Figure 13-7. Phase III Rectenna A dc-ac Inverter is recommended so that transmission demonstrations can use loads within the local power grid. The greater range than in Phases I and II better models the equivalent distance for atmospheric turbulence effects found in an operational configuration, and it also provides realistic power density conditions at the rectenna. The received power density and related efficiency are shown in Figure 13-8 and the siting profile for the line-of-sight given in Figure 13-6 is shown in Figure 13-9* We see that the transmitter actually is looking down toward the rectenna and that clearance angles are quite small, although not so small as to block the main beam. Radiation over the intermediate roads probably would require that traffic be halted during demonstrations for safety. 13. 3. 5 ALTERNATE PHASE I CONVERTER IMPLEMENTATION The Phase I test could not incorporate the amplitron as proposed in the MPTS because, as will be seen shortly, the amplitron is a critical technology item requiring two to three years to produce a model for field use. Phase I,
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