Millimeter-wave Scattering Mitigation Transmitarray for Unidirectional Cloaking of Obstacles

This paper presents a new concept of unidirectional scattering mitigation transmitarray (TA) using a single substrate frequency selective surface (FSS). This engineered electromagnetic surface formulates complementary fields for rendering obstacles to become electromagnetically-transparent without blockage modification. Spatial impedance distribution of the proposed TA is calculated by superposition and linearity. A double-layer FSS, which features wide tunable transmission phase shift range within 1-dB transmission loss, is implemented for proof-of-concept demonstration. The proposed cloaking technique is confirmed by full-wave simulations and measurements at 30.0 GHz.