Preparation method and application of a flexible resistive film frequency selective surface

Abstract

The invention belongs to the field of flexible FSS radar wave-absorbing structures, and more particularly to a flexible resistive film frequency selective surface, a preparation method and application thereof. The method comprises the steps of: printing a set frequency selective surface pattern on a photosensitive film, and attaching the photosensitive film to the surface of a flexible dielectric substrate; successively exposing and developing the photosensitive film on which the frequency selective surface pattern is printed in order to expose the frequency selective surface pattern on the surface of the flexible dielectric substrate; coating the surface of the developed flexible dielectric substrate with resistive conductive carbon paste, and sintering and curing the flexible dielectric substrate coated with the conductive carbon paste, wherein the cured conductive carbon paste is a resistive film; demolding the cured flexible dielectric substrate, removing the photosensitive film and the resistive film on the surface of the flexible dielectric substrate to obtain the flexible resistive film frequency selective surface. The FSS surface preparation method of the invention is simple, and can produce a large-area flexible passive resistive film frequency selective surface applied to a curved surface.

Description

technical field [0001] The invention belongs to the field of flexible FSS radar wave-absorbing structures, and more specifically relates to a preparation method and application of a flexible resistive film frequency selective surface. Background technique [0002] Frequency Selective Surface (FSS: Frequency Selective Surface) is a device with periodic results, which can selectively reflect, absorb or transmit incident electromagnetic waves. Structurally speaking, FSS is divided into patch type and aperture type, which exhibit band-stop and band-pass characteristics for electromagnetic waves, respectively. FSS is widely used in the microwave field because of its selective properties for incident electromagnetic waves. [0003] In the field of electromagnetic wave absorption technology, the new wave absorbing structure based on FSS can realize broadband absorption and effectively absorb electromagnetic wave energy. In the field of electromagnetic shielding, mobile phones wil...

AI Technical Summary

Problems solved by technology

[0004] The traditional FSS manufacturing process is completed by engraving with an engraving machine, which requires the thickness of the copper clad laminate substrate, otherwise there will be the possibility of being drilled through, which limits the flexibility requirements of FSS; The size of the progress path is closely related, and it is often difficult to meet the target requirements; the operation layout of the engraving machine is limited, which limits the size of the FSS; the engraving speed of the engraving machine is slow, and it is often only possible to complete a piece of FSS with a size of 500mm*500mm in one day

[0005] FSS patterns are generally made by processing copper clad laminates (FR4, PTFE, etc.), and then electronic components need to be welded on the copper flexible frequency selective surface. The process is complicated and the cycle is long

In actual application, there is often a curved surface environment. At present, the production of flexible FSS is limited to a small area, and the application range is limited, such as the application on the cylindrical antenna of the communication system.

And the traditional copper frequency selective surface is prone to wrinkle and seam problems

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