Fig. 4.7. SPS Transmitting Antenna Pattern would be impacted by SPS emissions outside the rectenna enclosure. Figure 4.7 shows the main beam and sidelobe structure for the SPS using a 5 dB taper. Design literature for the SPS microwave power transmission system (MPTS) refers to the possible use of 5 dB, 10 dB, and 17 dB sidelobe tapers. The 5 dB taper was used for the studies here to allow worst case impact estimates. The rectenna site is shown with center at 35° 8* North, 117° 30' West. The rectenna covers an area roughly 100 km . The outer elipse is roughly 49 km in radius and corresponds to the peak of the last sidelobe shown in Fig. 4.7. Generally, in dealing with communications systems, field intensities measured at an antenna are given in microvolts per meter (pV/m). For high power televisions or AM/FM broadcast stations, the field intensity beyond a mile, but within a few tens of miles, may be measured in millivolts
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