A new rectifying antenna for 35 GHz wireless power transmission is presented. The rectifying antenna (rectenna) is designed on R/T Duroid 5880 substrate with ɛr=2.2 and thickness of 1.3 mm. The rectenna arrays are built by series-connecting single elements for higher DC output. The single element, the 1×2 array, and the 2×2 array achieve RF-to-DC conversion efficiencies of 35% when the power density is 30 mW/cm2, corresponding to DC voltages of 0.45, 0.93 and 1.73 V, respectively. The linearity of the rectenna is good, hence it can be used as the building block to assemble a large rectifying antenna array with predictable output performance.
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Ren et al. (2007) studied this question.
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