Polarization and Pattern Reconfigurable Fabry-Perot Cavity Antenna Using PIN Diodes Grid

This work proposes a polarization and directivity reconfigurable Fabry-Perot cavity antenna. The design uses a grid of reconfigurable PIN didoes, with rows and columns of diodes being turned on/off to control the radiating aperture. The cavity is excited using circularly polarized patch antenna. Overall, the antenna can be reconfigured to radiate either that for a pol, which to control polarization and aperture size. The reconfiguration is controlled by switching rows and columns of PIN diodes that form the grid of Polarization Selective Surface PSS). For the linear polarization, the antenna offers 40 dB of cross polarization level, while the beam width can be altered from 20° to 32°. The antenna preserves 10 dB impedance bandwidth for all investigated configurations, with the exception when all diodes are turned on to block the radiation for all polarizations.