CN105116249A - Broadband shielding effectiveness test device of small shielding chassis and method - Google Patents
Broadband shielding effectiveness test device of small shielding chassis and method Download PDFInfo
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- CN105116249A CN105116249A CN201510477422.2A CN201510477422A CN105116249A CN 105116249 A CN105116249 A CN 105116249A CN 201510477422 A CN201510477422 A CN 201510477422A CN 105116249 A CN105116249 A CN 105116249A
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Abstract
The invention relates to a broadband shielding effectiveness test device of a small shielding chassis and a method. The device at least comprises a small receiving antenna, a bidirectional radio frequency connector, a preamplifier, a signal source, a receiver and a coaxial shielding cable. The small receiving antenna is placed in the small shielding chassis. The small receiving antenna is connected to an external signal source via the bidirectional radio frequency connector through the coaxial shielding cable. A receiving antenna is successively conducted with the preamplifier and the receiver through the coaxial shielding cable, and a center of the small receiving antenna and the receiving antenna are in a center line. Directions of the small receiving antenna and the receiving antenna are the same and the small receiving antenna and the receiving antenna are parallel to each other. An outer edge distance is d+D, wherein the d is a distance between an emission antenna and a tested small shielding chassis test surface; and the D is a distance of the receiving antenna and the tested small shielding chassis test surface. The device and the method are suitable for the small shielding chassis whose single side length is less than 4U.
Description
Technical field
The invention belongs to electromangnetic spectrum field, particularly a kind of wide-band shield effectiveness proving installation of small-sized shielding case and method.
Background technology
Along with the development of electronic industry, electronic equipment miscellaneous is applied to more and more and is produced with life in recent years.The quantity of electronic equipment and the continuous increase of density, make its mutually between interference problem become more and more outstanding, in order to address this problem, nowadays shielding case is widely used the every aspect with all trades and professions and life.And simultaneously along with the raising of electronic industry manufacturing process and technology, the size of electronic equipment is also more and more less, and the thing followed is exactly the widespread use of the middle-size and small-size cabinet of shielding case.Even if but the overall dimensions of cabinet is reducing, but what cabinet self should possess does not functionally reduce along with reducing of cabinet integral size, as well-ventilated, be convenient to dismounting, also can be retained on small-sized machine box from these functional requirements such as outside observations.So no matter which kind of physical dimension small-sized machine box adopt, they all have some identical design features as hole, seam, vent window, view window etc.Such design feature can produce certain impact to the shield effectiveness of cabinet, and the weakest link of shielding case also often appears at these positions of cabinet, and the electromagnetic leakage amount of these positions also merits attention most.
The shield effectiveness of small-sized shielding case becomes the important indicator weighing small-sized shielding case performance quality.But the shield effectiveness how measuring small-sized machine box is but very difficult.The national standard of nowadays conventional measurement shield effectiveness has: the measuring method of GB/T12190-2006 electromagnetic shielding chamber shield effectiveness, GJB6785-2009 Military Electronic Equipment shelter shield effectiveness method of testing, GJB5240-2004 Military Electronic Equipment Universal machine cabinet rack shield effectiveness require and method of testing.Above three standards all have requirement to casing structure size, wherein GB/T12190-2006 requires that each limit size must not be less than 2000mm, GJB6785-2009 requires that each limit size must not be less than 1800mm, and GJB5240-2004 requires that each limit size should not be less than 177mm (4U).As from the foregoing, in a standard certain limit size is less than to the cabinet of 4U, does not then have corresponding method of testing to go to measure its shield effectiveness.This is because the antenna measured in standard used by test specimen shield effectiveness is receiving antenna, biconical antenna, dipole antenna, electromagnetic horn, what wherein size was minimum is spherical dipole antenna, and its diameter is 100mm.With 2U machine box for server conventional in electronics industry, the thickness of 2U cabinet only has 88.9mm, and antennas all in standard all cannot be positioned in the too small small-sized shielding case of this single side size.
Summary of the invention
The object of this invention is to provide a kind of the wide-band shield effectiveness proving installation and the method that adapt to the small-sized shielding case of small-sized shielding case shield effectiveness test.
The present invention is achieved in that a kind of wide-band shield effectiveness proving installation of small-sized shielding case, it is characterized in that: at least comprise little receiving antenna, bi-directional RF connector, prime amplifier, signal source, receiver, coaxial shielding cable, it is inner that described little receiving antenna is positioned over small-sized shielding case, and little receiving antenna is connected with the signal source of outside through bi-directional RF connector by coaxial shielding cable; Receiving antenna by coaxial shielding cable successively with prime amplifier and receiver conducting, and the center of little receiving antenna and receiving antenna are on a center line, little receiving antenna is identical with receiving antenna direction, be parallel to each other, outer distance is d+D, d is the distance of emitting antenna and tested small-sized shielding case test surfaces, and D is the distance of receiving antenna and tested small-sized shielding case test surfaces.
Described small-sized shielding case is the shielding case that the size on a wherein limit is less than 4U.
Described little receiving antenna has 2 kinds, is respectively Φ 60mm and Φ 30mm, is to overlap one end isocentric circular arc of welding and forming by the inner wire of RF cable with external loop layer, and its essence is emitting antenna; The frequency range that wherein the little receiving antenna of Φ 60mm is corresponding is 9kHz ~ 1GHz; The frequency range that the little receiving antenna of Φ 30mm is corresponding is 1GHz ~ 3GHz.
Described bi-directional RF connector is bidirectional metal shield electric-connector, has metal flange in the middle part of it, realizes being connected with the fixing compact of tested small-sized shielding case body and semi-anechoic chamber wall by ring flange.
The signal power amplified frequency band of described prime amplifier is 9kHz to 3GHz.
Described signal source is function signal generator or modulation signal generator or broadband signal source.
Described receiver is frequency spectrograph.
Described coaxial shielded cable is the coaxial cable meeting 9kHz to 3GHz frequency range.
A wide-band shield effectiveness method of testing for small-sized shielding case, is characterized in that: at least comprise:
Step 101, measure straight-through reception value: signal source sends signal, bi-directional RF connector is passed by signal transmission to little receiving antenna by coaxial shielded cable, launched by little receiving antenna, received by reception receiving antenna again, the signal received is passed to receiver by prime amplifier via bi-directional RF connector, the antenna horizontal polarization that receiver obtains and the data of vertical polarization;
Step 102, measures shielding reception value: little receiving antenna is placed in tested small-sized shielding case inner, the tested surface of tested small-sized shielding case is aimed at its center, and the distance of the tested surface of little receiving antenna and tested small-sized shielding case is d; The wall of tested small-sized shielding case installs bi-directional RF connector, by little receiving antenna by the bi-directional RF connector on tested small-sized shielding case wall and the bi-directional RF connector on semi-anechoic chamber wall, is connected with signal source;
Receive receiving antenna and be positioned at tested small-sized shielding case outside, and the tested surface of tested small-sized shielding case is aimed at the center receiving receiving antenna, the distance received between receiving antenna and the tested surface of tested small-sized shielding case is D; Receive receiving antenna to be connected with signal preamplifier by coaxial shielding cable, be then connected with the receiver outside darkroom by the shielded connector on semi-anechoic chamber wall;
Step 103, calculates shield effectiveness: use the straight-through reception value obtained in step 1 to deduct the shielding reception value obtained in step 2, can draw the shield effectiveness of small-sized shielding case receiving plane after calculating:
SE＝A
1-A
2(1)
Wherein SE is shield effectiveness;
A
1for straight-through reception is worth;
A
2for shielding reception value;
Step 104, determine to reveal position: instrument is connected according to method shown in step 102, receiving antenna is replaced with little receiving antenna, by the weak link such as each hole, seam, vent window of near field probes near small-sized shielding case, and observe the reading of receiver at any time, reading value is larger, and the leakage rate representing this place is larger, is the weak link of shielding case.
Beneficial effect of the present invention: be the shield effectiveness test problem solving small-sized shielding case.Due in the antenna that GB/T12190-2006, GJB6785-2009, GJB5240-2004 tri-is used in standard, what size was minimum also has 100mm.Therefore the present invention proposes to use in little receiving antenna replacement standard and be positioned over the antenna of cabinet inside to carry out the method for shield effectiveness measurement, simultaneously with reference to the method measuring shield effectiveness in GB/T12190-2006, GJB6785-2009, GJB5240-2004, and then propose a set of survey instrument and the measuring method that are specifically designed to the measurement of small-sized shielding case shield effectiveness.
Feature of the present invention is: be applicable to the small-sized shielding case that the monolateral length of side is less than 4U; Emitting antenna is interior, and receiving antenna outside, can while maintenance transmission antennas transmit signal, moves receiving antenna thus finds out the shielding weak link of tested shielding case.
Accompanying drawing explanation
The straight-through test schematic diagram of Figure 19 kHz to 30MHz magnetic field frequency range;
The shield effectiveness of Figure 29 kHz to 30MHz magnetic field frequency range detects schematic layout pattern;
The straight-through test schematic diagram of Figure 31 00MHz to 1GHz electric field frequency range;
The shield effectiveness of Figure 41 00MHz to 1GHz electric field frequency range detects schematic layout pattern;
The straight-through test schematic diagram of Figure 51 GHz to 3GHz plane wave frequency range;
The shield effectiveness of Figure 61 GHz to 3GHz plane wave frequency range detects schematic layout pattern.
In figure: 1, little receiving antenna; 2, receiving antenna; 3, signal source; 4, prime amplifier; 5, receiver; 6, coaxial shielding cable; 7, doublet antenna; 8, electromagnetic horn; 9, bi-directional RF connector; 10, tested small-sized shielding case; 11, semi-anechoic chamber; The distance of d, emitting antenna and tested small-sized shielding case test surfaces; The distance of D, receiving antenna and tested small-sized shielding case test surfaces.
Embodiment
Embodiment 1 (measurement of 9kHz ~ 30MHz frequency range)
As shown in Figure 1 and Figure 2, a kind of wide-band shield effectiveness proving installation of small-sized shielding case, it is characterized in that: at least comprise little receiving antenna 1, bi-directional RF connector 9, prime amplifier 4, signal source 3, receiver 5, coaxial shielding cable 6, little receiving antenna 1 is connected with the signal source 3 of outside through bi-directional RF connector 9 by coaxial shielding cable 6; Receiving antenna 2 by coaxial shielding cable 6 successively with prime amplifier 4 and receiver 5 conducting, and the center of little receiving antenna 1 and receiving antenna 2 are on a center line, little receiving antenna 1 is identical with receiving antenna 2 direction, be parallel to each other, outer distance is d+D, d is the distance of emitting antenna and tested small-sized shielding case test surfaces, and D is the distance of receiving antenna and tested small-sized shielding case test surfaces.
It is inner that described little receiving antenna 1 is positioned over small-sized shielding case 10.
Described small-sized shielding case 10 is shielding cases that the size on a wherein limit is less than 4U.
Described little receiving antenna 1 has 2 kinds, is respectively Φ 60mm and Φ 30mm, is to overlap one end isocentric circular arc of welding and forming by the inner wire of RF cable with external loop layer, and its essence is emitting antenna; The frequency range that wherein the little receiving antenna of Φ 60mm is corresponding is 9kHz ~ 1GHz; The frequency range that the little receiving antenna of Φ 30mm is corresponding is 1GHz ~ 3GHz.
Described bi-directional RF connector is bidirectional metal shield electric-connector, has metal flange in the middle part of it, realizes being connected with the fixing compact of tested small-sized shielding case body and semi-anechoic chamber 11 wall by ring flange.
The signal power amplified frequency band of described prime amplifier is 9kHz to 3GHz.
Described signal source is function signal generator, modulation signal generator or broadband signal source.
Described receiver is frequency spectrograph.
Described coaxial shielded cable is the coaxial cable meeting 9kHz to 3GHz frequency range.
Described absorbing material is magnetic loss type absorbing material.
Due in this method, emitting antenna is positioned at the outside that the inner and receiving antenna of shielding case is positioned at shielding case, transmitting that receiving antenna can receive is more weak, therefore when measuring the shield effectiveness of small-sized shielding case, should signal source and receiver be placed in outside semi-anechoic chamber, and all the other equipment are placed in semi-anechoic chamber, avoid ambient signal and the result of equipment self-noise signal to test to have an impact.
The method of testing of this small-sized shielding case is carried out according to following step:
Step 101, measure straight-through reception value: signal source 3 sends signal, bi-directional RF connector 9 is passed by signal transmission to little receiving antenna 1 by coaxial shielded cable 6, launched by little receiving antenna 1, received by reception receiving antenna 2 again, the signal received is passed to receiver 5 by prime amplifier 4 via bi-directional RF connector 9, and the antenna horizontal polarization that receiver 5 obtains and the data of vertical polarization, be straight-through reception value;
Step 102, measure shielding reception value: little receiving antenna 1 is placed in tested small-sized shielding case 10 inner, the tested surface of tested small-sized shielding case 10 is aimed at its center, little receiving antenna 1 is d with the distance of the tested surface of tested small-sized shielding case 10.The wall of tested small-sized shielding case 10 installs bi-directional RF connector 9, by little receiving antenna 1 by the bi-directional RF connector 9 on tested small-sized shielding case 10 wall and the bi-directional RF connector 9 on semi-anechoic chamber 11 wall, is connected with signal source.
Receive receiving antenna 2 and be positioned at tested small-sized shielding case 10 outside, and the tested surface of tested small-sized shielding case 10 is aimed at the center receiving receiving antenna 2, the distance received between receiving antenna 2 and the tested surface of tested small-sized shielding case 10 is D.Receive receiving antenna 2 to be connected with signal preamplifier 4 by coaxial shielding cable 6, be then connected with the receiver 5 outside darkroom by the shielded connector 9 on semi-anechoic chamber 11 wall.
Step 103, calculates shield effectiveness: use the straight-through reception value obtained in step 1 to deduct the shielding reception value obtained in step 2, can draw the shield effectiveness of small-sized shielding case receiving plane after calculating:
SE＝A
1-A
2(1)
Wherein SE is shield effectiveness;
A
1for straight-through reception is worth;
A
2for shielding reception value.
Step 104, determine to reveal position: instrument is connected according to method shown in step 102, receiving antenna 2 is replaced with little receiving antenna 1, by the weak link such as each hole, seam, vent window of near field probes near small-sized shielding case, and observe the reading of receiver 5 at any time, reading value is larger, and the leakage rate representing this place is larger, is the weak link of shielding case;
Embodiment 2 (measurement of 100MHz ~ 1GHz frequency range)
As shown in Figure 3 and Figure 4, the present embodiment arrange with the equipment of embodiment 1 and testing procedure identical, unlike, receiving antenna 2 replaces with doublet antenna 7, can carry out the detection of shield effectiveness for the electric field frequency range of 100MHz to 1GHz.
Embodiment 3 (measurement of 1GHz ~ 3GHz frequency range)
As shown in Figure 5 and Figure 6, the present embodiment arrange with the equipment of embodiment 1 and testing procedure identical, unlike, receiving antenna 2 replaces with electromagnetic horn 8, can carry out the detection of shield effectiveness for the plane wave frequency range of 1GHz to 3GHz.
Embodiment 4 (measurement of resonance band)
Because the resonance frequency of tested small-sized shielding case self is relevant with its physical dimension, therefore to measure the resonance band of small-sized shielding case, then first should determine its resonance frequency value, length, width and height are respectively to the rectangular inner cavity shielding case of a, b, l, its resonance frequency is:
After calculating resonance frequency, choose corresponding magnetic loss type absorbing material according to resonant frequency point, be pasted on shielding case inner chamber each center.Again by the method in embodiment 1,2,3, according to the difference of test frequency range, choose corresponding method and test.
This shield effectiveness method of testing can test the shield effectiveness that single side size is less than the Electric and magnetic fields frequency range of the small-sized shielding case of 177mm (4U), has degree of accuracy and dynamic range is high, versatility is good advantage simultaneously.
The present invention is based upon on the standard shielded effect test basis of GB/T12190-2006, GJB6785-2009, GJB5240-2004, for the singularity of the size of small-sized shielding case, use little receiving antenna as emitting antenna to replace receiving antenna, biconical antenna, dipole antenna and the electromagnetic horn in GB/T12190-2006, GJB6785-2009, GJB5240-2004, the shield effectiveness carrying out small-sized shielding case is measured.Simultaneously according to the size of small-sized shielding case, certain amendment is carried out to the measuring method in GB/T12190-2006, GJB6785-2009, GJB5240-2004, propose a kind of newly, for the shield effectiveness measuring method of small-sized shielding case.The present invention can measure the shield effectiveness of small-sized shielding case, can test the shield effectiveness of small-sized shielding case in resonance band simultaneously.
Claims (9)
1. the wide-band shield effectiveness proving installation of a small-sized shielding case, it is characterized in that: at least comprise little receiving antenna (1), bi-directional RF connector (9), prime amplifier (4), signal source (3), receiver (5), coaxial shielding cable (6), it is inner that described little receiving antenna (1) is positioned over small-sized shielding case (10), and little receiving antenna (1) is connected with outside signal source (3) through bi-directional RF connector (9) by coaxial shielding cable (6); Receiving antenna (2) by coaxial shielding cable (6) successively with prime amplifier (4) and receiver (5) conducting, and the center of little receiving antenna (1) and receiving antenna (2) are on a center line, little receiving antenna (1) is identical with receiving antenna (2) direction, be parallel to each other, outer distance is d+D, d is the distance of emitting antenna and tested small-sized shielding case test surfaces, and D is the distance of receiving antenna and tested small-sized shielding case test surfaces.
2. the wide-band shield effectiveness proving installation of a kind of small-sized shielding case according to claim 1, is characterized in that: described small-sized shielding case (10) is the shielding case that the size on a wherein limit is less than 4U.
3. the wide-band shield effectiveness proving installation of a kind of small-sized shielding case according to claim 1, it is characterized in that: described little receiving antenna (1) has 2 kinds, be respectively Φ 60mm and Φ 30mm, be overlap one end isocentric circular arc of welding and forming by the inner wire of RF cable with external loop layer, its essence is emitting antenna; The frequency range that wherein the little receiving antenna of Φ 60mm is corresponding is 9kHz ~ 1GHz; The frequency range that the little receiving antenna of Φ 30mm is corresponding is 1GHz ~ 3GHz.
4. the wide-band shield effectiveness proving installation of a kind of small-sized shielding case according to claim 1, it is characterized in that: described bi-directional RF connector (9) is bidirectional metal shield electric-connector, there is metal flange in the middle part of it, realize being connected with the fixing compact of tested small-sized shielding case body and semi-anechoic chamber wall by ring flange.
5. the wide-band shield effectiveness proving installation of a kind of small-sized shielding case according to claim 1, is characterized in that: the signal power amplified frequency band of described prime amplifier (4) is 9kHz to 3GHz.
6. the wide-band shield effectiveness proving installation of a kind of small-sized shielding case according to claim 1, is characterized in that: described signal source (3) is function signal generator or modulation signal generator or broadband signal source.
7. the wide-band shield effectiveness proving installation of a kind of small-sized shielding case according to claim 1, is characterized in that: described receiver (5) is frequency spectrograph.
8. the wide-band shield effectiveness proving installation of a kind of small-sized shielding case according to claim 1, is characterized in that: described coaxial shielded cable (6) is the coaxial cable meeting 9kHz to 3GHz frequency range.
9. a wide-band shield effectiveness method of testing for small-sized shielding case, is characterized in that: at least comprise:
Step 101, measure straight-through reception value: signal source (3) sends signal, by coaxial shielded cable (6) through bi-directional RF connector (9) by signal transmission to little receiving antenna (1), launched by little receiving antenna (1), received by reception receiving antenna (2) again, the signal received is passed to receiver (5) by prime amplifier (4) via bi-directional RF connector (9), the data of the antenna horizontal polarization that receiver (5) obtains and vertical polarization;
Step 102, measure shielding reception value: little receiving antenna (1) is placed in tested small-sized shielding case (10) inside, the tested surface of tested small-sized shielding case (10) is aimed at its center, and little receiving antenna (1) is d with the distance of the tested surface of tested small-sized shielding case (10); The wall of tested small-sized shielding case (10) installs bi-directional RF connector (9), by little receiving antenna (1) by the bi-directional RF connector (9) on tested small-sized shielding case (10) wall and the bi-directional RF connector (9) on semi-anechoic chamber (11) wall, be connected with signal source;
Receive receiving antenna (2) and be positioned at tested small-sized shielding case (10) outside, and the tested surface of tested small-sized shielding case (10) is aimed at the center receiving receiving antenna (2), the distance received between receiving antenna (2) and the tested surface of tested small-sized shielding case (10) is D; Receive receiving antenna (2) to be connected with signal preamplifier (4) by coaxial shielding cable (6), be then connected with the receiver (5) outside darkroom by the shielded connector (9) on semi-anechoic chamber (11) wall;
Step 103, calculates shield effectiveness: use the straight-through reception value obtained in step 1 to deduct the shielding reception value obtained in step 2, can draw the shield effectiveness of small-sized shielding case receiving plane after calculating:
SE＝A
1-A
2(1)
Wherein SE is shield effectiveness;
A
1for straight-through reception is worth;
A
2for shielding reception value;
Step 104, determine to reveal position: instrument is connected according to method shown in step 102, receiving antenna (2) is replaced with little receiving antenna (1), by the weak link such as each hole, seam, vent window of near field probes near small-sized shielding case, and observe the reading of receiver (5) at any time, reading value is larger, and the leakage rate representing this place is larger, is the weak link of shielding case.
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| CN109375020A (en) * | 2018-11-09 | 2019-02-22 | 中国汽车技术研究中心有限公司 | A kind of test device and method of new-energy automobile high-tension cable shield effectiveness |
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| CN116390468A (en) * | 2023-05-15 | 2023-07-04 | 北京航天天美科技有限公司 | Optimization method for electromagnetic shielding performance of military shelter |
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| CN113391153A (en) * | 2021-06-18 | 2021-09-14 | 深圳市精泰达科技有限公司 | Automatic alignment test system and test method for 5G millimeter wave shielding box |
| CN114024807A (en) * | 2021-11-05 | 2022-02-08 | 江西洪都航空工业集团有限责任公司 | Near-field co-channel interference cancellation mechanism and cancellation method |
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| CN116209235A (en) * | 2023-05-05 | 2023-06-02 | 北京航天天美科技有限公司 | Performance optimization method of special cabinet with high reliability for military use |
| CN116390468A (en) * | 2023-05-15 | 2023-07-04 | 北京航天天美科技有限公司 | Optimization method for electromagnetic shielding performance of military shelter |
| CN116390468B (en) * | 2023-05-15 | 2023-08-18 | 北京航天天美科技有限公司 | Optimization method for electromagnetic shielding performance of military shelter |
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