8. An Assessment of Life of Rectenna Elements Previous life tests were continued on a no-charge basis but with the use of test equipment available for this technology development program. The life test procedure involved 199 rectenna elements and diodes divided up into sets that were differentiated from each other by the value of the microwave power density falling upon them. A continuous run of 2763 hours was obtained with no element or diode failures corresponding to a 27.3 year MTBF with a 90% confidence factor. About 50% of the elements were run at power levels substantially above the maximum specified for the base line design of the SSPS.
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