Abstract
AbstractThe multipath fading in maritime satellite communications is a serious problem in any future system using the INMARSAT for small vessels. In this paper, a polarization controlling antenna consisting of a pair of Yagi arrays with a reflector is used. By adjustment of the antenna source, the polarization of the direction of incidence of the sea return wave (reserved direction) is synthesized so that the axial ratio is identical to that of the sea return wave but is in the opposite sense and the major axes are orthogonal to each other. Thus fading is reduced. In the present structure, the axial ratio remains desirable in the direction of the satellite even if it becomes large in the reserved direction due to polarization control. Hence polarization loss is small. Further, the mechanical attitude control system can be simplified since the antenna movement is controlled electronically. In the antenna design, the reflector can be treated as an infinite ground plane as long as it is larger than two wavelength square. First, the antenna dimensions are determined. Next, the source for the specified polarization, the axial ratio in the satellite direction and the radiation patterns are calculated for an antenna attitude. The model experiment has been performed for confirmation of the calculated results. The effect of the finite reflector on the electrical characteristics of the antenna is theoretically studied.
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