Wave-absorbing and wave-transmitting integrated frequency selective surface with ultra-wide wave-transmitting band

Abstract

The invention provides a wave-absorbing and wave-transmitting integrated frequency selective surface with an ultra-wide wave-transmitting band. According to the technical schemes, the wave-absorbing and wave-transmitting integrated frequency selective surface with the ultra-wide wave-transmitting band comprises FSS units which are periodically arranged, wherein all the FSS units are the same. EachFSS unit is of a structure comprising three layers, namely a first layer, a second layer and a third layer; the first layer comprises a dielectric plate (1); a metal patch (2) is arranged in the center of the upper surface of the dielectric plate (1); the metal patch (2) is of an N-arm square spiral structure; metal strips (3) are evenly distributed around the metal patch (2); each metal strip (3) is connected with the metal patch (2) through a resistor (4); the second layer is an air interlayer (5); and the third layer is a wave-transmitting layer (6). With the wave-absorbing and wave-transmitting integrated frequency selective surface with the ultra-wide wave-transmitting band of the invention adopted, an ultra-wideband, high-transmittance and high-angle stability wave-transmitting bandcan be realized, and a wave-absorbing characteristic can be generated outside the wave-transmitting band. In addition, the surface of the invention is simple in structure and easy to machine.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic periodic structures, and relates to the design of an integrated FSS (Frequency Selective Surface, Frequency Selective Surface) of wave absorption and wave transmission. Background technique [0002] FSS is an effective means to realize space electromagnetic wave control. It has been widely used in radar and communication systems. FSS with high transmittance can be used as radome and other fields, and FSS with high reflectivity can be used in electromagnetic protection, electromagnetic shielding and other fields. Therefore, designing FSS with various characteristics is an important research and development direction in the microwave field. [0003] FSS with ultra-broadband and high transmittance characteristics is usually applied to the design of stealth radomes. By designing the FSS in the form of a cone, a curved surface, etc., and adopting a conformal method with the antenna, the redu...

AI Technical Summary

Problems solved by technology

The upper resonant structure of the FSS is a single-polarized resonant structure shaped like a "dog bone", forming two orthogonal layouts to achieve polarization-insensitive characteristics. The FSS can achieve good ultra-wideband characteristics, but the angular stability is poor. The passband characteristics fluctuate greatly with the increase of oblique incident angle

In addition, the upper structures of the above two FSSs need to be separately designed for polarization insensitivity, so they are relatively complicated

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