Dual-Linear Polarized 2-bit Reconfigurable Transmitarray at Ku-Band

This communication proposes a dual-linear polarized 2-bit reconfigurable transmitarray (DLPRTA) operating at Ku-band. The independent dual-linear polarization unit cell consists of two mutually orthogonal subunit cells with identical structures. The subunit cell is a receiver–transmitter structure, which is composed of an active symmetrical receiving dipole and an active asymmetric transmitting dipole, respectively, integrated with a pair of p-i-n diodes. A total of four p-i-n diodes of each subunit cell realize four operating states of the 2-bit phase quantization. A DLPRTA prototype consisting of 22 × 22 unit cells was designed, fabricated, and measured. At 15.2 GHz, the maximum gains of the DLPRTA in x- and y-polarization are 24.65 and 24.61 dBi, respectively, corresponding to the aperture efficiency (AE) of 23.85% and 23.59%. Its beam scanning capability has also been verified to cover the scan range of ±50° in both linear polarizations with sidelobe levels (SLL) lower than 10 dB. The gain loss of the maximum angle beam scanning are 2.26 and 2.37 dB, respectively, which proved good beam scanning performance.