Arbitrarily-polarized anechoic chamber wave-absorbing material and preparation method thereof

A microwave absorbing material and microwave anechoic chamber technology, which is used in measurement devices, instruments, electrical components, etc., can solve the problems of inability to accurately grasp the performance of the antenna and the decline in measurement accuracy, so as to improve the measurement accuracy, reduce the measurement error, and reduce the effect of error

Active Publication Date: 2020-05-15
西安安聚德纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the reflectivity is extremely low, the measurement accuracy caused by cross-polarization and rotating polarization is limited, but when the reflectivity is high, the impact on measurement error is very obvious, especially for the test of dual-polarized antennas with high isolation performance. performance may not be accurately grasped

Method used

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  • Arbitrarily-polarized anechoic chamber wave-absorbing material and preparation method thereof
  • Arbitrarily-polarized anechoic chamber wave-absorbing material and preparation method thereof
  • Arbitrarily-polarized anechoic chamber wave-absorbing material and preparation method thereof

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preparation example Construction

[0037] The embodiment of the present invention also provides a method for preparing a microwave anechoic chamber absorbing material with arbitrary polarization, including the following steps S1-S8:

[0038] S1. Using electromagnetic simulation software to select the base material and honeycomb structure characteristics of the arbitrary polarization microwave anechoic chamber absorbing material by optimizing the design and material selection of the special-shaped honeycomb structure;

[0039] S2. Production of conductive coatings;

[0040] S3. Spraying or dipping a conductive coating on the substrate, and drying and curing the conductive coating, so that the surface of the substrate is covered with a conductive coating;

[0041] S4. Spraying or dipping a protective coating on the conductive coating, and drying and curing the protective coating, so that the surface of the substrate is covered with a protective coating;

[0042] S5. Cutting the substrate coated with the conductive...

Embodiment 1

[0096] Example 1: 350mm high 3GHz arbitrary polarization inter-embedded wave-absorbing honeycomb

[0097] This embodiment uses a surface density of 100g / m2 Flame-retardant non-woven fabric as the base material, and 13m2 of non-woven fabric is required to produce 1m2 wave-absorbing honeycomb material, such as Figure 12 As shown, a 50mm diameter semicircle wave A is used to form a 100x100mm quadrilateral wave absorbing unit, and a sharp cone cross B is embedded in it. The upper part of the semicircle wave forms a table shape to reduce the reflection of the honeycomb surface. One of the simulation optimization schemes is that the upper side of the semicircular table is 25mm (d1), the height is 75mm (l1), the tip width of the flat cone is 5mm (d3), and the height is 150mm (l2). The square resistance of the semicircular wave surface is 200 ohms, and the surface square resistance of the tapered plate is 350 ohms.

[0098] Graphene conductive coating formula: 6% graphene (graphite ...

Embodiment 2

[0102] Example 2: 450mm high 2GHz arbitrary polarization inter-embedded wave-absorbing honeycomb

[0103] The surface density used in this embodiment is 120g / m 2 Flame-retardant non-woven fabric is used as the base material, which requires 20m 2 Production of non-woven fabrics 1m 2 Absorbing honeycomb materials, such as Figure 11 As shown, a 50mm diameter semicircle wave is used to form a 100x100mm quadrilateral wave absorbing unit, and a pointed cone cross B is embedded in it. The upper part of the semicircle wave forms a table shape to reduce the reflection of the honeycomb surface. One of the simulation optimization schemes is that the upper side of the semicircular table is 25mm (d1), the height is 100mm (l1), the tip width of the flat cone is 5mm (d3), and the height is 200mm (l2). The square resistance of the semicircular wave surface is 200 ohms, and the surface square resistance of the tapered plate is 300 ohms.

[0104] Graphene conductive coating formula: same a...

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Abstract

The embodiment of the invention provides a broadband arbitrarily-polarized microwave absorbing material and a preparation method thereof. The structure of the arbitrarily-polarized anechoic chamber wave-absorbing material is characterized in that a square honeycomb periodic structure is formed by mutually embedding the wave plates which have the same wave absorbing capacity for the electromagneticwaves of any polarization; the surface of the arbitrarily-polarized anechoic chamber wave-absorbing material is coated with a conductive coating, and the wave-absorbing bandwidth range of the randomly polarized anechoic chamber wave-absorbing material is 0.1-110GHz. When the anechoic chamber wave-absorbing material provided by the embodiment of the invention is used as a wave-absorbing material for an antenna testing anechoic chamber, the testing and measuring precision can be improved, and errors during antenna polarization performance testing are reduced.

Description

technical field [0001] The invention belongs to the field of microwave absorbing materials, in particular to a broadband and arbitrary polarization microwave absorbing material and a preparation method. Background technique [0002] The absorbing performance of sharp cone and wedge absorbing materials used in anechoic chambers for waves with different incident angles and polarizations is different, resulting in cross-polarization and rotational polarization, resulting in a decrease in measurement accuracy, especially It is caused by the increase of the error in the antenna polarization performance test. Taking the absorbing cone as an example, the reflectivity is the same only when the electric field is parallel to the surface of the cone and at an angle of 45° at normal incidence, and the reflectivity at other incident angles, electric field directions and polarization is different in the X and Y directions . Similarly, non-woven fabrics and honeycomb-type absorbing mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00G01R29/08
CPCG01R29/0821H05K9/0081
Inventor 寇亚虎张旭
Owner 西安安聚德纳米科技有限公司
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