A 2.5d Multilayer Frequency Selective Surface

Abstract

The invention discloses a 2.5D multi-layer frequency selection surface, which comprises a multi-layer strip lumped resistance wave-absorbing layer, an air layer and a metal reflection layer stacked in sequence from top to bottom. The absorption layer includes a first dielectric plate, a second Two dielectric boards, the first FSS layer, the second FSS layer and the third FSS layer, the first dielectric board and the second dielectric board are laminated, the first dielectric board is located on the second dielectric board, and the first FSS layer is located on the second dielectric board. The upper surface of a dielectric plate, the second FSS layer is located on the lower surface of the first dielectric plate, and the third FSS layer is located on the lower surface of the second dielectric plate. The present invention can effectively ensure the strong reflection characteristic higher than -1dB in the band, and has high stability.

Description

technical field [0001] The invention relates to the technical field of electromagnetic periodic structures in electromagnetic field and microwave technology, in particular to a 2.5D multi-layer frequency selective surface. Background technique [0002] With the rapid development of military science and technology, many weapon systems with electromagnetic stealth have appeared. For modern military warfare, the stealth performance directly determines the combat performance of the weapon system. In today's evaluation of stealth performance, the main indicator is the Radar Cross Section (RCS). Taking radar as an example, the radar front part is the main scattering source, that is, the main factor affecting RCS. In recent years, high-gain antennas have received more and more attention, such as reflector antennas, array antennas, and so on. However, due to the simple structure and no energy loss, it usually produces strong reflections outside the band, which greatly increases th...

AI Technical Summary

Problems solved by technology

[0004] In the published patents and literatures, most of them are studying the frequency selective surface of the integration of absorption and transmission. Due to the mutual restriction of the characteristics of the upper absorbing layer circuit and the lower layer bandpass circuit, the absorption frequency band and the transmission frequency band are narrow. And the thickness is thick, which cannot meet the requirements of modern radar for broadband

In addition, the upper absorbing layer of the existing structure is a single-layer structure, which has problems such as single structure and difficulty in realizing dual polarization.

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