Circular polarization generating coaxial to waveguide adapter for horn antenna

This paper deals with a coaxial-to-waveguide adapter generating circularly polarized wave to be connected with horn antennas. By combining the polarization twisting structure and the phase delay structure, the circular polarization is successfully generated in the waveguide. The designed and implemented adapter shows that the present structure can significantly reduce the size of the adapter for circularly polarized horn antenna.