The Rectenna dipole-filter-diode assembly and power bus are expected to be the significant sources of harmonic radiation. The harmonic energy will be concentrated in calculable grating lobes, as shown in Figure 2. • DIRECTIONAL CHARACTERISTICS OF HARMONIC SCATTERING FROM A RECTENNA CAN BE DETERMINED BY GRATING LOBE ANALYSIS. WITH THE RECTENNA RECEIVING ELEMENTS, POWER BUS AND OTHER RECTENNA COMPONENTS AS RADIATORS. FIGURE 2 EXAMPLES OF DIRECTIONAL CHARACTERISTICS OF SCATTERING FROM RECTENNA AT HARMONICS OF POWER BEAM FREQUENCY A large object flying through the power beam over the Rectenna causes diffraction patterns to be generated at the Rectenna, as depicted in Figure 3. Therefore, Rectenna diodes should have tolerance to the resulting overvoltage and thermal transients. Among the factors causing scattering are microwave beam depolarization and amplitude fluctuations caused by disturbances in the atmosphere. Depolarization is not expected to be a significant source of scatter. Amplitude fluctuations cause scattering by disrupting the uniformity of the Rectenna illumination. In addition, this disruption of the RF power level from design values for the diodes causes impedance mismatches resulting in further scattering.
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