Measurements of K-Band Antenna Patterns

Methods and results of on-board antenna pattern measurements of Medium-scale Broadcasting Satellite for Experimental Purpose (BSE) are described in this paper. The measurements were carried out by means of satellite attitude offsets about the pitch and roll axes. Measured antenna patterns at both up-and down-link frequencies (14 and 12GHz) agree with the pre-launch data in the eastwards of the patterns, while they have more gentle gain slopes in the westwards. Further, antenna pattern deformation is observed along with the change in the antenna temperature. The whole appearance of the deformation seems to be complicated, however, in the center regions of the patterns which almost covers Honshu island, the dominant behavior of the deformation looks like antenna beam shift of 0.1°to 0.2°in the east-west direction.