Fig. 6. Illustration of possible experiments with two units of power stations and supporting equipments. System Concept The artist's concept of this model is shown in Fig. 7. Major elements of the subscale model are |1] an antenna structure of one third scale of actual model where a hundred meter diameter phased array antenna will be mounted for the preliminary transmission test, [2] two units of the actual model of rotating mechanism to connect antenna and solar array structures, [3] a solar array structure which consists of twenty-four 100 meter square units is large enough to accommodate solar cells to generate electrical power of 30 MW, and 141 propulsion units installed on the antenna and dummy antenna to boost up overall system to a geosynchronous orbit. Mission Operation This system will be constructed in a low Earth orbit similar to that of space stations and then will be operated to conduct power transmission test from orbit to ground receiving antennas. Since the orbit is not synchronized with the Earth rotation in this case, the antenna mechanically preset to the direction of the receiving antenna will begin to transmit the microwave power when it enters the beam of a beacon radio wave from the receiving station. The power transmission duration is limited as short as ten seconds, since the range of pointing of the microwave power beam of the phased array antenna is approximately six degrees. Various receiving
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