Ultra-wide passband frequency selective surface capable of improving angle stability and design method thereof

Abstract

The invention discloses an ultra-wide passband frequency selective surface capable of improving angle stability and a design method thereof. The frequency selective surface is formed by five layers: a first metal patch layer, a first intermediate medium layer, a second metal patch layer, a second intermediate medium layer and a third metal patch layer, which are laminated in sequence. The ultra-wide passband frequency selective surface ensures that a frequency selection structure has super-wide passband characteristics, and meanwhile, has stable performance under the condition of large-angle incidence; the frequency selection structure can be combined with the majority of thickness of skins, housings and protective covers and the like freely; and the ultra-wide passband frequency selective surface has a very high practical value.

Description

technical field [0001] The invention belongs to the field of electromagnetic field and microwave technology, and specifically refers to an ultra-wide passband frequency selective surface with angular stability and a design method thereof. Background technique [0002] A frequency selective surface (FSS) is a periodic structure composed of metal patches arranged regularly on a dielectric layer. When the frequency of the incident electromagnetic wave is at the resonant frequency of the frequency selective surface unit, the FSS exhibits total reflection (patch type) or total transmission (aperture type), and electromagnetic waves of other frequencies can pass through the FSS (patch type) or be totally reflected (aperture type), so FSS is essentially a special spatial filter that can effectively control the transmission characteristics of electromagnetic waves. By applying the FSS technology to the radome, the radome can obtain the function of frequency selection and perform fr...

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Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide an ultra-wide passband frequency selective surface with improved angular stability and its design method, so as to solve the problem that the frequency selective surface in the prior art cannot be well used for the stealth of the aircraft. The present invention ensures that the frequency-selective structure has ultra-wide passband characteristics, and can be freely combined with structures such as skins, shells, and protective covers with most thicknesses, so as to exert its unique electrical properties

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