The cost of delivered power increases as the sidelobe level is suppressed; thus the absolute minimum cost is about $1930/kW for the case of uniform illumination with its relatively high first sidelobe level of -17.6 dB. It is interesting, however, that there is a minimum total cost system ($9.9 billion) which corresponds to the relatively low sidelobe level of -27 dB and that for this system the cost of power (~ $2080/kW) is slightly less than for the current reference system whose total cost is much greater ($11.8 billion). The same general conclusions will also apply to a klystron-powered system, but the numbers will change because of differing cost elements and microwave constraints (Sr = 21 kW/m2 instead of 28). REFERENCES 1. U.S. Department of Energy and National Aeronautics and Space Administration, SPS Concept Development and Evaluation Program Reference System Report, DOE/ER-0023, 1978. 2. W.C. Brown, Satellite Power System (SPS) Magnetron Tube Assessment Study, NASA Contractor Report 3383, 1981. 3. G.M. Hanley, Satellite Power Systems (SPS) Concept Definition Study (Exhibit D), Volume II, Sys- tems/Subsystems Analyses, NASA Contractor Report 3393, 1981. 4. G.M. Hanley, Satellite Power Systems (SPS) Concept Definition Study (Exhibit D), Volume Vl-Part 2, Cost and Programmatics Appendix, NASA Contractor Report 3398, 1981. 5. C.E. Mack. Jr. and H. G. Moyer, Optimization of Antenna Pairs for Microwave Power Transmission, Space Solar Power Review 1, 221-240, 1980. 6. D. Arndt. E.H. Kerwin, and J.H. Suddath, Optimization of the SPS Antenna Illumination, NASA Johnson Space Center letter report (EH2-81-042), dated May 4, 1981. 7. R.C. Hansen, A One-Parameter Circular Aperture Distribution with Narrow Beamwidth and Low Sidelobes, IEEE Trans. Antennas Propagat. AP-24, 476-480, 1976. 8. A.W. Love. Basics of SPS Power Transmission from Space. IEEE Antennas and Propagation Society Newsletter 22, 5-8, 1980.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==