The performance and efficiency of three planar rectennas, designed on three different PCB materials, have been evaluated at 2.45 GHz. A maximum RF‐to‐dc conversion circuit efficiency of 55% was achieved. An output dc voltage of 1 V was measured over a distance of 1 m from a rectenna having 7 dB antenna gain.
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Heikkinen et al. (2001) studied this question.
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