Curved surface FSS radar cover preparation method based on metal mask plate and thermal spraying technology

Abstract

The invention provides a curved surface FSS radar cover preparation method based on a metal mask plate and a thermal spraying technology. The preparation method comprises a FSS curved surface mask plate; the mask plate comprises a hollow structure matched with a radar cover surface FSS layer in design shape; the inner wall of the mask plate and the surface of a radar cover are the same in shape; when a curved surface FSS radar cover is prepared, the FSS curved surface mask plate covers the surface of the radar cover to form a combination body; the surface of the combination body is sprayed bythermal spraying equipment; and a FSS layer containing a metal material and with an accordant shape is formed on the surface of the radar cover at the hollow part of the mask plate. The method can quickly prepare the FSS layer on the surface of the complicated curved surface radar cover.

Description

technical field [0001] The invention relates to the fields of laser processing and microwave technology, in particular to a method for preparing a curved FSS radome based on a metal mask and thermal spraying technology. Background technique [0002] Traditional radomes are usually made of composite materials based on reinforced fibers such as carbon fibers, glass fibers, alumina fibers, or resin matrices such as epoxy resin, phenolic resin, polyester resin, etc. These materials take into account mechanical properties and are "transparent to electromagnetic waves." ". Therefore, in a complex electromagnetic environment, the internal antenna is susceptible to interference from other electromagnetic signals, affecting the normal operation of the antenna. A material with filtering characteristics is needed to shield the internal antenna from transmitting electromagnetic waves outside the passband. [0003] Frequency Selective Surface (FSS) refers to periodically arranged metal ...

AI Technical Summary

Problems solved by technology

For non-developable surfaces, none of the above methods can be directly applied, and the preparation process is cumbersome

At present, for the preparation of non-developable curved surface FSS, the non-expandable curved surface is partitioned, then unfolded into a plane, and FSS is prepared on the flexible screen, and then the curved surface FSS of the piece is made by thermoforming or compression molding, and finally the flat FSS of the piece is pasted. to the surface of the radome, but this method destroys the conductive continuity of the FSS by fragmenting the FSS, which will have an adverse effect on the wave-transmitting performance of the FSS radome, and the folds and seams formed in the anti-sticking will also cause out-of-band The increase of RCS is not conducive to the passage of electromagnetic waves in its own working frequency band, nor is it conducive to the shielding of out-of-band electromagnetic waves

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