Figure 1-13. Photograph of the microwave power transmission system at the Raytheon Co. in which a certified overall DC to DC efficiency of 54% was obtained in March 1975. Magnetron at left of picture converts de power into microwave power which is fed into the throat of the dual-mode horn. The horn illuminates the rectenna panel with a gaussian distribution of power. Rectified de power is collected from the rectenna in circular ring paths and is dissipated in resisDve loads on the test panel at the right. Figure 1-14. Distribution of system and subsystem efficiencies (measured and estimated) in the experiment to obtain a certified measurement of DC to DC efficiency in March 1975 at the Raytheon Company.
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