Onboard Antennas and Simulation of Service Availability for 21-GHz Band Broadcasting Satellite

摘要

Satellite broadcasting in the 21-GHz band is expected to transmit large-capacity signal by exploiting its wide bandwidth of 600MHz. However, it suffers from large rain attenuation. In order to compensate it, we have been studying rain fading mitigation techniques. In this paper, we show a method to control the radiation pattern dynamically in accordance with the movement of the rain area assuming array-fed reflector antenna using 61 horns. We compared the outage time using dynamically controlled radiation pattern (reconfigurable beam) formed by the array-fed reflector antenna with that using fixed radiation pattern formed by shaped reflector antenna while assuming the same input power to the antenna. According to the simulation during 7days, the accumulated outage time using dynamic radiation pattern was much less than 50% compared to that using static radiation pattern.