Scattering Mitigation Frequency Selective Surface for Unidirectional Blockage Compensation

This communication describes a concept of scattering mitigation frequency-selective surface (FSS) for unidirectional blockage compensation using a single substrate FSS without modification of the obstacle. The devised scattering mitigation FSS generates the complementary electric field to that of the blockage, enabling the blockage to become electromagnetically transparent to the antenna. Using superposition and linearity, the spatial impedance distribution of the FSS is calculated. The devised FSS consists of indented patch elements consisting of four symmetric via structures to exhibit a wide tunable transmission phase range and less than 1 dB insertion loss at the center frequency of 30.0 GHz for proof-of-concept. The proposed scattering mitigation FSS is verified in transverse magnetic (TMz)- and transverse electric (TEz)-polarized cylinder scattering scenarios. The measurement confirms the improvements of the main beam peak gain and restoration of far-field radiation patterns. The proposed investigation is expected to provide concise and practical scattering reduction solutions for blockage scenario such as vehicular communication in urban areas.