CN102636671A - Anechoic chamber with low frequency shielding property - Google Patents
Anechoic chamber with low frequency shielding property Download PDFInfo
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- CN102636671A CN102636671A CN201210123815XA CN201210123815A CN102636671A CN 102636671 A CN102636671 A CN 102636671A CN 201210123815X A CN201210123815X A CN 201210123815XA CN 201210123815 A CN201210123815 A CN 201210123815A CN 102636671 A CN102636671 A CN 102636671A
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- anechoic chamber
- steel plate
- low frequency
- shielding
- shielding material
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Abstract
The invention relates to an anechoic chamber with low frequency shielding property. The anechoic chamber is of a bilayer shielding structure formed by an inner layer and an outer layer, wherein the inner layer is formed by sequentially laminating a steel plate (1), a shielding material (11), a wave absorbing material and a wave transmitting plate (1.2), leakage of a low frequency electromagnetic field can be effectively avoided, attenuation of the low frequency electromagnetic field is increased, technical indexes of the anechoic chamber in the field of low frequency are obviously improved, the anechoic chamber is simple and feasible, construction cost of the anechoic chamber is reduced, and the anechoic chamber has relatively good cost performance and promotional value.
Description
Technical field
The invention belongs to a kind of low frequency shielding properties anechoic chamber,, especially have the technical field of structures of the anechoic chamber, of excellent low frequency shielding properties.
Background technology
Present shielded anechoic chamber kind has a variety of; Like fully anechoic chamber; Semi-anechoic chamber; The also promising other types darkroom of satisfying test request and designing though the test event in different darkrooms is different, generally includes housing shroud housing, outer casing inner wall combination one deck absorbing material layer, dark-room door, the turntable that is installed in the equipment under test in the darkroom and bracing or strutting arrangement, antenna holder system, ventilation light fixture, wave filter, ground connection, safety and electrical equipment; Surveying instrument and be used for interface board that links to each other with surveying instrument etc.; EMC test such as the test of conduction interference emission pre-value, the test of radiation disturbance emission pre-value, radiation disturbance immunity experiment all require in anechoic chamber,, to carry out, but along with the technological development of absorbing material, can very ideally solve more than or equal to the absorption loss of 30MHz frequency electromagnetic waves; Damping capacity and is difficult to accomplish 100dB for the electromagnetic wave attenuation amount between the 100kHz-30MHz more than 100dB.
Summary of the invention
The objective of the invention is for overcoming the weak point that above-mentioned prior art exists; Provide a kind of can be between 100kHz-30MHz the electromagnetic wave attenuation amount reach the anechoic chamber, of 100dB; Be not only applicable to the performance requirement of semi-anechoic chamber; And be applicable to the performance requirement of fully anechoic chamber, and can significantly reduce the darkroom construction cost, increase operation rate.
The technical scheme that the present invention adopts is following: whole darkroom is set to by internal layer and the outer double-layer shielding structure that forms; Wherein: internal layer adopts steel plate, shielding material, absorbing material and passes through the ripple plate and overlaps in regular turn; Steel plate becomes an integral body with the sealing of anechoic chamber, floor in anechoic chamber; Shielding material mainly is used for increasing the absorption loss of frequency between the 30MHz-100MHz frequency, and absorbing material mainly increases frequency more than or equal to the loss of 100MHz absorption of electromagnetic wave; Skin is made up of steel plate and shielding material, and steel plate becomes an integral body with the sealing of anechoic chamber, floor in anechoic chamber,, and shielding material adopts the NiZn Ferrite Material with high magnetic loss angle tangent to constitute.
Inner layer steel plate and outer layer plate and the weldering of anechoic chamber, floor link together, and the anechoic chamber, floor is connected with the earth earth potential through the mode of single-point grounding.Inner layer steel plate adopts screw retention to be in the same place with shielding material, adds the plastic cap nut that does not produce reflection in screw head.Absorbing material and pass through slit between the ripple plate and install after each other slit greater than 0.05mm, less than 0.2mm, be preferably 0.1mm.The thickness of shielding material own is less than or equal to 6.5mm more than or equal to 5.5mm.After shielding material is installed and the slit of another adjacent piece shielding material is less than or equal to 0.2mm.Outer layer plate adopts screw retention to be in the same place with shielding material, adds the plastic cap nut that does not produce reflection in screw head.
Beneficial effect of the present invention is:
1, after the employing double layer screen is handled, can effectively avoid the leakage of low frequency electromagnetic field;
2, increase the damping capacity of low frequency electromagnetic field;
3, significantly improve the technical indicator of darkroom in the low frequency field;
4, easy, feasible, the construction cost of reduction anechoic chamber, has cost performance and promotional value preferably.
Further specify the present invention below in conjunction with accompanying drawing and form and embodiment.
Description of drawings
Fig. 1 is a dual shield inner structure scheme of installation;
Fig. 2 is NiZn ferrite slit and the relation curve of inhaling the ripple shielding character;
Fig. 3 is NiZn ferrite thickness and the relation curve of inhaling the ripple shielding character;
Fig. 4 is the floor map of steel plate 2;
Fig. 5 is the floor map of steel plate 1.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, the present invention is made further detailed description below in conjunction with accompanying drawing.
As shown in Figure 1, double layer screen of the present invention has 7 parts and constitutes, and comprises outer shielding steel plate, steel plate 2, shielding material 2, steel plate 1, shielding material 1, absorbing material and pass through the ripple plate constituting; Outer shielding steel plate is the outermost layer structure of anechoic chamber; At the inboard steel plate 2 of laying of skin shielding steel plate through the four sides bending, use self threading pin that steel plate 2 is fixed on the outer shielding bending steel plate, ferrite wave-absorbing material is made to be screwed on steel plate 2 then; Add the plastic cap nut that does not produce reflection in screw head; In wherein every 600mm*600mm zone, there are 4 screw height to be higher than other screws, are used for mounting the spliting type absorbing material; Two screw symmetries in other two screws and the picture are to guarantee the neat and stability of spliting type absorbing material.Ferrite wave-absorbing material adopts the mode that mounts, and every ferrite all uses screw that the ferrite module is fixed in the shield on the steel plate 1, and on screw, adds plastic cap to prevent to produce reflection.The slit between the ferrite is controlled with strictness in the engineering construction aspect during installation; Guarantee shielding material 1 install after each other slit greater than 0.05mm, less than 0.2mm, be preferably 0.1mm; Each other slit was smaller or equal to 0.2mm after shielding material 2 was installed; Covering is installed reaches 100% full the laying, cover white ripple plate thoroughly on the wedge absorbing material, to beautify internal environment and to increase brightness.
As shown in Figure 2, can know the shielding material thicker by NiZn ferrite slit and the relation curve of inhaling the ripple shielding character; Reflection loss is more little, is not that we hope the result that obtains more, when thickness is more than or equal to 0.2mm; During smaller or equal to 0.5mm, basic shielding attenuation does not meet the requirements, but the slit is too high to the quality requirements of construction and installation after less than 0.05mm; Make to construction and bring very big difficulty, thereby take all factors into consideration, each other slit was greater than 0.05mm after shielding material 1 was installed; Less than 0.2mm, be preferably 0.1mm, each other slit was smaller or equal to 0.2mm after shielding material 2 was installed.
Shown in Fig. 3, table 1, table 2; Can know that by NiZn ferrite thickness and the relation curve of inhaling the ripple shielding character internal layer of basic double layer screen can be accomplished 100dB with the electromagnetic wave attenuation amount more than the 30MHz, the skin of double layer screen shields 2 thickness more than or equal to 5.5mm; Can low frequency be accomplished 100kHz smaller or equal to 6.5mm; The characteristics that combine double layer screen are simultaneously accomplished 100dB with the 100kHz damping capacity, satisfy the more better damping capacity of low frequency.
Steel plate 1 adopts screw retention to be in the same place with shielding material 1.1; Steel plate 2 adopts screw retention to be in the same place with shielding material 2.2; Can know that like Fig. 4, Fig. 5 the spacing of the steel plate 1 screwing obviously spacing than steel plate 2 screwings is little, promptly on the steel plate 1 under the condition of same area the density of screw bigger.
Table 1 is the technical indicator of common anechoic chamber,
| Frequency | shielding attenuation | field |
| 30MHz | ≥ 70dB | magnetic field |
| 100MHz | ≥ 100dB | plane wave |
| 500MHz | ≥ 100dB | plane wave |
| 1GHz | ≥ 100dB | plane wave |
| 18GHz | ≥ 100dB | microwave |
Table 2 is technical indicators that anechoic chamber, of the present invention can reach
| Frequency | shielding attenuation | field |
| 100kHz | ≥ 100dB | magnetic field |
| 1MHz | ≥ 100dB | magnetic field |
| 30MHz | ≥ 100dB | magnetic field |
| 100MHz | ≥ 100dB | plane wave |
| 500MHz | ≥ 100dB | plane wave |
| 1GHz | ≥ 100dB | plane wave |
| 18GHz | ≥ 100dB | microwave |
Claims (8)
1. the anechoic chamber, of a low frequency shielding properties is characterized in that, whole darkroom is set to by internal layer and the outer double-layer shielding structure that forms; Wherein: internal layer adopts steel plate (1), shielding material (1.1), absorbing material and passes through ripple plate (1.2) and overlaps in regular turn; Steel plate (1) becomes an integral body with the sealing of anechoic chamber, floor in anechoic chamber; Shielding material (11) mainly is used for increasing the absorption loss of frequency between the 30MHz-100MHz frequency, and absorbing material mainly increases frequency more than or equal to the loss of 100MHz absorption of electromagnetic wave; Skin is made up of steel plate (2) and shielding material (2.2), and steel plate (2) becomes an integral body with the sealing of anechoic chamber, floor in anechoic chamber,, and shielding material (2.2) adopts the NiZn Ferrite Material with high magnetic loss angle tangent to constitute.
2. the anechoic chamber, of a kind of low frequency shielding properties according to claim 1 is characterized in that, steel plate (1) and steel plate (2) link together with the weldering of anechoic chamber, floor, and the anechoic chamber, floor is connected with the earth earth potential through the mode of single-point grounding.
3. the anechoic chamber, of a kind of low frequency shielding properties according to claim 1 and 2 is characterized in that, steel plate (1) and shielding material (1.1) adopt screw retention together, add the plastic cap nut that does not produce reflection in screw head.
4. the anechoic chamber, of a kind of low frequency shielding properties according to claim 1 is characterized in that, absorbing material and pass through slit between the ripple plate (1.2) and install after each other slit greater than 0.05mm, less than 0.2mm, be preferably 0.1mm.
5. the anechoic chamber, of a kind of low frequency shielding properties according to claim 1 is characterized in that, the thickness of shielding material (2.2) own is less than or equal to 6.5mm more than or equal to 5.5mm.
6. the anechoic chamber, of a kind of low frequency shielding properties according to claim 1 is characterized in that, after shielding material (2.2) is installed and the slit of another adjacent piece shielding material 2 is less than or equal to 0.2mm.
7. the anechoic chamber, of a kind of low frequency shielding properties according to claim 1 is characterized in that, steel plate (2) and shielding material (2.2) adopt screw retention together, add the plastic cap nut that does not produce reflection in screw head.
8. the anechoic chamber, of a kind of low frequency shielding properties according to claim 1 is characterized in that, steel plate (1) screwing gap ratio steel plate (2) screwing spacing is little.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123815.XA CN102636671B (en) | 2012-04-25 | 2012-04-25 | Anechoic chamber with low frequency shielding property |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123815.XA CN102636671B (en) | 2012-04-25 | 2012-04-25 | Anechoic chamber with low frequency shielding property |
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| Publication Number | Publication Date |
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| CN102636671A true CN102636671A (en) | 2012-08-15 |
| CN102636671B CN102636671B (en) | 2014-08-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944800A (en) * | 2012-11-30 | 2013-02-27 | 中国西电电气股份有限公司 | High-voltage electrical appliance electromagnetic radiation emission type testing system |
| CN103619153A (en) * | 2013-12-02 | 2014-03-05 | 中国建筑一局(集团)有限公司 | Superlarge dark room and construction method for superlarge dark room |
| CN103619153B (en) * | 2013-12-02 | 2016-11-30 | 中国建筑一局(集团)有限公司 | A kind of super large darkroom and the construction method in super large darkroom thereof |
| CN109640613A (en) * | 2018-12-12 | 2019-04-16 | 许露敏 | A kind of reply New-energy electric vehicle EMC way to solve the problem |
| CN111163625A (en) * | 2020-01-08 | 2020-05-15 | 李志宏 | Semi-anechoic chamber and floor structure thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2874722Y (en) * | 2005-09-23 | 2007-02-28 | 宝钢集团上海五钢有限公司 | Super low frequency electromagnet shielding device of multilay composite structure |
| JP2009026837A (en) * | 2007-07-18 | 2009-02-05 | Tdk Corp | Radio wave and acoustic wave absorber, and radio wave and acoustic wave anechoic chamber using the absorber |
| JP2010206064A (en) * | 2009-03-05 | 2010-09-16 | Tdk Corp | Radio wave absorber and method of manufacturing the same |
| WO2011016109A1 (en) * | 2009-08-04 | 2011-02-10 | 株式会社リケン | Wave absorber |
| KR20110114246A (en) * | 2010-04-13 | 2011-10-19 | 고려대학교 산학협력단 | Anechoic chamber having ferrite resonator |
-
2012
- 2012-04-25 CN CN201210123815.XA patent/CN102636671B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2874722Y (en) * | 2005-09-23 | 2007-02-28 | 宝钢集团上海五钢有限公司 | Super low frequency electromagnet shielding device of multilay composite structure |
| JP2009026837A (en) * | 2007-07-18 | 2009-02-05 | Tdk Corp | Radio wave and acoustic wave absorber, and radio wave and acoustic wave anechoic chamber using the absorber |
| JP2010206064A (en) * | 2009-03-05 | 2010-09-16 | Tdk Corp | Radio wave absorber and method of manufacturing the same |
| WO2011016109A1 (en) * | 2009-08-04 | 2011-02-10 | 株式会社リケン | Wave absorber |
| KR20110114246A (en) * | 2010-04-13 | 2011-10-19 | 고려대학교 산학협력단 | Anechoic chamber having ferrite resonator |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944800A (en) * | 2012-11-30 | 2013-02-27 | 中国西电电气股份有限公司 | High-voltage electrical appliance electromagnetic radiation emission type testing system |
| CN102944800B (en) * | 2012-11-30 | 2015-04-22 | 中国西电电气股份有限公司 | High-voltage electrical appliance electromagnetic radiation emission type testing system |
| CN103619153A (en) * | 2013-12-02 | 2014-03-05 | 中国建筑一局(集团)有限公司 | Superlarge dark room and construction method for superlarge dark room |
| CN103619153B (en) * | 2013-12-02 | 2016-11-30 | 中国建筑一局(集团)有限公司 | A kind of super large darkroom and the construction method in super large darkroom thereof |
| CN109640613A (en) * | 2018-12-12 | 2019-04-16 | 许露敏 | A kind of reply New-energy electric vehicle EMC way to solve the problem |
| CN111163625A (en) * | 2020-01-08 | 2020-05-15 | 李志宏 | Semi-anechoic chamber and floor structure thereof |
| CN111163625B (en) * | 2020-01-08 | 2022-05-13 | 李志宏 | Semi-anechoic chamber and floor structure thereof |
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| Publication number | Publication date |
|---|---|
| CN102636671B (en) | 2014-08-27 |
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