o center of the rectenna to 20 mW/cm , a level that should 2 meet anticipated environmental standards. The 20 mW/cm value is currently understood to be the threshold level for affecting changes in the ionsphere. It should be noted, however, that the affects of these anticipated changes are currently unknown. The satellite's mass in orbit is 18 million kilograms. An operating frequency of 2.45 GH was selected based on considerations of power transmission efficiency, low susceptability to brownouts in rain, and minimal potential problems due to radio frequency interference. The transmitting antenna is an active planar phased array which uses amplitrons for de to rf power conversion. The photovoltaic power source generates 8.6 thousand magawatts of power using an advanced, 50 mi cron-thick , silicon blanket which operates at 13.7% efficiency at a solar concentration ratio, 2. The power conversion efficiency from solar blanket busbar to ground station busbar is 58 percent. The design concept has two large solar cell arrays, each approximately 6 km x 5 km, inter-connected by a carry- through structure of dielectric material. A 0.83 km diameter microwave antenna is located on the centerline between the two arrays and is supported by the central power transmission bus (mast) structure that extends the full length of the power station. The antenna is attached to the mast structure by a joint system which rotates 360+ degrees in azimuth (East-West) and ^8 degrees in elevation (North-South). The solar cell blankets are laid out between channel concentrators stretched over a supporting frame.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==