A Lower Height-to-Diameter Ratio Risley Prism Beam-Scanning Antenna Based on Additional Phase Compensation Method

With the increasing demand for high integration in satellite communications, the low-profile performance of beam-scanning antennas (BSAs) has become a key factor limiting their applications. To further reduce the profile, a novel compact circularly polarized (CP) folded transmitarray antenna for beam scanning is proposed, leveraging the Risley prism (RP) principle and an additional phase compensation method. The proposed folded transmitarray Risley prism antenna (FTRPA) achieves 2-D CP beam scanning, featuring an extremely low profile and reduced scanning gain attenuation. In addition, the proposed FTRPA was simulated and prototyped. The results demonstrate that it can achieve left-hand CP (LHCP) beam scanning with an elevation angle ranging from 0° to 49°, with a height-to-aperture ratio (H/D ratio) of 0.137 and scan loss of 2.08 dB. The designed antenna, featuring the lower profile, low scan loss and flexible beam-scanning capabilities, holds significant potential for applications in satellite communication.