Multi-Bit Wideband Transmitarray Aperture with Independent Phase and Amplitude Control for High Gain with Low Sidelobe Mm-Wave Applications

In this paper, a multi-bit transmitarray (TA) is proposed, as a system for beam-steering. The full structure is composed of 400 meta-atoms independently adjustable in both phase and amplitude. The far-field beam-steering mechanism of the proposed antenna is achieved by calculating the required phase compensations for each meta-atom, to redirect the beam to a predefined angle, in addition to a multi-bit system for amplitude distribution, for side-lobe level reduction. Simulation results show two unique beam scanning techniques, one for a phase only beam steering system with a maximum peak gain and SLL of 20.1 dBi and -12.3 dB, respectively, and the second one for independent phase/amplitude mechanism, at different angles of 0°, and 30°, and the maximum achieved peak gain and SLL were 25 dBi and -20.4 dB, respectively, making the proposed TA a potential candidate for high-gain and low SLL beam steering mm-wave communication system.