volume | PIER Journals

Abstract

This paper presents a compact loop-shaped omnidirectional rectenna for RF energy harvesting at 2.45 GHz and 5.8 GHz. Firstly, a loop-shaped antenna with iterated circular concave and convex structures is proposed to operate at both frequencies. Then, a rectifier circuit uses a complex impedance correlation matching technique to achieve high conversion efficiency. By connecting a piece of microstrip, two uncorrelated input impedances are transformed into a pair of conjugate impedances. In addition, by using a π-shaped structure with the same equivalent characteristic impedance and complementary equivalent electrical lengths at both frequencies, the pair of conjugate impedances are simultaneously matched to 50 Ω. The rectifier circuit is integrated in the loop-shaped antenna to form a compact dual-band rectenna. The overall size of the rectenna is 67.5 mm x 71.5 mm x 1.016 mm. The test results show that the S₁₁ of the antenna is -13.5 dB and -18.7 dB, and the peak conversion efficiencies of the rectenna are 65.1% and 38.4% at 2.45 GHz and 5.8 GHz, respectively. The simulated and tested results are quite similar.

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Dr. Lei Li

Dr. Ruifeng Xu

Dr. Jingxu Cao

Dr. Xue Li

Dr. Jingchang Nan