On Differentiation Among Pilot Signals of Multiple Mobile Targets in Retro-Reflective Beamforming for Wireless Power Transmission

Xin Wang; Long Li; Tie Jun Cui; Mingyu Lu

doi:10.1016/j.eng.2023.08.010

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Engineering ›› 2023, Vol. 30 ›› Issue (11) : 55-62. DOI: 10.1016/j.eng.2023.08.010

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Article

On Differentiation Among Pilot Signals of Multiple Mobile Targets in Retro-Reflective Beamforming for Wireless Power Transmission

Xin Wang^a ,
Long Li^b ,
Tie Jun Cui^c ,
Mingyu Lu^d^,^*

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Highlights

• An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers.

• An experimental system of digital retro-reflective beamforming for wireless power transmission is constructed.

• Experimental results demonstrate that it is very necessary for a retro-reflective wireless power transmitter to discriminate the pilot signals of multiple wireless power receivers among each other.

Abstract

An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers (referred to herein as “targets”). The experimental results demonstrate that, when multiple targets broadcast continuous-wave pilot signals at respective frequencies, a retro-reflective wireless power transmitter is capable of generating multiple wireless power beams aiming at the respective targets as long as the multiple pilot signals are explicitly separated from one another by the wireless power transmitter. However, various practical complications are identified when the pilot signals of multiple targets are not appropriately differentiated from each other by the wireless power transmitter. Specifically, when multiple pilot signals are considered to be carried by the same frequency, the wireless power transmission performance becomes heavily dependent on the interaction among the pilot signals, which is highly undesirable in practice. In conclusion, it is essential for a retro-reflective wireless power transmitter to explicitly discriminate multiple targets’ pilot signals among each other.

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Keywords

Wireless power transmission / Microwave antenna array / Retro-reflective beamforming / Pilot signal / Multiple access

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Xin Wang, Long Li, Tie Jun Cui, Mingyu Lu. On Differentiation Among Pilot Signals of Multiple Mobile Targets in Retro-Reflective Beamforming for Wireless Power Transmission. Engineering, 2023, 30(11): 55‒62 https://doi.org/10.1016/j.eng.2023.08.010

References

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[1]	A. Eid, J.G.D. Hester, M.M. Tentzeris. 5G as a wireless power grid. Sci Rep, 11 ( 2021), p. 636

[2]	L. Li, X. Zhang, C. Song, W. Zhang, T. Jia, Y. Huang. Compact dual-band, wide-angle, polarization-angle-independent rectifying metasurface for ambient energy harvesting and wireless power transfer. IEEE Trans Microw Theory Tech, 69 (3) ( 2021), pp. 1518-1528 DOI: 10.1109/tmtt.2020.3040962

[3]	X. Wang, S. Sha, J. He, L. Guo, M. Lu. Wireless power delivery to low-power mobile devices based on retro-reflective beamforming. IEEE Antennas Wirel Propag Lett, 13 ( 2014), pp. 919-922

[4]	J. He, X. Wang, L. Guo, S. Shen, M. Lu. A distributed retro-reflective beamformer for wireless power transmission. Microw Opt Technol Lett, 57 (8) ( 2015), pp. 1873-1876 DOI: 10.1002/mop.29209

[5]	Y.S. Cho. Development of transmitter/receiver front-end module with automatic Tx/Rx switching scheme for retro-reflective beamforming. J Inf Commun Converg Eng, 17 (3) ( 2019), pp. 221-226

[6]	H. Koo, J. Bae, W. Choi, H. Oh, H. Lim, J. Lee, et al.. Retroreflective transceiver array using a novel calibration method based on optimum phase searching. IEEE Trans Ind Electron, 68 (3) ( 2020), pp. 2510-2520

[7]	X. Wang, B. Ruan, M. Lu. Retro-directive beamforming versus retro-reflective beamforming with applications in wireless power transmission. Prog Electromagn Res, 157 ( 2016), pp. 79-91

[8]	H.S. Park, S.K. Hong. A performance predictor of beamforming versus time-reversal based far-field wireless power transfer from linear array. Sci Rep, 11 ( 2021), p. 22743

[9]	Takahashi T, Sasaki T, Homma Y, Mihara S, Sasaki K, Nakamura S, et al. Phased array system for high efficiency and high accuracy microwave power transmission. In:Proceedings of IEEE International Symposium on Phased Array Systems and Technology; 2016 Oct 18-21; Waltham, MA, USA; 2016.

[10]	S.T. Khang, D.J. Lee, I.J. Hwang, T.D. Yeo, J.W. Yu. Microwave power transfer with optimal number of rectenna arrays for midrange applications. IEEE Antennas Wirel Propag Lett, 17 (1) ( 2018), pp. 155-159 DOI: 10.1109/lawp.2017.2778507

[11]	P.D. Hilario Re, S.K. Podilchak, S.A. Rotenberg, G. Goussetis, J. Lee. Circularly polarized retrodirective antenna array for wireless power transmission. IEEE Trans Antennas Propag, 68 (4) ( 2020), pp. 2743-2752 DOI: 10.1109/tap.2019.2952011

[12]	M. Fairouz, M.A. Saed. A complete system of wireless power transfer using a circularly polarized retrodirective array. J Electromagn Eng Sci, 20 (2) ( 2020), pp. 139-144 DOI: 10.26866/jees.2020.20.2.139

[13]	Zhai H, Pan HK, Lu M. A practical wireless charging system based on ultra-wideband retro-reflective beamforming. In: Proceedings of IEEE International Antennas and Propagation Symposium; 2010 Jul 11-17; Toronto, ON, Canada; 2010.

[14]	Liu M, Wang X, Zhang S, Lu M. Theoretical analysis of retro-reflective beamforming schemes for wireless power transmission to multiple mobile targets. In: Proceedings of IEEE Wireless Power Transfer Conference; 2021 Jun 1-4; San Diego, CA, USA; 2021.

[15]	C.A. Balanis. Antenna theory: analysis and design. (3rd ed.), Wiley-Interscience, Hoboken ( 2005)

[16]	G. Pabbisetty, K. Murata, K. Taniguchi, T. Mitomo, H. Mori. Evaluation of space time beamforming algorithm to realize maintenance-free IoT sensors with wireless power transfer system in 5.7-GHz band. IEEE Trans Microw Theory Tech, 67 (12) ( 2019), pp. 5228-5234 DOI: 10.1109/tmtt.2019.2947463

[17]	A. Sarin, A.T. Avestruz. Code division multiple access wireless power transfer for energy sharing in heterogenous robot swarms. IEEE Access, 8 ( 2020), pp. 132121-132133 DOI: 10.1109/access.2020.3010202

[18]	W. Hong, Z.H. Jiang, C. Yu, J. Zhou, P. Chen, Z. Yu, et al.. Multibeam antenna technologies for 5G wireless communications. IEEE Trans Antennas Propag, 65 (12) ( 2017), pp. 6231-6249

[19]	R. Ibrahim, D. Voyer, A. Breard, J. Huillery, C. Vollaire, B. Allard, et al.. Experiments of time-reversed pulse waves for wireless power transmission in an indoor environment. IEEE Trans Microw Theory Tech, 64 (7) ( 2016), pp. 2159-2170

[20]	M.L. Ku, Y. Han, H.Q. Lai, Y. Chen, K.J.R. Liu. Power waveforming: wireless power transfer beyond time reversal. IEEE Trans Signal Process, 64 (22) ( 2016), pp. 5819-5834

[21]	B. Li, S. Liu, H.L. Zhang, B.J. Hu, D. Zhao, Y. Huang. Wireless power transfer based on microwaves and time reversal for indoor environments. IEEE Access, 7 ( 2019), pp. 114897-114908 DOI: 10.1109/access.2019.2936250