CN217363686U - Electric wave absorbing material for building electromagnetic compatibility test environment - Google Patents
Electric wave absorbing material for building electromagnetic compatibility test environment Download PDFInfo
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- CN217363686U CN217363686U CN202220954887.8U CN202220954887U CN217363686U CN 217363686 U CN217363686 U CN 217363686U CN 202220954887 U CN202220954887 U CN 202220954887U CN 217363686 U CN217363686 U CN 217363686U
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Abstract
The utility model provides an electric wave absorbing material for building an electromagnetic compatibility testing environment, which comprises a lower layer, an intermediate layer and a truncated cone unit, wherein the volume resistance of the intermediate layer is larger than the volume resistance of the truncated cone unit; the truncated cone unit comprises a bottom layer and a plurality of integrated truncated cones arranged on the bottom layer, wherein the lower layer, the middle layer and the bottom layer are sequentially bonded, the lower layer is made of high-density polyurethane sponge, the middle layer is made of high-density polyurethane sponge, and the truncated cone unit is made of polyurethane sponge. The utility model also discloses an electromagnetic compatibility test environment, four walls and the ceiling of its darkroom are provided with the electric wave absorbent material that is used for setting up electromagnetic compatibility test environment. The utility model is used for build electromagnetic compatibility test environment's electric wave absorbing material is multilayer structure, and the size is little, and the cost is low, can satisfy the miniaturized demand of different anechoic chambers.
Description
Technical Field
The utility model relates to an anechoic chamber that electromagnetic compatibility test adopted uses with absorbing material, especially relates to an absorbing material for buildding electromagnetic compatibility test environment's electric wave.
Background
The anechoic chamber is mainly used for replacing an open field to carry out electromagnetic compatibility testing, and comprises an anechoic chamber with a three-meter method and an anechoic chamber with a ten-meter method according to testing distances. The darkroom evaluation indexes are normalized field attenuation (NSA), Field Uniformity (FU) and field voltage standing wave ratio (SVSWR), and the standard indexes are as follows:
the deviation of the normalized field attenuation and the theoretical value is within +/-4 dB (30MHz-1 GHz);
the field uniformity is between 0 and 6dB (30MHz to 18 GHz);
the site voltage standing wave ratio is less than 6dB (1-18 GHz).
Wave-absorbing materials are arranged on the four side walls and the ceiling in the darkroom to achieve the indexes. Because the application frequency is very low, the wave-absorbing material adopted at present has two schemes: firstly, the high-angle cone wave-absorbing material generally needs a material with a height of 1200mm (three meters method) and a height of 2000mm (ten meters method), needs a darkroom with a larger size, and increases the construction cost of the darkroom; and secondly, the ferrite and the pyramid wave-absorbing material are compounded for use, but the ferrite and the pyramid wave-absorbing material are directly compounded, so that the matching is difficult to achieve the optimal state, and the ferrite has high manufacturing cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electric wave absorbing material for buildding electromagnetic compatibility test environment to the big, the high problem of cost of current absorbing material size, this electric wave absorbing material is multilayer structure, and the size is little, and the cost is low, can satisfy the miniaturized demand of different anechoic chambers.
In order to achieve the above object, the utility model adopts the following technical scheme: an electric wave absorbing material for building an electromagnetic compatibility test environment comprises a lower layer, a middle layer and a truncated cone unit, wherein the volume resistance of the middle layer is greater than the volume resistance of the truncated cone unit; the truncated cone unit comprises a bottom layer and a plurality of integrated truncated cones arranged on the bottom layer, wherein the lower layer, the middle layer and the bottom layer are sequentially bonded, the lower layer is made of high-density polyurethane sponge, the middle layer is made of high-density polyurethane sponge, and the truncated cone unit is made of polyurethane sponge.
Further, the thickness ratio of the lower layer, the middle layer and the truncated cone unit is 2:3-4:45-64, preferably the thickness of the lower layer is 20mm, the thickness of the middle layer is 30-40mm, and the thickness of the truncated cone unit is 450-640 mm.
Further, the permeability μ r' of the lower layer is 80, and μ r "is 300 @30 MHz.
Further, the high-density polyurethane sponge used for the lower layer is a high-density polyurethane sponge impregnated with ferrite powder, preferably a high-density polyurethane sponge impregnated with 90 wt% of ferrite powder. The material can be purchased from SAB series products of Douguese microwave absorbing materials, Inc.
Further, the middle layer comprises a first layer, a second layer, a third layer and a fourth layer which are sequentially bonded, the first layer is bonded with the bottom layer, the fourth layer is bonded with the lower layer, and the thickness ratio of the first layer to the second layer to the third layer to the fourth layer is 3-4:5-6:7-10: 15-20.
Further, the volume resistances of the first layer, the second layer, the third layer, and the fourth layer are 2 × 10, respectively 7 Ω·cm、2×10 8 Ω·cm、2×10 9 Omega cm and 2X 10 10 Omega cm; the high-density polyurethane sponge wave-absorbing material adopted by the middle layer can be purchased, such as microwave absorbing material Limited company of Toxin, and can also be prepared by itself, and the preparation method of the wave-absorbing material disclosed in patent CN110483835A can be selected.
Further, the volume resistance of the polyurethane sponge adopted by the truncated cone unit is 2 multiplied by 10 6 Ω·cm。
Further, the height ratio of the bottom layer to the truncated cone is 1: 7-8.
Another object of the utility model is to also disclose an electromagnetic compatibility test environment, including the darkroom, four walls and the ceiling of darkroom are provided with the electric wave absorbent material that is used for building electromagnetic compatibility test environment.
And furthermore, the electric wave absorption material is used for a three-meter-method electric wave dark room, adopts an electric wave absorption material for building an electromagnetic compatibility test environment, and has a total height of 500 mm.
Further, the electric wave absorbing material used for building the electromagnetic compatibility testing environment and adopted in the ten-meter-method electric wave dark room has the total height of 700 mm.
The utility model is used for build electromagnetic compatibility test environment's electric wave absorbing material, compare with prior art and have following advantage:
1) the utility model discloses electric wave absorbing material is multilayer structure, can be according to present market demand design for 500mm height (be used for three meters method anechoic chamber) and 700mm height (be used for ten meters method anechoic chamber), can extend highly satisfying new demand according to this utility model's design idea afterwards.
2) The utility model discloses electric wave absorbing material formula electromagnetic compatibility absorbing material as an organic whole for the high angle awl scheme of traditional integral type, reduces 500mm (three meters method) and 700 (ten meters method) with the angle awl height from 1200mm (three meters method) and 2000 (ten meters method), has reduced the darkroom size, has reduced darkroom construction cost.
3) For ferrite and pyramid absorbing material composite scheme, the utility model discloses thereby the electric wave absorbing material need not use the ferrite cost is reduced, and the structural installation of integral type is also simpler, and low frequency (30M-100M) performance has promoted 1-2dB simultaneously, and the performance of 30MHz-18GHz sees table 1.
TABLE 1 the utility model discloses a performance that is used for buildding electromagnetic compatibility test environment's electric wave absorbing material 30MHz-18GHz
4) The lower layer of the electric wave absorbing material of the utility model can select the high density polyurethane sponge which adopts the mixed liquid of the magnetic powder with high solid content and high magnetic conductivity, and mainly acts on 30MHz-1 GHz.
The truncated cone unit is soaked in the conductive liquid, and mainly acts on 500MHz-18 GHz.
The middle layer is used as a matching layer, the optimal overall performance matching is realized by the resistance gradient gradual change structure realized by different bulk resistance materials, the bandwidth of the overall material is expanded to 30MHz-18GHz, the darkroom performance is better optimized, and the specific test data is as follows:
the deviation of the normalized field attenuation and the theoretical value is within +/-3 dB (30MHz-1 GHz);
the field uniformity is between 0 and 5.5dB (30MHz and 18 GHz);
the standing wave ratio of the field voltage is less than 5dB (1-18 GHz).
To sum up, the utility model is used for build electromagnetic compatibility test environment's electric wave absorbing material can install inside in order to reach the requirement of electromagnetic compatibility test place in the darkroom. The utility model is used for build electromagnetic compatibility test environment's electric wave absorbing material, put in ground auxiliary test when still being used to test place homogeneity.
Drawings
Fig. 1 is a perspective view of an electric wave absorbing material for constructing an electromagnetic compatibility test environment of example 1;
FIG. 2 is a front view of an electric wave absorbing material for constructing an electromagnetic compatibility test environment according to example 1;
fig. 3 is a plan view of an electric wave absorbing material for constructing an electromagnetic compatibility test environment of example 1;
fig. 4 is a perspective view of an electric wave absorbing material for constructing an electromagnetic compatibility test environment of example 2;
FIG. 5 is a front view of an electric wave absorbing material for constructing an electromagnetic compatibility test environment according to example 2;
fig. 6 is a plan view of an electric wave absorbing material for constructing an electromagnetic compatibility test environment according to example 2.
Detailed Description
The invention is further illustrated below with reference to the following examples:
example 1
The embodiment discloses an electric wave absorbing material for building an electromagnetic compatibility test environment, as shown in fig. 1-3, the electric wave absorbing material comprises a lower layer 1, a middle layer 2 and a truncated cone unit 3, wherein the thickness of the lower layer 1 is 20mm, the thickness of the middle layer 2 is 30mm, the thickness of the truncated cone unit 3 is 450mm, the total height of the electric wave absorbing material for building the electromagnetic compatibility test environment is 500mm, and the length and width of the bottom of the electric wave absorbing material are 600 × 600 mm.
The truncated cone unit 3 comprises a bottom layer and nine truncated cones integrally arranged on the bottom layer, wherein the lower layer 1, the middle layer 2 and the bottom layer are sequentially bonded. The height ratio of the bottom layer to the truncated cone is 1: 8.
The high-density polyurethane sponge adopted by the lower layer 1 is high-density polyurethane sponge impregnated with ferrite powder containing 90 wt%. The permeability μ r' of the underlayer is 80 and μ r "is 300 @30 MHz. The lower layer 1 was purchased from SAB series products from tokyo microwave absorbing materials, inc.
The volume resistance of the polyurethane sponge adopted by the truncated cone unit 3 is 2 multiplied by 10 6 Ω·cm。
The electric wave absorbing material for building the electromagnetic compatibility testing environment can be used in a three-meter-method electric wave dark room, and the lower layer of the electric wave absorbing material is adhered to four wall surfaces and a ceiling of the dark room when the electric wave absorbing material is used.
Example 2
The embodiment discloses an electric wave absorbing material for building an electromagnetic compatibility test environment, as shown in fig. 4-6, the electric wave absorbing material comprises a lower layer 1, a middle layer 2 and a truncated cone unit 3, wherein the thickness of the lower layer 1 is 20mm, the thickness of the middle layer 2 is 40mm, the thickness of the truncated cone unit 3 is 640mm, the total height of the electric wave absorbing material for building the electromagnetic compatibility test environment is 700mm, and the length and width of the bottom of the electric wave absorbing material are 600 × 600 mm.
The truncated cone unit 3 comprises a bottom layer and nine truncated cones integrally arranged on the bottom layer, wherein the lower layer 1, the middle layer 2 and the bottom layer are sequentially bonded. The height ratio of the bottom layer to the truncated cone is 1: 7.
High density of the lower layer 1The polyurethane sponge is a high density polyurethane sponge impregnated with a powder containing 90 wt% ferrite. The permeability μ r' of the lower layer is 80, μ r "is 300, @30 MHz. Middle level 2 is including the first layer, second floor, third layer and the fourth layer that bond in order, the first layer bonds with the bottom, the fourth layer bonds with lower floor 1, the thickness on first layer, second floor, third layer and fourth layer is 3mm, 5mm, 7mm and 15mm respectively. The volume resistance of the first layer, the second layer, the third layer and the fourth layer is respectively 2 multiplied by 10 7 Ω·cm、2×10 8 Ω·cm、2×10 9 Omega cm and 2X 10 10 Omega cm; the high-density polyurethane sponge wave-absorbing material adopted in the middle layer can be purchased, such as FRTL series products sold by great-trusted microwave absorbing material Co., Ltd, and the preparation of the wave-absorbing material can also be realized by adopting a rolling process disclosed by CN110483835A to dip conductive liquid.
The volume resistance of the polyurethane sponge adopted by the truncated cone unit 3 is 2 multiplied by 10 6 Ω·cm。
The electric wave absorbing material for building the electromagnetic compatibility test environment can be used in a ten-meter-method electric wave dark room, and the lower layer of the electric wave absorbing material is adhered to four wall surfaces and a ceiling of the dark room when the electric wave absorbing material is used.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. The electric wave absorbing material for building an electromagnetic compatibility test environment is characterized by comprising a lower layer (1), an intermediate layer (2) and a truncated cone unit (3), wherein the volume resistance of the intermediate layer (2) is greater than the volume resistance of the truncated cone unit (3); the truncated cone unit (3) comprises a bottom layer and a plurality of truncated cones integrally arranged on the bottom layer, the lower layer (1), the middle layer (2) and the bottom layer are sequentially bonded, the lower layer is high-density polyurethane sponge, the middle layer is high-density polyurethane sponge, and the truncated cone unit is polyurethane sponge.
2. The electric wave absorbing material for building an electromagnetic compatibility test environment according to claim 1, wherein the thickness ratio of the lower layer (1), the intermediate layer (2) and the truncated cone unit (3) is 2:3-4: 45-64.
3. The electric wave absorbing material for building an electromagnetic compatibility test environment according to claim 1, wherein the middle layer (2) comprises a first layer, a second layer, a third layer and a fourth layer which are sequentially bonded, the first layer is bonded to the bottom layer, the fourth layer is bonded to the lower layer (1), and the thickness ratio of the first layer to the second layer to the third layer to the fourth layer is 3-4:5-6:7-10: 15-20.
4. An electric wave absorbing material for constructing an electromagnetic compatibility test environment according to claim 3, wherein the volume resistances of said first layer, said second layer, said third layer and said fourth layer are respectively 2 x 10 7 Ω·cm、2×10 8 Ω·cm、2×10 9 Omega cm and 2X 10 10 Ω·cm。
5. The electric wave absorbing material for building an electromagnetic compatibility test environment according to claim 1, wherein a volume resistance of polyurethane sponge used for the truncated cone unit (3) is 2 x 10 6 Ω·cm。
6. An electric wave absorbing material for constructing an electromagnetic compatibility test environment according to claim 1, wherein a height ratio of said base layer to said truncated cone is 1: 7-8.
7. An electromagnetic compatibility test environment, comprising a darkroom, wherein the four wall surfaces and the ceiling of the darkroom are provided with the electric wave absorbing material for building the electromagnetic compatibility test environment according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220954887.8U CN217363686U (en) | 2022-04-24 | 2022-04-24 | Electric wave absorbing material for building electromagnetic compatibility test environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220954887.8U CN217363686U (en) | 2022-04-24 | 2022-04-24 | Electric wave absorbing material for building electromagnetic compatibility test environment |
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| CN217363686U true CN217363686U (en) | 2022-09-02 |
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| CN202220954887.8U Active CN217363686U (en) | 2022-04-24 | 2022-04-24 | Electric wave absorbing material for building electromagnetic compatibility test environment |
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