The first geostationary satellite made by Korea, COMS, has the three different payload; Meteorological sensor, Oceanographic sensor and Ka-band communication payload. There are Meteorological Ocean Data Communication Subsystein (MODCS) and Telemetry, Command and Ranging Subsystem (TCR) as other RF radiation sources. MODCS transmits and receives Meteo and Ocean measurement data from/to earth using L-band and TCR using S-band. The Ka-band communication payload will provide high-speed multimedia services and communication services for natural disaster such as prediction, prevention, and recovery services in the government communications network. Ka-band beacon is for the earth antenna pointing and the experiment of rain fading. This paper gives the analysis results about the mutual radiation effect on Ka-band communication payload, Ka-band beacon, MODCS and TCR. Up/Down link power and coupling factor including the geometrical position and distance of antenna, filter rejection and degradation factor due to the different polarization are considered. The results show MODCS and TCR are compatible for Ka-band communication payload and Ka-band beacon does not interfere with MODCS and TCR normal operation.
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