Polarization properties of the original Cavity Resonant Antenna are investigated in this abstract. The antenna contains two interconnected volume resonators — a cylindrical resonator with a partially transparent (radiating) flat wall and a coaxial-slot resonator located in it. The main characteristics of the antenna in the main planes are given. It is shown that the level of cross-polarization radiation does not exceed minus 50 dB within the main pattern lobe.
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