Ground Systems - (excluding DC bus bars) Rectenna is 10 km in diameter; TOTAL COST The $1.29X109 cost for the rectenna and facility is heavily dependent upon the diode and assembly cost/unit. A large variation in the $.015/unit cost could significantly change the rectenna cost. IV.A.2(j) FAILURE MODE ANALYSIS Studies were made into three types of discrete failures in the transmit antenna (1) a partial breakdown in the phase control system, (2) a total breakdown of the phase control system, and (3) a partial breakdown in the DC power distribution system. If the feedback phase control to the subarrays has large errors induced into the system, the subarrays no longer add in-phase to create a high power, narrow beam signal. Each subarray may act as an individual antenna, radiating its energy to the earth as a wide beamwidth signal. The power density at the rectenna for a large phase error of 135° is shown in Figure IV.A.2i9. The power density into and around the rectenna decreases by a factor of 100 within the main beam when compared to a properly phased-signal. Comparative si delobe levels will increase with distrance from the rectenna.
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