Technique for Cooling Transmitter Tubes Beam Control Techniques Transmitting Antenna Illumination Pattern Peak Receiving Antenna Power Density A broad range of Satellite Power System (SPS) considerations were investigated to ascertain their impact on the MPTS. These included the following: Socio-Economic Considerations Power Source Operations and Maintenance Flight Operations Transportation System Re-Supply SPS Flight Mechanics Orbital Assembly System Assurance Technologies Reliability Safety Environmental Impact The study did not evaluate resource utilization and energy payback. These were addressed in reference 5, however they should be further investigated in the course of maturing the detail design features. 1.2 CONCLUSIONS AND RECOMMENDATIONS 1.2.1 GENERAL The recommended transmitting antenna is a planar phased array about 1 km in diameter constructed of aluminum or composites and weighing about 6 x 106 kg. It consists of 18M x 18M slotted waveguide subarrays which are electronically controlled to direct the power beam at the ground receiving antenna which results in an rms error of about 10M. The subarrays use groups either of 5 kW amplitrons in series or 50 kW klystrons in parallel to convert input dc power to microwave power. The receiving antenna is an array about 10 km in diameter consisting of dipole elements each integrated with a solid state diode and filters which convert microwave power back to dc power.
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