Dual-passband frequency-selective surface based on high-dielectric and low-loss all-dielectric metamaterial

Abstract

The invention discloses a double-passband frequency selective surface based on high-dielectric and low-loss all-dielectric metamaterials, which includes a double-layer microwave ceramic structure and an air layer sandwiched between the double-layer microwave ceramic structures. The microwave ceramic structure is composed of an etched cross The microwave ceramic substrate with a flower-shaped aperture structure is composed of a cylindrical dielectric resonator. The cylindrical dielectric resonator is installed in the center of the cross-shaped aperture structure. The thickness of the cylindrical dielectric resonator is the same as that of the microwave ceramic substrate. The microwave ceramic substrate is made of high-dielectric Low-loss microwave ceramic materials, the open periodic unit is a cross-shaped aperture structure, and the bandpass characteristics of FSS can be expanded and optimized by adjusting the radius of the dielectric resonator in the center of the unit structure. The invention adopts the design of all-dielectric microwave ceramics, does not contain any metal materials, has the advantages of low loss, high power capacity and high temperature resistance; it can realize the gating characteristics of dual frequency bands in the Ku band, and has polarization insensitivity and good angular stability.

Description

technical field [0001] The invention relates to the technical field of microwave spatial filtering of all-dielectric metamaterials, in particular to a dual-passband frequency selective surface based on high-dielectric and low-loss all-dielectric metamaterials. Background technique [0002] Frequency Selective Surface (FSS) is a kind of spatial filter, which is a planar or curved surface array composed of periodically arranged scatterers, and exhibits one or more bandpass and bandstop characteristics for electromagnetic waves. The traditional frequency selective surface is a two-dimensional periodic structure composed of periodically arranged metal patch units or slot units. It is widely used in radar radomes and reflectors in microwave, infrared and other frequency bands because of its specific frequency selective characteristics. noodle. Metamaterials refer to some artificial composite structures or composite materials with extraordinary physical properties that natural ma...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing metamaterials and frequency-selective surfaces are composed of metal-structured periodic materials. Although metal-based metamaterials have their unique advantages, such as easy design and fabrication, and good compatibility with existing microwave electronic engineering processes, they also have certain Inherent disadvantages, such as not easy to extend to the micro-nano scale range, very sensitive to the parameter changes of the metal structure, high loss, strong anisotropy, etc.

Due to the limitations of the physical properties of metal materials, metal-based metamaterials are not good enough in terms of high temperature resistance and corrosion resistance, and cannot meet the needs of aviation, military and other high-tech indicators.

Images