Three-screen double-passband high-selectivity frequency selective surface and design method thereof

Abstract

The invention discloses a three-screen double-passband high-selectivity frequency selective surface and a design method thereof. The frequency selective surface comprises a first metal patch layer, a first dielectric layer, a second metal patch layer, a second dielectric layer and a third metal patch layer which are sequentially pressed together; the first metal patch layer and the third metal patch layer are both composed of a first square loop and a second square loop, the first square loop is larger than the second square loop, the two loops are nested, and a gap exists between the two loops. The second metal patch layer is composed of a third square loop and a fourth square loop, the third square loop is larger than the fourth square loop, the two loops are nested, and a gap exists between the two loops. High-order resonance is achieved in a multi-screen cascade mode, sideband roll-off is accelerated while low insertion loss is guaranteed, multiple transmission zeros are obtained outside a passband through the multi-loop resonance design, stopband bandwidth is superposed, the suppression is improved, and therefore the structure obtains the high selection characteristic. And electromagnetic waves with different frequencies can be efficiently and accurately separated in a complex environment.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic fields and microwaves, and in particular relates to a three-screen double-passband high-selectivity frequency selective surface and a design method thereof. Background technique [0002] Frequency Selective Surface (FSS) is a two-dimensional periodic array structure, which has the ability to control the passage or reflection of electromagnetic waves, and has extremely high application value in the fields of airborne antenna stealth and wireless communication. FSS is essentially a spatial filter that has selective filtering properties for incident electromagnetic waves and can be designed to transmit or reflect electromagnetic fields only within a given frequency range. Different from ordinary radio frequency filters, the frequency selective surface filters electromagnetic waves in space, and the situation that needs to be considered is more complicated. Its frequency response depends not o...

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Problems solved by technology

[0006] In view of the deficiencies in the prior art above, the purpose of the present invention is to provide a frequency selective surface with three screens and double passbands with high selectivity and its design method, so as to solve the problem of insufficient frequency resolution of the existing frequency selective surface

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