Liquid crystal-based adjustable band-stop broadband frequency selective surface structure

The invention discloses a liquid crystal-based adjustable band-stop broadband frequency selective surface structure and belongs to the technical field of microwave filtering. An existing band-stop frequency selective surface only has a band-stop filtering characteristic for electromagnetic waves of a certain frequency band, so that the stop-band frequency is fixed and invariable, and the high-reflection-coefficient stop band width of the existing band-stop frequency selection surface is not ideal. With the liquid crystal-based adjustable band-stop broadband frequency selective surface structure of the invention adopted, the above problem can be solved. The liquid crystal-based adjustable band-stop broadband frequency selective surface structure is composed of M*N periodically distributed units; each unit is formed by stacking a first dielectric layer, a first metal layer, a second dielectric layer, a second metal layer and a third dielectric layer in sequence from top to bottom. According to the frequency sel