Figure 1-3. The first rectenna. Conceived at Raytheon Company, it was built and tested by R. George of Purdue University. Composed of 28 half-wave dipoles spaced one-half wave-length apart, each dipole terminated in a bridge-type rectifier made from four IN82G point-contact semi-conductor diodes. A reflecting surface consisting of a sheet of aluminum was placed one-quarter wavelength behind the array.
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