Mobile antennas for reception of S-DARS

Despite the difficult specification written for the mobile antenna and LNA to receive inclined elliptical orbit S-DARS satellite signals, several suppliers have successfully demonstrated various solutions, easily attaining the -19 dB/K G/T requirement over a wide (130/spl deg/) elevation beamwidth. Antenna size is generally in the order of 1/4 to 1/2 /spl lambda/, and the integrated antenna and LNA at S-band is about the size of a computer mouse. This seems compact enough for most customers to mount on the roof of a small car, or other vehicle. The terrestrial antenna is integrated into the same radome as the satellite antenna, with little or no impact upon the appearance of the antenna module.