The weight of the rectenna structure is a significant part of the total design load and, thus, enters into the material selection process. Environmental loads include wind, rain, snow and ice, etc. Studies (ref. 35) have indicated that steel is the most cost effective material for the rectenna structure. Other materials studied were aluminum and wood. The disadvantages of aluminum are relatively high cost (compared to steel) and electrical energy demand for its production. Wood is projected to have a higher cost and its lifetime is questionable.
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