Wideband Circularly-Polarized Gap Waveguide-Based Antenna Design

This paper presents the design of an all-metal antenna based on Gap Waveguide technology. The antenna, which is realized using a Ridge Gap Waveguide, consists of just two layers, maintaining a compact size. The first layer is made up of two perpendicularly placed arms, which comprise the feeding, and the second layer hosts a diamond shaped slot and a horn, which comprise the radiator. Simulations show that the design achieves a remarkable bandwidth equivalent to the 31.43% of the central frequency in terms of both S<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> parameter, being below -10 dB, and Axial Ratio, being below 3 dB.