3.2, corresponding to a first sidelobe level of -27.0 dB. The power delivered to the grid is 4.75 GW. CONCLUSIONS The results of this parametric study show that the cost of delivered power for a magnetron-powered SPS is minimized when the rectenna is sized to intercept the spacetenna beam at a level between 3.2 and 3.7 mW/cm2. This is true for designs in which sidelobe levels vary from -17.6 dB (uniform illumination) to -31.3 dB (highly tapered). The current reference system delivers power at a cost of $2110/kW. This cost can be reduced by 6%, to $1990/kW, merely by decreasing rectenna diameter so that the intercept level goes from 1.0 to 3.4 mW/cm2. Alternatively, the current reference system can be redesigned to yield nearly a -27 dB sidelobe level, at no increase in the cost of delivered power, by using a rectenna intercept level of about 3.3 mW/cm2, along with a more tapered spacetenna illumination.
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