A New K-band 1-bit Broadband Reconfigurable Reflectarray Antenna

Metasurface antennas are considered as one of the future 6G communication technologies due to their beamforming ability. We design a K-band beam-controllable reflectarray using a wideband 1-bit reconfigurable metasurface unit. The unit cell provides phase compensation for both states by simultaneous state inversion by two PIN diodes. The 180° reflected phase difference between the two states is achieved by the parallel patch circuit current change, and the wideband comes from the similar resonance frequency. The reflection loss of the K-band component in both states is less than 0.6 dB. The reconfigurable reflectarray antenna excited by the linear polarized horn has the characteristics of low loss, with a maximum gain of approximately 22.6 dBi in the frequency band and frequency coverage of 22–26 GHz.