Novel three-dimensional frequency selective surface with incident angle and polarization independence

In this paper, a novel three-dimensional frequency selective surface (3D FSS) which is independent of incident angles and polarizations is presented. The periodic unit cell of the proposed 3D FSS is composed of a square metallic waveguide with modified dumbbell slots in all waveguide walls. Frequency transmission characteristics of this 3D FSS for both TE and TM polarizations under different incident angles are simulated. From the results, it is founded that the proposed 3D FSS can provide excellent frequency stability for different incident angles and polarizations. What´s more, using 3D printing technology, the novel 3D FSS will be easy for fabrication.