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 ÷ 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.