Polarization Independent Triple-Band Frequency Selective Surface Based on Matryoshka Geometry

The development of a polarization independent triple-band frequency selective surface, FSS, is described in this paper. This FSS is achieved combining two geometries, cross-dipoles and matryoshka, which makes it possible to maintain the resonant frequencies of each geometry. Initial design equations are proposed for each geometry, with a very good agreement when compared to numerical and measured results. A prototype was fabricated and characterized numerically and experimentally, considering incidence angles of 0°, 15°, 30° and 45°. When compared to numerical results, experimental results presenting a very good agreement, confirming the triple-band behavior and the polarization independence.