Single-Layer Sequential Rotation Network in Gap Waveguide for a Wideband Low-Profile Circularly Polarized Array Antenna

[EN] A low-profile circularly-polarized sequential rotation fed 4 x 4 array antenna working in the Ka-band from 27.5 GHz to 31 GHz is presented. The particularity of the antenna lies in its single-layer sequential rotation feed network implemented in a bed of nails using a combination of groove and ridge gap waveguides. The basic radiating element is one slot loaded by a simple coffee-bean-shaped parasitic element on top. Experimental results show an antenna matching below -10 dB in a 13.6% bandwidth and a measured axial ratio below 1.3 dB in the desired band.This work was supported in part by the Ministry of Science and Innovation of the Spanish Government, in part by the Agencia Estatal de Investigacion (AEI) under Project PID2019-107688RB-C22 and Project AEI/10.13039/501100011033, and in part by the University of Alicante under the Research Project GRE20-06-A.Ferrando-Rocher, M.; Herranz Herruzo, JI.; Valero-Nogueira, A.; Bernardo-Clemente, B. (2022). Single-Layer Sequential Rotation Network in Gap Waveguide for a Wideband Low-Profile Circularly Polarized Array Antenna. IEEE Access. 10:62157-62163. https://doi.org/10.1109/ACCESS.2022.318233662157621631