Study on 12/21-GHz Dual-circularly Polarized Receiving Antenna for Satellite Broadcasting

In December 2018, satellite broadcasting of ultra-high-definition television (UHDTV) will begin in Japan. For broadcasting UHDTV, BSAT-4a satellite was successfully launched. The satellite has not only 12-GHz-band right- and lefthand circular polarization transponders but also a 21-GHz-band experimental transponder. To receive services provided over these two frequency bands and with dual-polarization, we designed a dual-circularly polarized parabolic reflector antenna fed by 12- and 21-GHz-band microstrip antenna arrays with a multilayer structure. Finally, we confirmed through simulation that the designed antenna satisfies our requirements.