Article ID: 2022COL0004
Satellite broadcasting of UHDTV in Japan has used the 12-GHz band (11.7 to 12.75 GHz) since 2018. The 21-GHz band (21.4 to 22.0 GHz) has also been allocated to satellite broadcasting in Europe, Africa, and Asia Pacific. The BSAT-4a satellite not only has 12-GHz-band transponders for UHDTV services, but also 21-GHz-band experimental transponders for future broadcasting services. To receive services using these two frequency bands with a single antenna, we designed a 12- and 21-GHz dual-band horn antenna with a choke horn as the feed of a parabolic reflector antenna. Simulation results showed that an aperture efficiency of more than 70% was obtained in both bands.
