A frequency selective surface with three screens and two passbands with high selectivity and its design method

Abstract

The invention discloses a three-screen dual-passband high-selectivity frequency selection surface and a design method thereof. The frequency selection surface comprises: a first metal patch layer, a first medium layer, a second metal patch layer, and a second medium layer and the third metal patch layer, and press them together in sequence; the first and third metal patch layers are composed of first and second square loops, the first square loop is larger than the second square loop, The two loops are nested, and there is a gap between them; the second metal patch layer is composed of third and four square loops, the third square loop is larger than the fourth square loop, the two loops are nested, and There is a gap between the two. The invention realizes high-order resonance by means of multi-screen cascading, accelerates sideband roll-off while ensuring low insertion loss, obtains multiple transmission zero points outside the passband through multi-loop resonance design, superimposes stopband bandwidth and improves suppression , so that the structure can obtain high selectivity characteristics, and can efficiently and accurately separate electromagnetic waves of different frequencies in complex environments.

Description

Technical field [0001] The present invention belongs to the field of electromagnetic field and microwave technology, specifically relates to a three-screen dual-pass band highly selective frequency selection surface and design method thereof. Background [0002] Frequency Selective Surface (FSS) is a two-dimensional periodic array structure with the ability to control the passage or reflection of electromagnetic waves, and has high application value in the field of airborne antenna stealth and wireless communication. FSS is essentially a spatial filter with selective filtering of incident electromagnetic waves that can be designed to transmit or reflect electromagnetic fields only within a given frequency range. Different from ordinary RF filters, the frequency selection of electromagnetic waves in the surface filter space, the need to consider the situation is more complex, its frequency response not only depends on the unit form of the periodic structure and the operating frequ...

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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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