9. 6. 3 SYSTEM COST Figure 9-25 summarizes the total system costs including installation labor. A rough estimate is also included of related site costs. These costs include handling and test equipment, footings and support structures, cable laying equipment, etc. Figure 9-25. Total Power Interface ROM Cost 9. 7 CONCLUSIONS AND RECOMMENDATIONS For the receiving antenna: a. An array of small independent elements able to collect and rectify incident microwave power is required for low cost and high efficiency. b. A linearly polarized dipole with GaAs Schottky barrier diode is recommended. c. Development of rectifying antenna elements including diodes for low power density is needed. d. Rectenna collection and conversion efficiency is 84 percent and a realistic development goal is 90 percent. e. Support structure is major cost item requiring further in-depth study as types of terrain, soils, mechanics and environments are established. f. Power interface to the user network needs development to reach 92 percent and greater efficiency. For a total output power of 5000 MW, the normalized cost is $45/kW
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