Figure 1-6. Test set-up of microwave power transmission system at Marshall Space Flight Center in 1970. The magnetron which converts de power at 2450 MHz is mounted on the waveguide input to the pyramidal horn transmitting antenna. The rectenna in the background intercepts most of the transmitted power and converts it to de power.’ Ratio of de power out of rectenna to the rf power into the horn was 40. 8%. Overall dc-to-dc efficiency was 26. 5%.
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