Method for manufacturing wave-absorber of resonant group with hole-closing structure

Abstract

Belonging to interleaving techniques area of materials science and microwave technology, the invention is related to high performance absorber of absorbing electromagnetic wave in microwave dark room (no echo dark room) possessing of absorbing wave bodies in resonance group in closed cell structure. Character is that hollow ball (made from organic or non organic of wave pervious materials). Electric and magnetic layer coated on surface of hollow ball constitute electric wall and magnetic wall. Thousands the hollow balls are enclosed in plastic case so as to form absorbing wave bodies in resonance group. Features are: favorable function of damp proof and waterproof, no fluctuation of electromagnetic performance under different humidity. Comparing with foam plastics, the invention possesses advantages: strong plastic case, larger electromagnetic loss caused by multiple oscillations in resonance balls.

Description

technical field [0001] The invention belongs to the cross technical field of material science and microwave technology, and relates to the manufacturing surface technology of resonant cavity and composite material manufacturing technology. In particular, it relates to a manufacturing method of a resonant group absorber with a closed cell structure. Background technique [0002] Absorbing materials refer to a class of functional materials that can absorb and attenuate incident electromagnetic waves, convert their electromagnetic energy into heat energy and dissipate them or make electromagnetic waves disappear due to interference. In the microwave anechoic chamber, various absorbing materials undertake the task of absorbing electromagnetic waves. The absorbers in the darkroom are distributed on the five walls and the ground in the room. The absorbers are mostly cones with a height ranging from 300 to 2400mm. The cones of the main absorbing screen and the secondary absorbing ...

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Problems solved by technology

Since the three-dimensionally distributed absorbers occupy a large amount of test space, the test environment becomes very narrow; secondly, the tall absorbers made of foam plastic are easy to bend and deform, which makes the absorbing effect worse; in addition, The foam absorber has an open-cell structure, which is very easy to absorb water in wet and rainy seasons, making the electromagnetic characteristics unstable, which will cause a lot of errors in GPS positioning and aerospace-related antennas and invisible materials.