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ABSTRACT
A novel high-efficiency, compact metamaterial-inspired rectifier is proposed for 900-MHz wireless power transmission (WPT) applications. The open-ended composite right/left-handed (CRLH) transmission line (TL) stub, which is introduced to realize metamaterials, replaces the band-pass filter (BPF) of a conventional rectifier (and is smaller than the traditional BPF). The open-ended CRLH TL stub is designed to suppress second- and third-order harmonics and to match the fundamental frequency to a 50-Ω impedance. The device is implemented using lumped elements and a microstrip line. The maximum RF-to-DC conversion efficiency of the proposed rectifier is 69.9% at an input power of 50 mW and a load of 1.8 kΩ. A design procedure that is based on minimizing the phase response of a CRLH TL is presented and validated by simulated and measured results. Because the single CRLH stub is used for harmonic suppression, miniaturization is achieved while retaining efficiency similar to that of previous rectifiers.
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No potential conflict of interest was reported by the authors.
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Notes on contributors
Sungjin Choi
Sungjin Choi received BS degree and MS degree in electrical and electronics engineering, Chung-Ang University, Seoul, Korea in 2013 and 2015, respectively. He is working in Hyundai Autron, Korea.
Ahmed Salim
Ahmed Salim received BS degree in electrical engineering, University of Engineering & Technology Lahore, Pakistan, in 2007. He received MS degree from electrical engineering, Linkoping University, Sweden, in 2011. He is currently working toward PhD degree in electrical and electronics engineering, Chung-Ang University, Seoul, Korea.
Heijun Jeong
Heijun Jeong received BS degree in information and communication engineering, Anyang University in 2015. He is currently working toward MS degree in electrical and electronics engineering, Chung-Ang University, Seoul, Korea.
Sungjoon Lim
Sungjoon Lim received BS degree in electronics engineering, Yonsei University, Seoul, Korea, in 2002. He received MS degree and PhD degree in electrical engineering, University of California, LA, USA, in 2004 and 2006, respectively. Since 2007, he is currently a full professor in electrical and electronics engineering, Chung-Ang University, Seoul, Korea.