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

Abstract

The invention discloses a double-passband frequency selective surface based on a high-dielectric low-loss all-dielectric metamaterial. The double-passband frequency selective surface comprises two layers of microwave ceramic structures and an air layer clamped between the two layers of microwave ceramic structures. Each microwave ceramic structure is composed of a microwave ceramic substrate of an etched cross-shaped flower-type pore structure and a cylindrical dielectric resonator, wherein the cylindrical dielectric resonator is installed in the center of the cross-shaped flower-type pore structure, and 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. A pore opening period unit is of a cross-shaped flower-type pore structure, and the band-pass characteristics of the FSS can be expanded and optimized by adjusting the dielectric resonator in the center of the unit structure. By the adoption of the all-dielectric microwave ceramic design, the double-passband frequency selective surface contains no metal materials and has the advantages of being low in loss, high in power capacity, resistant to high temperature and the like; the dual-band gating characteristics within the Ku wave band can be achieved, and the double-passband frequency selective surface has the polarization insensitivity and the good angle 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 for short) 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 ...

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.

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