A Low-Profile and Beam-Steerable Transmitarray Antenna: Design, Fabrication, and Measurement [Antenna Applications Corner]

This article describes the design, fabrication, and measurement of a low-profile and beam-steerable transmitarray (TA) antenna based on ray-folding principles. The proposed TA antenna consists of a planar feeding source, phase-shifting surfaces, and a metal plate as a reflector. The electromagnetic (EM) wave radiating from the planar feeding source would first be reflected by the metal plate and then propagate through the phase-shifting surfaces to achieve a focused beam in a specific direction. In this configuration, the profile of the proposed TA antenna is decreased to half compared with a conventional TA antenna.