per meter. Most likely for the average TV owner, the level of a field intensity measured at the home antenna would be in the microvolt per meter range. This will help to put the amount of energy beyond the rectenna site, due to sidelobe structure, in proper perspective. Referring back to Fig. 4.7, the right-hand scale has two number values. One is power density in milliwatts per centimeter squared (mW/cm^) and a corresponding scale is shown of field intensity in volts per meter which an antenna might see. If one were to connect the peaks of the sidelobes with a line, the result would be a curve which would approach the dashed line marked "scattered power density," asymptotically. It will be noticed that the field intensity beyond 50 km from the center of the rectenna site would still be 1 V/m at the 2.45 GHz frequency, representing a sizable input to communication systems operating within 100 km of the rectenna site. Added to the electromagnetic field, due to sidelobes, is the power scattered from the main beam from media effects. Some preliminary assessments have been made at five sites surrounding the rectenna site in the Mojave. Those sites and the distance from the rectenna are given in Table 4.2. Table 4.3 shows the predicted field intensity due to sandstorms occurring in the main beam. These results are for scattering by the largest possible common volume, that formed by the sandstorm and the SPS main beam, and would be considered worst case. A similar table was produced for duststorms which showed an insignificant amount of scatter. Table 4.2. Selected Site Distances from Mojave Rectenna Table 4.3. SPS Incident Power At Mojave Sites
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