Low-Profile 2D-Mechanical-Beam-Steering Antenna with Large Field-of-View

This contribution presents a compact Risley-based 2D-beam-steering antenna in Ka-band featuring a large Field-of-View (FoV), which is up to 75° steering angle with 360° coverage in azimuth. The antenna presented in this paper is an improved version of our previous work in which the steering capacity was limited to 66° steering angle. The proposed Risley-based antenna is composed of a circularly polarized Radial Line Slot Array (RLSA) and two high-permittivity dielectric deflectors manufactured by 3D-printing. A 28-cm-diameter prototype was assembled with a total height of only 4 cm, corresponding to 3.8 free-space wavelengths at 29 GHz. In this new version, the two deflectors' design are modified to achieve a higher deflection angle, leading to a wider FoV. Simulation and preliminary measurement results show a good agreement, validating the steering capacity of the antenna up to 75° at 29 GHz.