Matching of X-shaped waveguide-slot radiators of circular polarization using dielectric inserts in the waveguide

The possibility of obtaining optimal energy and polarization characteristics of X-shaped waveguide-slot radiators cut through either in the wide wall of a rectangular waveguide or in its end wall is investigated. Tuning the system is done at the resonant frequency using dielectric inserts in the waveguide. Dielectric inserts in the first case play the role of matching elements at the input and the complex load at the output of the waveguide, in the second case they are used for the best matching the whole waveguide-slot system. Based on theoretical and experimental studies, it has been shown that the use of dielectric inserts in a waveguide allows one to control the polarization and energy characteristics of these radiators. It is possible to obtain high ellipticity and radiation coefficients of the field radiated and a good matching the system.