Three-frequency bad high-performance frequency selection surface based on adjacent unit micro interference

Abstract

The invention relates to a selection surface for three-band high performance frequency based on adjacent unit perturbance. The traditional selection surface has low selectivity, bad performance stability, as well as large volume. Two sides of a medium substrate of the invention are plated with metal layers, the whole medium substrate is opened with multiple groups of metal through holes arranged as squares with different sizes, so as to form multiple groups of integrated waveguide cavities with adjacent high-frequency and low-frequency substrates. An upper metal layer and a lower metal layer of the corresponding cavity are etched with square annular gaps with same high-frequency and low-frequency; compared with the common dual frequency band frequency selection surface composed by two periodic patches or gaps with different sizes, because the new structure introduces the cavity resonance mode, thereby realizing the characteristic of single side sudden drop of pass-band, and greatly improving the selection characteristic of pass-band, meanwhile, conveniently realizing the selection surface of multi pass-band frequencies with ultra-narrow frequency intervals, and the performance has good stability to incident wave angle and polarizability.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a three-band high-performance frequency selective surface based on the perturbation of adjacent units based on substrate integrated waveguide technology, which can be used as a frequency band multiplexer and is widely used in satellite communications and weapon platform radars and other wireless communication system applications. Background technique [0002] Frequency selective surfaces (FSS) are widely used in engineering applications. FSS has good selectivity for the transmission and reflection of electromagnetic waves. It has all-pass characteristics for electromagnetic waves in its passband, and total reflection characteristics for electromagnetic waves in its stopband. It has a spatial filtering function. In the microwave field, FSS can be used in the frequency band multiplexer of the communication satellite system, and the communication capacity can be expanded by using ...

AI Technical Summary

Problems solved by technology

However, these implementation methods have different degrees of defects, such as poor selection characteristics, complex structures that are difficult to design, high manufacturing costs, or geometric structures that cannot correspond to clear physical meanings, so that rapid and effective design cannot be carried out.

Especially for multi-passband applications with narrow frequency band spacing, traditional methods are difficult to achieve

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