  A tunable, polarization sensitive microwave filter based on a reconfigurable
dual-layered two-dimensional metallic photonic crystal is presented. The filter
consists of a metallic plate with periodic holes and metal pillars which are
anchored in a substrate material. The diameter of the pillars is smaller than
that of the holes and the lateral position of the pillars with respect to the
holes is tunable. We study the transmission of the device for linearly
polarized electromagnetic radiation, which is polarized parallel and
perpendicular to the displacement of the movable membrane, respectively. The
tuning range spans from 20.18 GHz to 26.58 GHz for perpendicular polarization
and from 20.18 GHz to 18.42 GHz for parallel polarization. The 3 dB operation
bandwidth varies between 3.82 GHz and 6.44 GHz for perpendicular polarization
and between 3.42 GHz and 3.82 GHz for parallel polarization. Experimental data
are in good agreement with finite element method (FEM) simulations.
