Q/V-Band Gap-Waveguide-Based Circularly-Polarized Antenna

This paper presents the design of an all-metal Gap Waveguide-based antenna. The design is intended for satellite communications as it covers the Q/V-Band, comprised between 37.5 and 42.5 GHz and between 47.5 and 52.4 GHz. This antenna operates with circular polarization, featuring an Axial Ratio below 1.5 dB at both frequency bands. The design includes a transition from an standard WR waveguide to a Ridge Gap Waveguide. The simulation of the whole system shows return losses higher than 10 dB at the bands of interest. Furthermore, this unit cell antenna achieves a maximum gain of 11.9 dB at 48.8 GHz.