Design, Equivalent Circuit Analysis, and Verification of A 400-Cell Broadband Dual-Polarized Reconfigurable Transmit-Array at Ka-Band

A broadband 1-bit reconfigurable transmit-array (TA) featuring independent dual-polarized beam-scanning capability is reported at Ka-band. Bandwidth enhanced transmissive elements based on the current reversed mechanism are developed, which are optimized based on an equivalent circuit model. The elements are further miniaturized and aligned orthogonally in an end-to-middle scheme for dual-polarized operation. A 20 × 20-cell dual-polarized reconfigurable TA is fabricated and measured. The prototype exhibits a peak gain of 24.8 dBi, a 3-dB gain bandwidth of 18%, as well as an aperture efficiency of 26%. Moreover, it supports sum beams scanning up to 60° and difference beams steering up to 50°. The demonstrated dual-polarized reconfigurable TA can be a promising candidate for millimeter-wave communication and radar systems.