Figure 1-1. First experiment in the efficient transfer of power by means of microwaves at the Spencer Laboratory of Raytheon Co. in May 1963. In this experiment microwave power generated from a magnetron was transferred 5. 48 meters and then converted with DC power with an overall efficiency of 16%. A conventional pyramidal horn was used to collect the energy at the receiving end and a close-spaced thermionic diode was used to convert the microwaves into DC power. The DC power output was 100 watts.
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