Double-stop-band frequency selective surface structure with high resonance ratio and unit structure

Abstract

The invention discloses a high-resonance-ratio double-stop-band frequency selective surface structure and unit structure, which belong to the technical field of electromagnetic waves and are characterized by comprising a metal layer and a dielectric substrate, the metal layer is provided with a square annular patch and a diamond ring combined patch; the center of the diamond ring combined patch coincides with the center of the metal layer; the rhombic ring combined patch is formed by sequentially rotating rhombic ring-shaped patches around the center of the structure by 45 degrees and combining the rhombic ring-shaped patches; and the square ring-shaped patch is arranged around the periphery of the rhombic ring combined patch. The structure is small in size, and the requirement for miniaturization of the device can be met; the polarization stability is very good, the resonant frequency deviation belongs to an acceptable range when TE and TM polarized incident waves irradiate, and the characteristic of high resonance ratio is always achieved; and meanwhile, the antenna has very good angle stability, and in TE and TM modes, when incident waves are irradiated at different angles, the first resonant frequency deviation always has a high resonance ratio characteristic within an acceptable range.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave technology, and in particular relates to a high resonance ratio double stopband frequency selection surface structure and a unit structure. Background technique [0002] Frequency Selective Surface (FSS) is a passive two-dimensional array periodic structure, which has a selective effect on electromagnetic waves. Based on its structural design, it can reflect or transmit electromagnetic waves of specific frequencies. The general frequency selective surface structure can be divided into patch type and slot type. The patch type exhibits band-stop characteristics, and the slot type exhibits band-pass characteristics. Based on the unique filtering properties of frequency-selective surfaces, it has become a research hotspot and has been widely used in antennas, metamaterials, microwave device design and other fields. [0003] The disadvantage of the existing frequency selection surface is that it ha...

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Problems solved by technology

[0003] The disadvantage of the existing frequency selection surface is that it has a single filtering frequency band and poor filtering characteristics, which cannot meet the requirements of more scenarios and higher performance. In addition, it cannot be adapted to dual-band devices with a large frequency span. The main performance In terms of poor structural stability, structural design cannot achieve high resonance ratio, etc., and the size of the existing frequency-selective surface structure unit is large, and the overall thickness of the structure is relatively high, which can no longer meet the urgent needs of the current pursuit of miniaturized structures.

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