 1
The antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment, it is characterized in that: cavity is divided into the first separate space 1 and the second separate space 2 by separate space wallboard 4 by shielding cavity separate space environment, separate space wallboard 4 is provided with separate space shield door 3, wallboard 5 is provided with external shield door 6, emitting antenna 10 is at the first separate space 1, receiving antenna 13 is at the second separate space 2, emitting antenna 10 and receiving antenna 13 lay respectively at the both sides of separate space shield door 3, 11 test points are selected at separate space shield door 3 periphery and center, emitting antenna 10 is electrically connected signal source, receiving antenna 13 is electrically connected receiver or spectrum analyzer, signal is sent to emitting antenna 10 by signal source, by receiver or spectrum analyzer Received signal strength, respectively shield EMC measurement and reference measure are carried out to 11 test points.
Embodiment 2
As shown in Figure 1, cavity is divided into the first separate space 1 and the second separate space 2 by separate space wallboard 4 by shielding cavity separate space environment, separate space wallboard 4 is provided with separate space shield door 3, wallboard 5 is provided with external shield door 6, emitting antenna 10 is at the first separate space 1, receiving antenna 13 is at the second separate space 2, emitting antenna 10 and receiving antenna 13 lay respectively at the both sides of separate space shield door 3, in separate space shield door 3 periphery and central distribution 11 test points, emitting antenna 10 is electrically connected signal source, and receiving antenna 13 is electrically connected receiver or spectrum analyzer.Send signal by signal source to emitting antenna 10, by receiver or spectrum analyzer Received signal strength, respectively shield EMC measurement and reference measure are carried out to 11 test points.
Separate space shield door 3 periphery and central distribution 11 test points are respectively: the first test point a, the second test point b, the 3rd test point c, the 4th test point d, the 5th test point e, the 6th test point f, the 7th test point g, the 8th test point h, the 9th test point i the tenth test point j, the 11 test point k, first test point a upper wall surface 7 apart from position, 11 test point k is in separate space shield door 3 center, and other arranges successively from the right side from the first test point a.Wherein, the first test point a, the 6th test point f, the 8th test point h, the 9th test point i are the test points making nearly upper wall surface 7, side wall surface 8, lower wall surface 9.
During shield EMC measurement, measure the method for arranging of antenna as shown in Figure 3, emitting antenna 10 and receiving antenna 13 lay respectively at separate space shield door 3 both sides, and the antenna anchor ring of emitting antenna 10 and receiving antenna 13 is all perpendicular to the crack between a door and its frame 12 between separate space shield door 3 and separate space wallboard 4; Emitting antenna 10 and receiving antenna 13 spacing are: 60+L, L is shield door thickness, the unit of 60+L is cm, emitting antenna 10 and receiving antenna 13 detect respectively from the first test point a, the 6th test point f of close upper wall surface 7, side wall surface 8, lower wall surface 9, the 8th test point h, the 9th test point i point, 7 signal sources output signal to emitting antenna 10, and receiver/spectrum analyzer detects receiving antenna 13 and tests field intensity at the signal of the first test point a, the 6th test point f, the 8th test point h, the 9th test point i point as the shielding of each point respectively.
During reference measure, measure the method for arranging of antenna as shown in Figure 4, emitting antenna 10 and receiving antenna 13 lay respectively at the first separate space 1 and the second separate space 2, be empty between first separate space 1 and the second separate space 2, take down separate space shield door 3, two antenna distances are: 60+L, L=shield door thickness, antenna anchor ring is all vertical and near upper wall surface 7, side wall surface 8, the wallboard of lower wall surface 9, signal source outputs signal to emitting antenna 10, receiver or spectrum analyzer detect the signal of receiving antenna 13 as the first test point a, 6th test point f, 8th test point h, the reference test field intensity of the 9th test point i point, upper wall surface 7, side wall surface 8, beyond lower wall surface 9, wallboard
Except other test points except the first test point a, the 6th test point f, the 8th test point h, the 9th test point i point, emitting antenna 10 and receiving antenna 13 lay respectively at the first separate space 1 and the test of the second separate space 2 shield effectiveness is all carried out with reference to standards such as GB12190, IEEE-299, MIL-STD-285.
For the feature of the method for arranging of the emitting antenna 10 and receiving antenna 13 of illustrating reference measure of the present invention, be described with the configuration mode of three kinds of reference measures below:
Configuration mode 1: launch, receiving antenna is placed in larger-size separate space, antenna anchor ring is all vertical and near separate space wallboard, as shown in Figure 4;
Configuration mode 2: launch, receiving antenna is placed in larger-size separate space, antenna anchor ring is all parallel and near separate space wallboard, as shown in Figure 5;
Configuration mode 3: transmitting, receiving antenna are placed in the outer open area of shielding cavity.
Wherein the unshielded spatial field of the approximate unbounded open area of the requirement such as configuration mode 3 i.e. GB12190, IEEE-299, MIL-STD-285 measures configuration mode.
From image theory, magnetic direction is parallel to the emissive source of wallboard, the magnetic direction of the image source of its correspondence is also parallel to wallboard, and direction is identical with emissive source; And for the emissive source of magnetic direction perpendicular to wallboard, the magnetic direction of the image source of its correspondence is also perpendicular to wallboard, and direction is contrary with emissive source.
Based on the configuration mode 1 of image theory and configuration mode 2 analytical model as shown in Figure 6, Figure 7, wherein L
0for the distance (standard-required is (60+L) cm, L is shield door thickness) between dual-mode antenna, h is the distance of crack between a door and its frame distance wall, and r is the distance of sending and receiving antenna distance wall, and image source is to the distance at receiving antenna place
Be operated in below 30MHz owing to measuring loop antenna used, wavelength is greater than 10m, so loop antenna can be considered electric small-size, can be equivalent to magnetic Hertz antenna; And in measurement frequency range, r, L
1all much smaller than λ 2 π, belong near field region.
The near region formula of magnetic field (θ=90) of magnetic Hertz antenna:
Wherein, I is the strength of current (A) of loop antenna, and S is the area (m of loop antenna
2), k is propagation constant.
(1) for configuration mode 1, as seen from Figure 6, the magnetic direction of active transmitting antenna is parallel to wall, and the magnetic field of image source is also parallel to wall, and both directions are identical.So the active field intensity (Z>0 region) propagating into receiving antenna place with image source is strengthened because mutually superposing:
Due under low frequency condition, kr ≈ 1, e
-jkr≈ 1, so formula (2) can abbreviation be:
(2) for configuration mode 2, as can be seen from Figure 7, the magnetic direction in original source (emitting antenna) is upwards perpendicular to wall, and the magnetic field of image source is downward vertically in wall, so the field intensity (Z>0 region) that original source and image source propagate into receiving antenna place weakens because cancelling out each other:
Due under low frequency condition, kr ≈ 1, e
-jkr≈ 1, so formula (4) can abbreviation be:
(3) for the outer open area free space calibration of the shielding cavity described in configuration mode 3, its analytical model can regard the radiation field of magnetic Hertz antenna at free space as.Owing to there is not the reflection that cavity wall causes, thus the putting position of antenna on test result without impact.
The field intensity at receiving antenna place is:
Contrast (3), (5), (6) can be found out, the magnetic field reference measurement values of configuration mode 1 is maximum; The magnetic field reference measurement values of configuration mode 3 is taken second place; Configuration mode 2 magnetic field reference measurement values is minimum.Therefore near the near test point of the upper wall surface of separate space, lower wall surface and side wall surface, namely test point a, f, h, i be less than in 300KHz frequency range carry out reference measure time, during according to configuration mode 2 and configuration mode 3, be starkly lower than the phenomenon of actual shield effectiveness with regard to there will be final shield effectiveness.Therefore during actual test, for test point a, f, h, i, adopt configuration mode 1 to carry out reference measure, other test points then adopt configuration mode 3 to carry out reference measure.
The parts that the present embodiment does not describe in detail and structure belong to the well-known components of the industry and common structure or conventional means, do not describe one by one here.
Claims (3)
1. the antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment, it is characterized in that: cavity is divided into the first separate space and the second separate space by separate space wallboard by shielding cavity separate space environment, separate space wallboard is provided with separate space shield door, wallboard is provided with external shield door, emitting antenna is at the first separate space, receiving antenna is at the second separate space, emitting antenna and receiving antenna lay respectively at the both sides of separate space shield door, 11 test points are selected at separate space shield door periphery and center, emitting antenna electrical connection signal source, receiving antenna electrical connection receiver or spectrum analyzer, signal is sent to emitting antenna by signal source, by receiver or spectrum analyzer Received signal strength, respectively shield EMC measurement and reference measure are carried out to 11 test points, described emitting antenna and receiving antenna are when shield EMC measurement, emitting antenna and receiving antenna spacing are 60+ shield door thickness, the unit of 60+ shield door thickness is cm, lay respectively at separate space shield door both sides, and the antenna anchor ring of emitting antenna and receiving antenna is all perpendicular to the crack between a door and its frame between separate space shield door and separate space wallboard, emitting antenna and receiving antenna detect respectively from the first test point of close upper wall surface, side wall surface, lower wall surface, the 6th test point, the 8th test point, the 9th test point, signal source outputs signal to emitting antenna, and receiver/spectrum analyzer detects receiving antenna and tests field intensity at the signal of the first test point, the 6th test point, the 8th test point, the 9th test point point as the shielding of each point respectively.
2. the antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment according to claim 1, it is characterized in that: described separate space shield door periphery and central distribution 11 test points respectively: the first test point, second test point, 3rd test point, 4th test point, 5th test point, 6th test point, 7th test point, 8th test point, 9th test point, tenth test point, 11 test point, first test point is position in upper wall surface distance, 11 test point is in separate space shield door center, other arranges successively clockwise from the first test point.
3. the antenna arrangement method of the low frequency shield effectiveness test in shielding cavity separate space environment according to claim 1, it is characterized in that: described emitting antenna and receiving antenna are when reference measure, emitting antenna and receiving antenna are arranged in the first separate space or the large separate space of the second separate space size, and two antenna distances are: 60+L, L=shield door thickness, the unit of 60+L is cm, and antenna anchor ring is all vertical and near separate space wallboard; Signal source outputs signal to emitting antenna, and receiver or spectrum analyzer detect the reference test field intensity of signal as the first test point, the 6th test point, the 8th test point, the 9th test point point of receiving antenna.
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| CN107589306A (en) * | 2016-07-07 | 2018-01-16 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment shielding performance testing device, system and method |
| CN110702999B (en) * | 2019-11-21 | 2022-03-01 | 中国工程物理研究院应用电子学研究所 | Strong electromagnetic pulse shielding effectiveness test system and method |
| CN114295900A (en) * | 2021-12-02 | 2022-04-08 | 中国人民解放军92728部队 | Method and system for measuring shielding effectiveness of electromagnetic shielding door |
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| US5990687A (en) * | 1997-05-29 | 1999-11-23 | Williams; Thomas H. | Measuring shield breaks in coaxial cable by a sheath test current |
| FR2887336A1 (en) * | 2005-06-20 | 2006-12-22 | Peugeot Citroen Automobiles Sa | Electromagnetic field shielding efficiency evaluating method for case to be tested, involves measuring signal received by receiving and transmitting antennas when absorbing unit and case are disposed at space in room, respectively |
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