LIST OF ILLUSTRATIONS (Conf d) 1-7 Close-up view of the first rectenna developed by Raytheon under MSFC contract. Microwave collector, rectification, and DC bussing of rectified power are all carried out in one plane. Rectenna elements are conneced in series 14 1-8 Experimental set-up comprised of dual-mode horn and improved rectenna. The efficiency ratio of the de power from the rectenna to the microwave power at the input to the dual-mode horn was measured and found to be 60.2% 16 1-9 Sketch of the Marshall Space Flight Center rectenna which was constructed in spring of 1974. Cutaway section of rectenna element shows the two section input low pass filter, the diode, and a combination tuning element and by-pass capacitor. 1? 1-10 Photograph of the MSFC rectenna constructed in 1974 under test. Horn at left of picture illuminates the rectenna (white panel) with a Gaussian distribution of power. Rectified DC power is collected from rectenna in circular ring path and dissipated in resistive loads on the test panel at the right. 17 1-11 Simplified Electrical Schematic for the rectenna element used in the RXCV receiving array at the Venus site of the JPL Goldstone facility. 18 1-12 Photograph of rectenna element designed for JPL RXCV demonstration at Goldstone. This element represents the departure point for the technology development being reported upon. 18 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 resistive loads on the test panel at the right. 20 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. 20
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