version and transmission electronics. Figures 3 and 4 are incorrect for LPS. The periodic grating lobe pattern from a periodically spaced array vanishes if the elements of the array are either randomly displaced in lateral spacing or elevation. For LPS the mean amplitude in the side lobe region of a given beam is down on average by more than 1/W where N is the number of radiating elements. N will be at least in the 10s of millions for an oversized lunar aperture. Two more deficiencies are use of oversized rectenna areas and selection of a microwave radiator system completely filling the minimum aperture with slotted waveguides. The subject study used a fourfold increase in rectenna area per site which gives an effective duty cycle of about 8% in comparison with an equivalent SPS rectenna. We have described a beam shaping option which will raise effective duty cycles to at least 27% which would reduce rectenna costs for LPS to about V3 that obtained in the subject study. The 100-fold increase in micro wave aperture area per base was translated in the subject study to corresponding increases in waveguides, subarray structure and control, antenna pointing, etc. and a tenfold increase in DC-RF converters leading to an enormously costly DC-RF and beam propagation system. (A more reasonable alternative of a reflecting aperture using fewer waveguides was addressed in Appendix A Table 2 ALTERNATIVE COST BREAKDOWN (SIMPLIFIED)
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