Waveguide 3-D FSSs by 3-D printing technique

摘要: In this paper, two novel bandpass three-dimensional frequency selective surfaces (3-D FSSs) based on the waveguide structure are proposed. The first 3-D FSS is composed of a square metallic with dumbbell slots which loaded in all walls. This design can form slot resonators and introduce passband below cutoff waveguide. second one constituted coaxial unit cells, provides parallel plate paths. By interaction between propagation paths, quasi-elliptic response takes place improves selectivity. results show that both proposed FSSs exhibit dual polarized characteristics, provide good stability for different incidence. addition, using printing technology, these structures easy fabrication.