Dual Linear Polarization Waveguide Feed Alternatives for Fabry-Pérot Cavity Antennas

Two different alternatives of a dual polarization feeder for Fabry-Pérot cavity antennas are discussed. They are based on a cavity baked double slot antenna fed by waveguides running in different directions, so that the double polarization is obtained. Their performance has been found to be similar in terms of return loss and radiation performance.