Abstract
A satellite broadcasting system for the 21-GHz BSS (broadcasting satellite service) band which has multi-beam variable EIRP (equivalent isotropically radiated power) transponders is studied taking into account compensation for the rain attenuation. First, the relationship between the number of beams and radiation power which is necessary for nationwide coverage in Japan is discussed. The result shows that an employment of a 6-beam variable EIRP system can reduce the necessary output power to a half that of a fixed EIRP system. Second, to study the system feasibility, some key components were manufactured experimentally. We have developed a multi-beam antenna, which consists of a 6horn feed and a single parabolic reflector, and high-power TWTs. To realize the variable EIRP system, a method to control the output power of TWT for achieving maximum efficiency is proposed. By combining two TWTs in parallel, a maximum output of 430 W was obtained with this method.
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