CN216312062U - Broadband pyramid wave-absorbing material - Google Patents
Broadband pyramid wave-absorbing material Download PDFInfo
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- CN216312062U CN216312062U CN202121770130.5U CN202121770130U CN216312062U CN 216312062 U CN216312062 U CN 216312062U CN 202121770130 U CN202121770130 U CN 202121770130U CN 216312062 U CN216312062 U CN 216312062U
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Abstract
The utility model belongs to the technical field of electromagnetic property testing, and relates to a broadband pyramid-shaped wave absorbing material which comprises an electric double layer, an FSS wave absorbing screen, a ferrite layer and a multi-pyramid wave absorbing body, wherein the ferrite layer is arranged on the surface of the FSS wave absorbing screen, the FSS wave absorbing screen is arranged between the ferrite layer and the electric double layer, the multi-pyramid wave absorbing body comprises a bottom layer and a plurality of multi-pyramids which are arranged on the surface of the bottom layer according to a square periodic array, the electric double layer is of a capacitor structure comprising two parallel polar plates, and free metal ions are filled between the two parallel polar plates. The utility model effectively improves the wave-absorbing performance of the wave-absorbing material laid in the darkroom. So that no reflected wave exists indoors as much as possible, and an ideal open test field or free space is simulated more effectively.
Description
Technical Field
The utility model belongs to the technical field of electromagnetic property testing, and relates to a broadband pyramid wave-absorbing material.
Background
Electromagnetic wave absorbing materials are currently used increasingly in a wide variety of applications: on one hand, the wave-absorbing material is applied to various military equipment or shell structures of civil electronic products to control the electromagnetic resonance radiation of equipment or subsystems; on the other hand, the material is used for the walls of a microwave anechoic chamber and an electromagnetic compatibility (EMC) anechoic chamber (hereinafter, referred to as an anechoic chamber) so that no reflected wave exists in the chamber as far as possible to simulate an ideal open test field or free space, and the performance of the electromagnetic wave absorbing material has a crucial influence on the uniformity index of the field in the anechoic chamber.
The existing pyramid-shaped wave-absorbing material laid generally takes polyurethane as a raw material, and the polyurethane pyramid-shaped wave-absorbing material has good wave-absorbing performance above 200MHZ, but has poor wave-absorbing effect in a low-frequency band.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is as follows: the utility model provides a pyramid wave-absorbing material, which can effectively improve the wave-absorbing performance of a polyurethane pyramid wave-absorbing material and realize the wave-absorbing effect of a wide band.
The technical scheme of the utility model is as follows:
the utility model provides a broadband pyramid type absorbing material, includes that electric double layer, FSS inhale ripples screen, ferrite layer and polypyramid inhale the ripples body, the ferrite layer set up and inhale ripples screen surface at FSS, FSS inhale ripples screen setting between ferrite layer and electric double layer, polypyramid inhale the ripples body and include that bottom and a plurality of arrange the polypyramid on the bottom surface according to square period array, the electric double layer be the capacitor structure including two parallel polar plates, two parallel polar plates between be full of free metal ion.
Further, the polygonal pyramid wave absorber is a polyurethane triangular pyramid.
Further, the cone angle a of the multi-pyramid wave absorber is 30-60 degrees.
Further, the height H of the polygonal pyramid is 600mm, and the width L of the bottom of the polygonal pyramid is 125 mm.
Further, the thickness of the bottom layer is 200 mm.
Further, the thickness of the electric double layer is 100 mm.
Furthermore, the two parallel polar plates of the double electric layers are connected with an external voltage applying device.
Furthermore, the FSS wave-absorbing screen is composed of a plurality of FSS arrays arranged according to a square periodic array, a circular hole is formed in the middle of each FSS array, and the width of each FSS array is s.
The utility model has the beneficial effects that:
a wide-band pyramid-type wave-absorbing material is provided, which is a composite wave-absorbing body consisting of four layers of polyurethane pyramid, ferrite, double electric layers and an FSS metal screen. The wave absorbing material wave absorbing body can effectively reduce the height of the pyramid, and the wave absorbing performance can be improved at low frequency, and is stronger than the wave absorbing performance of a pure polyurethane pyramid wave absorbing material. The utility model effectively improves the wave-absorbing performance of the wave-absorbing material laid in the darkroom. So that no reflected wave exists indoors as much as possible, and an ideal open test field or free space is simulated more effectively.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of an FSS wave-absorbing screen;
fig. 3 is a schematic diagram of the wave-absorbing structure and the wave-absorbing performance curve of a single polyurethane pyramid wave-absorbing material.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1, a broadband pyramid-type wave-absorbing material includes an electric double layer 1, an FSS wave-absorbing screen 2, a ferrite layer 3, and a polygonal pyramid wave-absorbing body 4, wherein the ferrite layer 3 is disposed on the surface of the FSS wave-absorbing screen, the FSS wave-absorbing screen 2 is disposed between the ferrite layer 3 and the electric double layer 1, the polygonal pyramid wave-absorbing body 4 includes a bottom layer and a plurality of polygonal pyramids arranged on the surface of the bottom layer according to a square periodic array, the electric double layer 1 is a capacitor structure including two parallel plates, and free metal ions are filled between the two parallel plates. The composite wave absorbing body can effectively reduce the height of the pyramid, can improve the wave absorbing performance at low frequency, and has stronger wave absorbing performance than a pure polyurethane pyramid wave absorbing material. So that no reflected wave exists indoors as much as possible, and an ideal open test field or free space is simulated more effectively.
Example two:
a wide-band pyramid-shaped wave-absorbing material is prepared from four parts: the wave absorbing plate comprises four layers of polyurethane pyramid, a ferrite layer 3, an FSS wave absorbing screen 2 and an electric double layer 1.
The double-layer structure comprises a double electric layer 1, wherein an FSS wave absorbing screen 2 is arranged on the double electric layer 1, a ferrite layer 3 is arranged on the FSS wave absorbing screen 2, and a polyurethane pyramid is arranged on the ferrite layer 3. The length, width and height of the wave-absorbing material are respectively 500mm multiplied by 1000 mm. The height of the cone 1 is 600mm, the thickness of the cone 2 is 200mm, the thickness of the ferrite 3 is 100mm, and the thickness of the electric double layer 1 is 100 mm. The cone angle is 30-60 degrees, and the cone width is 125 mm.
As shown in fig. 2, the FSS wave-absorbing screen 2 is composed of a plurality of FSS arrays arranged in a square periodic array, a circular hole is formed in the middle of each FSS array, and the width of each FSS array is s.
The polyurethane pyramid has good wave absorbing performance above 200 MHZ.
Ferrites have good performance in the frequency range below 4 GHZ.
And a double electric layer is added on the bottom surface of the ferrite, so that the wave absorbing performance can be further improved.
The composite structure can reduce the height of the pyramid, and the wave absorbing performance can be improved at low frequency.
The thickness of the ferrite or the double electric layers can be adjusted to enable the wave-absorbing material to obtain or obtain a plurality of peaks at a certain frequency, or eliminate absorption peaks at certain unwanted frequencies.
As shown in fig. 3, the final test result of the reflectivity performance test of the wave-absorbing material structure is as follows: under vertical polarization, the frequency is 1GHz-18GHz, which is 5-6 dB higher than that of a single polyurethane pyramid wave-absorbing material.
Claims (8)
1. A wide-band pyramid wave-absorbing material is characterized in that: wave-absorbing screen (2), ferrite layer (3) and many pyramids wave-absorbing body (4) are inhaled including electric double layer (1), FSS, ferrite layer (3) set up and inhale wave-absorbing screen (2) surface at FSS, FSS inhale wave-absorbing screen (2) and set up between ferrite layer (3) and electric double layer (1), many pyramids wave-absorbing body (4) include that bottom and a plurality of arrange the many pyramids on the bottom surface according to square period array, electric double layer (1) be the capacitor structure including two parallel polar plates, two parallel polar plates between be full of free metal ion.
2. The broadband pyramid-type wave-absorbing material of claim 1, wherein: the polygonal pyramid wave absorbing body (4) is a polyurethane triangular pyramid.
3. The broadband pyramid-type wave-absorbing material of claim 2, wherein: the cone angle a of the multi-pyramid wave absorbing body (4) is 30-60 degrees.
4. The broadband pyramid-type wave-absorbing material of claim 1, wherein: the height H of the polygonal pyramid is 600mm, and the width L of the bottom of the polygonal pyramid is 125 mm.
5. The broadband pyramid-type wave-absorbing material of claim 1, wherein: the thickness of the bottom layer is 200 mm.
6. The broadband pyramid-type wave-absorbing material of claim 1, wherein: the thickness of the electric double layer (1) is 100 mm.
7. The broadband pyramid-type wave-absorbing material of claim 6, wherein: and the two parallel polar plates of the double electric layers (1) are connected with an external voltage applying device.
8. The broadband pyramid-type wave-absorbing material of claim 1, wherein: the FSS wave-absorbing screen (2) is composed of a plurality of FSS arrays arranged according to a square periodic array, a circular hole is formed in the middle of each FSS array, and the width of each FSS array is s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770130.5U CN216312062U (en) | 2021-07-30 | 2021-07-30 | Broadband pyramid wave-absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770130.5U CN216312062U (en) | 2021-07-30 | 2021-07-30 | Broadband pyramid wave-absorbing material |
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| Publication Number | Publication Date |
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| CN216312062U true CN216312062U (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121770130.5U Active CN216312062U (en) | 2021-07-30 | 2021-07-30 | Broadband pyramid wave-absorbing material |
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| CN (1) | CN216312062U (en) |
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2021
- 2021-07-30 CN CN202121770130.5U patent/CN216312062U/en active Active
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