A Wideband GaAs Phase-Reconfigurable Reflector for K-Band Reflectarray Antenna

This letter presents a wideband phase-reconfigurable reflector (PRR) for a reconfigurable reflectarray antenna (RRA) in K-band, which is implemented in a 0.15-μm GaAs pHEMT process. The proposed PRR consists of a series resonant network and a series-parallel resonant network, which are composed of three pHEMT switches, inductors, and capacitors. By using 0/-5-V voltage to control the on/off of three pHEMT switches separately, different circuit states can be formed. Constructing mappings between different circuit states and the required phase shifts can achieve a phase shift of 0°-360° in 90° steps while effectively reducing reflection losses (RLs) and improving bandwidth. The experimental results show that in the 20-27-GHz bandwidth, with phase shift errors (PEs) of each phase shift state less than ±15°, the RLs of all states are less than 2.35 dB, and the percentage bandwidth can reach 30%. To the best of our knowledge, this PRR achieves the maximum bandwidth among the published 90° step PRR.