Improved Splash-Plate Feed Parabolic Reflector Antenna for Ka-Band VSAT Applications

In this study, we propose a conical dielectric loaded circular waveguide opening to splash plate subreflector for parabolic antenna feed. Corrugations on the dielectric lens and splash-plate structure are optimized for antenna performance. The feed structure is designed as axi-symmetric to support zero-order azimuth currents for low cross-polarization. Resulting structure offers good gain, low sidelobe, good cross polarization, and low VSWR for Ka-band VSAT applications where receive and transmit frequency bands arc 20.2-21.2 GHz and 30-31 GHz, respectively.