Aperture multi-layer structure-based high-out-of-band rejection frequency selective material design method

Abstract

The invention discloses an aperture multi-layer structure-based high-out-of-band rejection frequency selective material design method. The method includes the following steps that: (1) a frequency selective material is designed based on an aperture multi-layer structure, wherein the aperture multi-layer structure includes three layers of structures, namely, a top-layer patch, a bottom-layer patch and a middle coupled aperture layer; (2) an out-of-band transmission null characteristic is realized through constructing a design method of patch displacement of the top-layer patch and the bottom-layer patch, and the side band cut-off characteristic of the aperture multi-layer structure-based frequency selective material can be further improved; and (3) a unit interdigital technology is adopted to carry out miniaturization processing on the surface of the frequency selective material, so that the unit size of the surface of the frequency selective material can be decreased. With the method of the invention adopted, a high-order coupling characteristic is realized, and the side band cut-off performance of the frequency selective material can be improved; and the unit interdigital method is adopted, so that the unit size of the surface of the frequency selective material can be decreased, and angle stability under the incoming of electromagnetic waves can be improved; and the out-of-band rejection ability of the frequency selective material is stronger, and the pass-band edge rise performance and sharp drop performance of the frequency selective material are better.

Description

technical field [0001] The invention belongs to the field of electromagnetic material research, takes the application trend of frequency-selective material radome as background, and specifically relates to a design method of frequency-selective material with high out-of-band suppression based on aperture multilayer structure. Background technique [0002] Frequency Selective Surface (FSS) is an infinite planar structure composed of the same patch or aperture unit arranged in two-dimensional periodicity. It has frequency selection for electromagnetic waves with different operating frequencies, polarization states and incident angles. characteristic. According to the different frequency responses to electromagnetic waves, the frequency selective surface can be roughly divided into two types: one is the metal patch type, and the other is the aperture type complementary to the patch type structure, that is, slots (slits) on the metal plate Structure. When the frequency selecti...

AI Technical Summary

Problems solved by technology

However, the first-order filtering characteristics of the traditional band-pass frequency-selective surface obviously cannot meet such requirements. Therefore, there is an urgent need for engineering applications to study the design method for improving the out-of-band rejection of frequency-selective materials.

[0004] Retrieving domestic and foreign literature, the design method of high out-of-band suppression for FSS materials is still blank

Images