Abstract
A key technology for designing a compact mobile receiver for direct broadcasting satellites (DBS) is presented and three sub-antenna arrangements are shown. In-phase combiner circuits for the output of the sub-antennas increase the antenna gain while keeping the beamwidth equal to that of the sub-antennas. Phase locked loop (PLL) performance is analyzed in terms of both the lock range and capture range. The driving mechanism of the turntable in the azimuth is studied from the points of view of weight and cost. A compact DBS mobile receiver for small cars is fabricated taking into account the above studies. Experiments in Tokyo, Osaka, and Fukuoka verified that it can receive satellite signals with a C/N of more than 12 dB.
