the operating conditions of the microwave transmitter, generally frequency and power ranges, are derived. A review of the existing microwave tubes, fulfilling all constraints, is then made. Finally, the optimal solution, as viewed by Thomson Tubes Electroniques, is described in more details. 5. BASIC ASSUMPTIONS The antenna and rectenna are assumed circular and in near-field conditions. The collection efficiency is then: Assuming n=90% in all options, the following approximation applies: As the antenna and rectenna diameters are in the sub-meter or meter range for all options, the second assumption, except otherwise specified, will be:
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