unknowns from the system side remain, e.g. : the specific size of the rectenna; mass and volume of the receiver s equipment, as well as of the data link for returning the results to the Orbiter; the kind of power source on-board the target (e.g. is enough power being beamed to it to provide for the experiment's functions?); the degree of sophistication of the on-board avionics. [The following section was provided February 19, 1992] PIC RECTENNA FOR POWER BEAMING DEMONSTRATION 1. PIC-Rectenna Size We have considered the largest torus + membrane rectenna configuration that can be fitted into a volume of 0.5 x 0,5 x 0,7 m3. For the rectenna membrane, we have assumed a 1-mil Kapton H film, estimating its average area mass at 0.042 kg/m2. including the bond lines necessary to form the circular surface, and some aluminization. For the centrifugal acceleration, used to stabilize the rectenna/ASAP complex, we have assumed x = 10 mm/s2 - which for a 200-m rotation radius corresponds to an 888-s period. The following "largest" reference configuration is proposed; • torus crown radius a = 6,4 m • torus meridian radius b = 0,14 m i.e. rectenna's diameter D = 12.5 m
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