A High-Gain Dual-Band and Dual-Polarized Transmitarray Using Novel Loop Elements

A high-gain dual-band and dual-polarized transmitarray has been designed, fabricated, and measured for Ku-band (12.5/14.25 GHz) satellite communications. The transmitarray unit cell is a combination of two novel loop elements, which are interlaced to form a unit cell for dual-band operation. The transmission response of both interlaced loop elements is almost independent at both frequencies. The three-layer dual-band element achieves 300° phase range in both the frequency bands with less than 2 dB insertion loss. A dual-band transmitarray has been designed by using array theory in each frequency band independently. The measured radiation characteristics of the transmitarray are obtained through a planar near-field measurement setup. The dual-band transmitarray has achieved measured peak gains of 30.2 and 32.3 dBi with aperture efficiencies of 38% and 46% in downlink and uplink frequency bands, respectively.