Impedance frequency select surface

Abstract

The invention provides an impedance frequency select surface. A frequency select surface layer (1) leads in a dielectric spacer layer (2) and a resistance loading layer (3) which are constructed with a dissipative network; the resistance loading layer (3) and the isolation matching layer equivalently and electrically load the network and are in cascade connection with the frequency select surface layer; the frequency select surface layer and the resistance loading layer are attached to the dielectric spacer layer; the frequency select surface layer loads incident wave and electromagnetic wave capacitance and inductance, and leads in reflection loss; the resistance loading layer loads incident wave and electromagnetic wave resistance of the impedance frequency select surface layer; and the dielectric spacer layer is matched with the loaded resistance, the loaded capacitance and the loaded inductance. The impedance frequency select surface leads in the dielectric spacer layer and the resistance loading layer, so that limitation that a stop frequency band of the existing frequency select surface has the total reflection characteristic is eliminated; the stop frequency band is reduced effectively; and the technical problem that an RCS (Radar Cross Section) of the existing frequency select surface radome is limited to the structure shape is solved. The impedance frequency select surface can serve as RCS control of a spatial filter and a radome.

Description

technical field [0001] The invention relates to an impedance type frequency selective surface which is applied in the fields of antenna radar scattering cross section (RCS) control and electromagnetic shielding, and whose wave transmission and reflection characteristics can be comprehensively designed. Compared with the existing frequency selective surface, the impedance type frequency selective surface has better application effect. Background technique [0002] Frequency Select Surface is a single-screen or multi-screen periodic array structure composed of a large number of passive resonant units, which is composed of periodically arranged conductive patch units or periodically arranged aperture units on a conductive screen. This surface can be totally reflective (patch type) or fully transmissive (aperture type) near the cell's resonant frequency. Metal patch arrays arranged periodically along one-dimensional or two-dimensional directions or aperture arrays on metal plane...

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at the deficiencies of the existing frequency selective surface technology, and proposes an impedance type frequency selective surface that can freely design the reflection and transmission coefficients, which can realize the control and reduction of the stop band reflection coefficient, thereby solving the current problem. The frequency-selective surface is limited by technical problems such as the structure and shape of the cover in the application of the stealth radome, and provides a new technical means for achieving a steeper frequency-selective characteristic

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