A Dual-Polarization Slotted Waveguide Array Antenna With Polarization-Tracking Capability and Reduced Sidelobe Level

This communication presents an innovative dualpolarization antenna working at Ku band (14 divided by 14.5 GHz) based on slotted waveguide array (SWGA) technology. The proposed solution allows to simultaneously generate two orthogonal circular polarizations that are combined to generate two orthogonal linear polarizations with polarization-tracking capabilities and very low cross-polarization level thanks to the symmetry of the structure. The antenna is composed of two interleaved slotted ridge waveguide arrays connected to a polarizer, realized with an array of triangular-base ridged cavities. Slots, located at the waveguide centerline, are excited by means of posts avoiding offsets and leading to a regular grid arrangement. Radiating elements are placed in a triangular lattice to minimize the azimuth sidelobe level and provide high EIRP levels.