CN202916362U - Device for testing the shielding effectiveness of small shielding cavity - Google Patents
Device for testing the shielding effectiveness of small shielding cavity Download PDFInfo
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- CN202916362U CN202916362U CN 201220579118 CN201220579118U CN202916362U CN 202916362 U CN202916362 U CN 202916362U CN 201220579118 CN201220579118 CN 201220579118 CN 201220579118 U CN201220579118 U CN 201220579118U CN 202916362 U CN202916362 U CN 202916362U
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- shield effectiveness
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Abstract
The utility model provides a device for testing the shielding effectiveness of a small shielding cavity. The device is characterized in that: a shielding dark cavity and a shielding cavity are two cavities which are separated by a metal wall plate, a wave absorption material is arranged on the wall surface of the shielding dark cavity, and the shielding dark cavity and the shielding cavity are independently ground; a receiving instrument is arranged in the shielding cavity, the other devices are arranged in the shielding dark cavity, a bidirectional radio frequency connector is arranged on the wall surface of the metal wall plate; a near field test antenna is communicated with the bidirectional radio frequency connector and the receiving instrument on the wall surface of the metal wall plate in turn by a coaxial cable; a transmitting antenna is communicated with a head amplifier and a signal source in turn by the coaxial cable, and the above elements are arranged in the shielding cavity, and the center of the transmitting antenna is aimed at the center of the near field test antenna; and the test process is realized by three steps of testing the direct receiving value, testing the radio frequency leakage amount and computing the shielding effectiveness. The method is simple and accurate.
Description
Technical field
The utility model relates to Electronic Testing and shield effectiveness technical field of measurement and test, is a kind of proving installation of small-sized shielding cavity shield effectiveness.
Background technology
In recent years, in the electromagnetic compatibility field, anti-electromagnetic interference performance for product requires more and more higher, because the electromagnetic interference (EMI) emissions frequency range of each electronic product is more and more wider, and low-frequency range is particularly intensive, and this is so that the anti-electromagnetic interference capability of product requires more and more strictlyer, and the ability that determines its anti-electromagnetic interference (EMI) in space often depends on the shield effectiveness of its equipment cavity self, because modern electronic equipment develops towards miniaturization, thereby so that equipment volume reduce gradually; And the shield effectiveness of a cavity of need checking, then must be in a transmission antennas transmit signal, so that putting into this inside cavity, a receiving antenna carries out signal reception test, because employed screen effect test antenna mostly is narrow-band antenna in this field at present, and volume is large, when the shield effectiveness of test wisp, often antenna can not be placed on inside cavity and carry out shield effectiveness reception test, this just so that himself shield effectiveness of the little cavity of volume often can't be verified, therefore verifies the shield effectiveness of small-sized cavity in the urgent need to a kind of proving installation of small-sized shielding cavity shield effectiveness.
The utility model content
The purpose of this utility model provides a kind of proving installation of small-sized shielding cavity shield effectiveness, is applicable to the shield effectiveness test of small-sized cavity, rack, shielding camera bellows and large-scale screened room, shielding shelter.
The technical solution of the utility model is a kind of proving installation of small-sized shielding cavity shield effectiveness, his equipment comprises near-field test antenna, bi-directional RF connector, emitting antenna, prime amplifier, signal source, receiving instrument, coaxial cable and shielded anechoic chamber and screened room at least, it is characterized in that: shielded anechoic chamber and screened room are two cavitys that are divided into by metal wallboard, absorbing material shielded anechoic chamber and screened room are set on the wall of shielded anechoic chamber all connect separately the earth; Receiving instrument is arranged in the screened room, and all the other equipment are arranged in the shielded anechoic chamber, and the bi-directional RF connector is arranged on the metal wallboard wall; The near-field test antenna is arranged in the shielded anechoic chamber, and the near-field test antenna is by bi-directional RF connector and receiving instrument conducting on the coaxial cable successively metal wallboard wall; Emitting antenna by coaxial cable successively with prime amplifier and signal source conducting, they are arranged in the screened room, and the center of emitting antenna is to the center of near-field test antenna.
Described bi-directional RF connector is the bidirectional metal shield electric-connector, and there is metal flange the position, intermediate portion, is fixedly connected with by the wall of ring flange with metal wallboard and tested cavity.
Described near-field test antenna is that diameter is 3 centimetres to 12 centimetres annulus feed body, is that its essence is receiving antenna, for the magnetic field frequency range of 9KHz to 30MHz by the inner wire of RF cable and an end isocentric circular arc of external loop layer overlap joint welding formation; Emitting antenna is the toroidal magnetic field antenna, for the magnetic field frequency range of 9KHz to 30MHz.
Described near-field test antenna and emitting antenna can also be dipole antennas, for electric field frequency range or the microwave horn antenna of 100MHz to 1GHz, for the plane wave frequency range of 1GHz to 40GHz.
It is 9KHz to 40GHz that the signal power of described prime amplifier is amplified frequency range.
Described signal source is function signal generator, modulation signal generator or broadband signal source.
Described receiving instrument is receiver or frequency spectrograph.
Described coaxial cable is the coaxial cable that satisfies 9KHz to 40GHz frequency range.
Described shielded anechoic chamber and screened room are semi-anechoic chambers, and they all connect separately the earth.
Described absorbing material is the packaging splitter shape absorber of isocyanurate foam type, nonwoven fabrics nonflammable or silicate board metal film.
Characteristics of the present utility model are the conversions by shielding syndeton and antenna, but the shield effectiveness of the Electric and magnetic fields frequency range of testing small volumes cavity, have advantages of that precision and dynamic range are high, versatility good simultaneously.
Description of drawings
Below in conjunction with embodiment the utility model is further described:
Fig. 1 is the straight-through test schematic diagram of 9KHz to 30MHz magnetic field frequency range;
Fig. 2 is that the shield effectiveness of 9KHz to 30MHz magnetic field frequency range detects schematic layout pattern;
Fig. 3 is the straight-through test schematic diagram of 100MHz to 1GHz electric field frequency range;
Fig. 4 is that the shield effectiveness of 100MHz to 1GHz electric field frequency range detects schematic layout pattern;
Fig. 5 is the straight-through test schematic diagram of 1GHz to 40GHz plane wave frequency range;
Fig. 6 is that the shield effectiveness of 1GHz to 40GHz plane wave frequency range detects schematic layout pattern.
Among the figure: 1, near-field test antenna; 2, bi-directional RF connector; 3, emitting antenna; 4, dipole antenna; 5, microwave horn antenna; 6, prime amplifier; 7, signal source; 8, receiving instrument; 9, coaxial cable; 10, shielded anechoic chamber; 11, screened room; 12, absorbing material; 13, metal wallboard; 14, tested cavity; D, emitting antenna are apart from the distance of measured point; D, receiving antenna are apart from the distance of measured point.
Embodiment
Embodiment 1
As depicted in figs. 1 and 2, semi-anechoic chamber is a kind of isolation environment that adopts for fear of impact test authenticity in order to prevent incoming signal and directly receiver to be disturbed and arranging.
Be provided with bi-directional RF connector 2 on the metal wallboard 13, in shielded anechoic chamber 10 and screened room 11, receiving instrument 8 places separately screened room 11 inside respectively at the two ends of bi-directional RF connector 2.
Bi-directional RF connector 2 is bidirectional metal shield electric-connectors, and there is metal flange the position, intermediate portion, and is fixing by ring flange and metal wallboard 15.
Receiving instrument 8 is receiver or frequency spectrograph.
Near-field test antenna 1 places in the shielded anechoic chamber 10, by an end conducting, the other end of bi-directional RF connector 2 and receiving instrument 8 conductings of the bi-directional RF connector 2 of setting on coaxial cable 9 and the metal wallboard 13.
Near-field test antenna 1 is that diameter is 3 centimetres to 12 centimetres annulus feed body, is that its essence is receiving antenna, for the magnetic field frequency range of 9KHz to 30MHz by the inner wire of RF cable and an end isocentric circular arc of external loop layer overlap joint welding formation.
Emitting antenna 3 and prime amplifier 6 and signal source 7 are by coaxial cable 9 conductings, and they also place in the shielded anechoic chamber 10, and the centrally aligned of the center of emitting antenna 3 and near-field test antenna 1.
Signal source 7 is function signal generator, modulation signal generator or broadband signal source.
The method of testing of this small-sized shielding cavity shield effectiveness is carried out according to following step:
Step 1 is surveyed straight-through reception value; Signal source 7 is sent signal, and incoming signal is behind prime amplifier 6, by emitting antenna 3 emissions, received by near-field test antenna 1 again, and by bi-directional RF connector 2 signal being passed to receiving instrument 8, receiving instrument 8 obtains the data of antenna horizontal polarization and vertical polarization, is straight-through reception value;
After setting tested cavity, signal source 7 is sent signal, incoming signal is behind prime amplifier 6, by emitting antenna 3 emissions, after incident wave passes the receiving plane of tested cavity 14, received by near-field test antenna 1 again, and by two bi-directional RF connectors 2 signal is passed to receiving instrument 8, receiving instrument 8 obtains the data of this moment antenna horizontal polarization and vertical polarization, is the radio-frequency leakage amount of tested cavity 14 receiving planes;
The method of testing of this small-sized shielding cavity shield effectiveness is by the conversion of shielding syndeton and antenna, but the shield effectiveness of the Electric and magnetic fields frequency range of testing small volumes cavity, has advantages of that precision and dynamic range are high, versatility good simultaneously.
As shown in Figure 3 and Figure 4, equipment setting and the testing procedure of the present embodiment and embodiment 1 are identical, different is that near-field test antenna 1 and emitting antenna 3 adopt dipole antenna 4, can carry out for the electric field frequency range of 100MHz to 1GHz the detection of shield effectiveness.
As shown in Figure 5 and Figure 6, equipment setting and the testing procedure of embodiment and embodiment 1 are identical, and different is that near-field test antenna 1 and emitting antenna 3 adopt microwave horn antenna 5, can carry out for the plane wave frequency range of 1GHz to 40GHz the detection of shield effectiveness.
The parts that the present embodiment is not described in detail and structure belong to well-known components and common structure or the conventional means of the industry, here not one by one narration.
Claims (10)
1. the proving installation of a small-sized shielding cavity shield effectiveness, his equipment comprises near-field test antenna (1) at least, bi-directional RF connector (2), emitting antenna (3), prime amplifier (6), signal source (7), receiving instrument (8), coaxial cable (9) and shielded anechoic chamber (10) and screened room (11), it is characterized in that: shielded anechoic chamber (10) and screened room (11) are two cavitys that are divided into by metal wallboard (13), absorbing material (12) shielded anechoic chamber (10) are set on the wall of shielded anechoic chamber (10) and screened room (11) all connects separately the earth; Receiving instrument (8) is arranged in the screened room (11), and all the other equipment are arranged in the shielded anechoic chamber (10), and bi-directional RF connector (2) is arranged on metal wallboard (13) wall; Near-field test antenna (1) is arranged in the shielded anechoic chamber (10), and near-field test antenna (1) is by bi-directional RF connector (2) and receiving instrument (8) conducting on the coaxial cable (9) successively metal wallboard (15) wall; Emitting antenna (3) by coaxial cable (9) successively with prime amplifier (6) and signal source (7) conducting, they are arranged in the screened room (10), and the center of emitting antenna (3) is to the center of near-field test antenna (1).
2. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described bi-directional RF connector (2) is the bidirectional metal shield electric-connector, there is metal flange the position, intermediate portion, is fixedly connected with the wall of metal wallboard (15) with tested cavity (17) by ring flange.
3. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described near-field test antenna (1) is that diameter is 3 centimetres to 12 centimetres annulus feed body, by the inner wire of RF cable and an end isocentric circular arc of external loop layer overlap joint welding formation, its essence is receiving antenna, for the magnetic field frequency range of 9KHz to 30MHz; Emitting antenna (3) is the toroidal magnetic field antenna, for the magnetic field frequency range of 9KHz to 30MHz.
4. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described near-field test antenna (1) and emitting antenna (3) can also be dipole antenna (4), for electric field frequency range or the microwave horn antenna 5 of 100MHz to 1GHz, for the plane wave frequency range of 1GHz to 40GHz.
5. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: it is 9KHz to 40GHz that the signal power of described prime amplifier (6) is amplified frequency range.
6. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described signal source (7) is function signal generator, modulation signal generator or broadband signal source.
7. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described receiving instrument (8) is receiver or frequency spectrograph.
8. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described coaxial cable (9) is the coaxial cable that satisfies 9KHz to 40GHz frequency range.
9. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described shielded anechoic chamber (10) and screened room (11) are semi-anechoic chambers, and they all connect separately the earth.
10. the proving installation of a kind of small-sized shielding cavity shield effectiveness described in according to claim 1, it is characterized in that: described absorbing material (12) is the packaging splitter shape absorber of isocyanurate foam type, nonwoven fabrics nonflammable or silicate board metal film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220579118 CN202916362U (en) | 2012-11-06 | 2012-11-06 | Device for testing the shielding effectiveness of small shielding cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220579118 CN202916362U (en) | 2012-11-06 | 2012-11-06 | Device for testing the shielding effectiveness of small shielding cavity |
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| Publication Number | Publication Date |
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| CN202916362U true CN202916362U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220579118 Expired - Lifetime CN202916362U (en) | 2012-11-06 | 2012-11-06 | Device for testing the shielding effectiveness of small shielding cavity |
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| CN (1) | CN202916362U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439536A (en) * | 2013-08-29 | 2013-12-11 | 陕西海泰电子有限责任公司 | Stirring device for electromagnetic shielding shell shielding effectiveness test |
| CN104360201A (en) * | 2014-11-25 | 2015-02-18 | 中国人民解放军军械工程学院 | Electromagnetic field shielding performance testing system for dust type dielectric materials |
| CN108107290A (en) * | 2017-12-04 | 2018-06-01 | 北京控制与电子技术研究所 | A kind of small-scale structure body shield effectiveness test method based on transfger impedance |
| CN111122987A (en) * | 2019-12-26 | 2020-05-08 | 华北电力大学 | Magnetic field shielding effectiveness prediction method and system |
-
2012
- 2012-11-06 CN CN 201220579118 patent/CN202916362U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439536A (en) * | 2013-08-29 | 2013-12-11 | 陕西海泰电子有限责任公司 | Stirring device for electromagnetic shielding shell shielding effectiveness test |
| CN103439536B (en) * | 2013-08-29 | 2016-12-28 | 陕西海泰电子有限责任公司 | A kind of agitating device for the test of electromagnetic shielding shell shield effectiveness |
| CN104360201A (en) * | 2014-11-25 | 2015-02-18 | 中国人民解放军军械工程学院 | Electromagnetic field shielding performance testing system for dust type dielectric materials |
| CN108107290A (en) * | 2017-12-04 | 2018-06-01 | 北京控制与电子技术研究所 | A kind of small-scale structure body shield effectiveness test method based on transfger impedance |
| CN111122987A (en) * | 2019-12-26 | 2020-05-08 | 华北电力大学 | Magnetic field shielding effectiveness prediction method and system |
| CN111122987B (en) * | 2019-12-26 | 2020-12-04 | 华北电力大学 | Magnetic field shielding effectiveness prediction method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220630 Address after: 215128 room 103, building 13, Northwest District, Suzhou nano City, No. 99, Jinjihu Avenue, Suzhou Industrial Park, Suzhou area, Suzhou pilot Free Trade Zone, Jiangsu Province Patentee after: Boke electric measurement (Suzhou) Technology Co.,Ltd. Address before: Room 2-10502, east area, modern enterprise center, No. 69, Jinye Road, high tech Zone, Xi'an, Shaanxi 710075 Patentee before: Xi'an Kairong Electronic Technologies Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |
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| CX01 | Expiry of patent term |