Tunable frequency selective surface structure

A tunable frequency selective surface (FSS) structure, comprising:

• a dielectric substrate and a rectangle resonant component arranged on the dielectric substrate, wherein
• the rectangle resonant component comprises a plurality of perforated rectangle resonant units arranged in a matrix;
• the perforated rectangle resonant units each comprise two identical rectangle perforated metal patches arranged in a mirror image relation, and a varactor diode arranged between the two rectangle perforated metal patches;
• and
• in the rectangle resonant component, the varactor diodes in the perforated rectangle resonant units in a same row are arranged in a same direction, and the varactor diodes in the perforated rectangle resonant units in adjacent rows are arranged in opposite directions;
• wherein the rectangle perforated metal patches are each provided with a first rectangle hole, a second rectangle bole, and a third rectangle hole;
• and the first rectangle hole and the second rectangle hole are symmetrically arranged on two sides of the third rectangle hole;
• wherein the first rectangle hole comprises two parallel transverse edges and two parallel vertical edges;
• the second rectangle hole comprises two parallel transverse edges and two parallel vertical edges,
• the third rectangle hole comprises two parallel transverse edges and two parallel vertical edges:
• one end of a first transverse edge of the third rectangle hole is connected to one end of a first transverse edge of the first rectangle hole, the other end of the first transverse edge of the third rectangle hole is connected to one end of a first transverse edge of the second rectangle hole and the first transverse edge of the third rectangle hole, the first transverse edge of the first rectangle hole and the first transverse edge of the second rectangle hole are located on a same horizontal line;
• one end of a second transverse edge of the third rectangle hole is connected to one end of a second transverse edge of the first rectangle hole, the other end of the second transverse edge of the third rectangle hole is connected to one end of a second transverse edge of the second rectangle hole, and the second transverse edge of the third rectangle hole, the second transverse edge of the first rectangle hole and the second transverse edge of the second rectangle hole are located on a same horizontal line;
• and
• a first vertical edge of the third rectangle hole and a first vertical edge of the first rectangle hole are the same, and a second vertical edge of the third rectangle hole and a first vertical edge of the second rectangle hole are the same.