A Novel Electrically Adjustable Frequency Selective Surface Structure

Abstract

A novel electricity-adjustable frequency selective surface structure comprises a dielectric plate, an upper conducting layer and a lower conducting layer, and the upper conducting layer and the lower conducting layer are arranged on the front face and the back face of the dielectric plate. The upper conducting layer is formed by arranging upper period units periodically, the lower conducting layer is formed by arranging lower period units periodically, each upper period unit is composed of upper-layer parallel metal bands on the upper edge and the lower edge, a large metal square block in the center and small metal square blocks on the left edge and the right edge, and the upper-layer parallel metal bands, the large metal square blocks and the small metal square blocks are not connected . The lower period units are composed of lower-layer parallel metal bands on the left edges and the right edges. Variable capacitance diodes are welded around the large metal square blocks respectively, and the positive poles and the negative poles of the upper variable capacitance diodes and the lower variable capacitance diodes are welded to the large metal square blocks and the upper-layer parallel metal bands respectively. The positive poles and the negative poles of the left variable capacitance diodes and the right variable capacitance diodes are welded to the small metal square blocks and the large metal square blocks respectively. The small metal square blocks and the lower-layer parallel metal bands are connected through conductive via holes penetrating through the dielectric plate. The influence of a bias network layer on the frequency selection transmission characteristic is reduced through the metal structure of the frequency selective surface.

Description

technical field [0001] The invention belongs to the field of frequency selective surface design, in particular to a novel electrically adjustable frequency selective surface structure, especially suitable for L, S, C band radars and communication equipment. Background technique [0002] Frequency Selective Surface (FSS) is a periodic array result composed of unit graphics of a specific shape, which can be regarded as an electromagnetic filter structure in an open space, and has band-pass or band-stop characteristics, and is usually used in radar stealth radomes , Sub-reflector of parabolic antenna, etc. [0003] The resonant frequency of a common frequency selective surface is related to the structural size parameters of the periodic unit of the frequency selective surface. For frequency selection of a specific structural size, its passband frequency is often fixed. However, under some special application conditions, the passband frequency of the frequency selective surface...

AI Technical Summary

Problems solved by technology

[0007] 2. Also limited by the voltage bias network, most of the existing voltage-controlled electric adjustable frequency selection surfaces are in a single polarization direction, which cannot meet the needs of multi-polarization electronic equipment

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