12/21GHz dual-band feed antenna for satellite broadcasting receiving reflector antenna

We designed a 12/21-GHz-band feed antenna applying a circularly polarized microstrip array antenna for satellite broadcasting receiving antenna. Simulation results show that the VSWR was less than 1.5 throughout the target range in both bands and the beamwidth of the 12-GHz band was almost the same value to that in the 21-GHz band. We computed the radiation pattern of the parabolic reflector antenna fed by the designed feed antenna; the aperture efficiencies were 68 % and 70 % for the 12and 21-GHz band, respectively. The reflector antenna with the designed feed antenna was confirmed to have reception compatibility for both bands. In the future, we will manufacture a dual-band feed antenna and evaluate its performance in the 12/21-GHz-band.