This paper presents the design and analysis of a superdirective rectenna optimized for enhanced RF-to-DC efficiency and realised gain, featuring direct impedance matching between the antenna and the rectifier. Employing passively loaded, low profile strip dipoles on a low-loss substrate, the rectenna achieves a realised gain of 6.9 dBi and an RF-to-DC efficiency of 22.1% at -20 dBm.
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Graham et al. (2024) studied this question.
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