A Radio‑Frequency Loop Resonator for Short‑Range Wireless Power Transmission

doi:10.12142/ZTECOM.202202007

ZTE Communications ›› 2022, Vol. 20 ›› Issue (2): 43-47.DOI: 10.12142/ZTECOM.202202007

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A Radio‑Frequency Loop Resonator for Short‑Range Wireless Power Transmission

WANG Xin¹(), LI Wenbo², LU Mingyu³

^1.Chongqing University, Chongqing 400044, China
^2.Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
^3.West Virginia University Institute of Technology, Beckley, West Virginia 25801, USA

Received:2022-04-18 Online:2022-06-25 Published:2022-05-24
About author:WANG Xin (wang.x@cqu.edu.cn) received the BS and MS degrees in electronic engineering from Tsinghua University, China in 2000 and 2002 respectively, and the PhD degree in electrical and computer engineering from Purdue University, USA in 2009. He was a post-doctoral research associate with the Birck Nanotechnology Center, Purdue University from 2009 to 2010. From 2010 to 2021, he was an associate professor with the College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, China. Currently, he is a professor with School of Electrical Engineering, Chongqing University, China. His research interests include wireless power transmission, reconfigurable antennas, and RF circuit design.|LI Wenbo received the BS degree in electronic information engineering from Nanjing University of Aeronautics and Astronautics, China in 2019. He is currently an MS candidate in electronic information engineering at Nanjing University of Aeronautics and Astronautics. His research interests include wireless power transmission and RF circuit design.|LU Mingyu received the BS and MS degrees in electronic engineering from Tsinghua University, China in 1995 and 1997 respectively, and the PhD degree in electrical engineering from the University of Illinois at Urbana-Champaign, USA in 2002. From 2002 to 2005, he was a postdoctoral research associate with the Electromagnetics Laboratory, University of Illinois at Urbana-Champaign. He was an assistant professor with the Department of Electrical Engineering, University of Texas at Arlington, USA from 2005 to 2012. He joined the Department of Electrical and Computer Engineering, West Virginia University Institute of Technology, USA in 2012, where he is currently a professor. His research interests include wireless power transmission, radar systems, antenna design, and computational electromagnetics. Dr. LU received the first prize award in the student paper competition of IEEE International Antennas and Propagation Symposium (Boston, USA) in 2001. He served as the chair of Antennas and Propagation Society of the IEEE Fort Worth Section from 2006 to 2011, and received the Outstanding Service Award from the IEEE Fort Worth Section in 2008.
Supported by:
the National Natural Science Foundation of China(61871220)

Abstract

Abstract:

A microstrip loop resonator loaded with a lumped capacitor is proposed for short-range wireless power transmission applications. The overall physical dimensions of the proposed loop resonator configuration are as small as 3 cm by 3 cm. Power transmission efficiency of greater than 80% is achieved with a power transmission distance smaller than 5 mm via the strong coupling between two loop resonators around 1 GHz, as demonstrated by simulations and measurements. Experimental results also show that the power transmission performance is insensitive to various geometrical misalignments. The numerical and experimental results of this paper reveal a bandwidth of more than 50 MHz within which the power transmission efficiency is above 80%. As a result, the proposed microstrip loop resonator has the potential to accomplish efficient wireless power transmission and high-speed (higher than 10 Mbit/s) wireless communication simultaneously.

Key words: loop resonator, lumped capacitive loading, radio frequency, short-range wireless power transmission

WANG Xin, LI Wenbo, LU Mingyu. A Radio‑Frequency Loop Resonator for Short‑Range Wireless Power Transmission[J]. ZTE Communications, 2022, 20(2): 43-47.

Figures/Tables 11

Figure 1 Design of the proposed microstrip loop resonator

Figure 2 Two loop resonators (one transmitting and one receiving) for short-range wireless power transmission

Table 1 One set of parameters of the proposed microstrip loop resonator

δ	r	w	h	d	α	ε_r
0	1 cm	1 mm	1.5 mm	5 mm	120°	3.38

Figure 3 Simulated power transmission efficiency results with three different loading capacitance values and with parameters in Table 1

Figure 4 Simulated power transmission efficiency results with various angular misalignment values of θ, when C = 0.5 pF and d = 5 mm

Figure 5 Simulated power transmission efficiency results with various values of lateral misalignment δ, when C = 0.5 pF and d = 4 mm

Figure 6 Photos of fabricated loop resonator and experimental setup

Figure 7 Measured power transmission efficiency results with three different values of loading capacitance and with parameters in Table 1

Figure 8 Measured power transmission efficiency results with various values of angular misalignment θ, when C = 0.5 pF and d = 5 mm

Figure 9 Measured power transmission efficiency results with various values of lateral misalignment δ, when C = 0.5 pF and d = 4 mm

Figure 10 Measured power transmission efficiency results with various values of distance d, when C = 0.5 pF and δ = 0

References 6

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A Radio‑Frequency Loop Resonator for Short‑Range Wireless Power Transmission

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