with no phase ambiguity because only multipliers are used and no dividers are used in the circuit. Transmitting Antennas and Rectennas Microstrip antennas are used for the active phased array of the autonomous transmitter module. Inter-antenna distance is chosen to be a half wavelength (~ 0.63 cm) to suppress the grating lobes. The merit of using the microstrip antennas is their light weight and ease of mass production. A sphere-shaped rectenna is recommended to attain the omni-directional directivity as shown in Figure 4. Each antenna element imbedded on the surface of the sphere-shaped balloon is a crossed dipole to achieve a light-weight rectenna. Missions of the PSS Possible missions of the PSS are; 1. Power transmission to small satellites 2. Power transmission to space stations 3. Experimental tests of energy transmission via microwave in space. The first two missions have practical purposes providing a unique infrastructure of a large power (~ 100 kW) supply to customers through a light-weighted and simple rectenna system. The third mission is a verification test of the functions of the transmitter modules and beam control system developed and adopted for the PSS. The tests will cover 1. Pointing accuracy and time response of the microwave energy beam, 2. Spatial distribution of the transmitted power produced by the side and grating lobes of the transmitter, 3. Frequency stability of the FET microwave generator and its noise characteristics, 4. Heat control of the module, 5. Attitude stability and mechanical distortion of the large disc of the modules. References [1] GLASER, P.E., (1968) Power from the Sun: Its future, Science, vl62, p857-886 [2] HANLEY, G. M. (ed ), (1980) Satellite Power System (SPS) Concept Definition Study, NASA CR, 3317,.
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