TY - JOUR
T1 - Wireless Power Transfer with Distributed Antennas
T2 - System Design, Prototype, and Experiments
AU - Shen, Shanpu
AU - Kim, Junghoon
AU - Song, Chaoyun
AU - Clerckx, Bruno
N1 - Funding Information:
Manuscript received May 20, 2020; revised August 19, 2020, September 23, 2020, and October 4, 2020; accepted October 23, 2020. Date of publication November 16, 2020; date of current version July 19, 2021. This work was supported in part by the EPSRC of U.K. under Grant EP/P003885/1 and EP/R511547/1. (Corresponding author: Shanpu Shen.) Shanpu Shen, Junghoon Kim, and Bruno Clerckx are with the Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2AZ, U.K. (e-mail: s.shen@imperial.ac.uk; junghoon.kim15@imperial.ac.uk; b.clerckx@imperial.ac.uk).
Publisher Copyright:
© 1982-2012 IEEE.
PY - 2021/11
Y1 - 2021/11
N2 - In this article, we design and experiment a far-field wireless power transfer (WPT) architecture based on a distributed antenna system (DAS), so-called WPT DAS, that dynamically selects transmit antenna and frequency to increase the output dc power. Uniquely, spatial and frequency diversities are jointly exploited in the proposed WPT DAS with low complexity, low cost, and flexible deployment to combat the wireless fading channel. A numerical experiment is designed to show the benefits using antenna and frequency selections in spatially and frequency selective fading channels for single-user and multiuser cases. Accordingly, the proposed WPT DAS for single-user and two-user cases is prototyped. At the transmitter, we adopt antenna selection to exploit the spatial diversity and adopt frequency selection to exploit the frequency diversity. A low-complexity over-the-air limited feedback using an IEEE 802.15.4 RF interface is designed for antenna and frequency selections and reporting from the receiver to the transmitter. The proposed WPT DAS prototype is demonstrated in a real indoor environment. The measurements show that WPT DAS can boost the output dc power by up to 30 dB in a single-user case and boost the sum of the output dc power by up to 21.8 dB in the two-user case and broaden the service coverage area in a low cost, low complexity, and flexible manner.
AB - In this article, we design and experiment a far-field wireless power transfer (WPT) architecture based on a distributed antenna system (DAS), so-called WPT DAS, that dynamically selects transmit antenna and frequency to increase the output dc power. Uniquely, spatial and frequency diversities are jointly exploited in the proposed WPT DAS with low complexity, low cost, and flexible deployment to combat the wireless fading channel. A numerical experiment is designed to show the benefits using antenna and frequency selections in spatially and frequency selective fading channels for single-user and multiuser cases. Accordingly, the proposed WPT DAS for single-user and two-user cases is prototyped. At the transmitter, we adopt antenna selection to exploit the spatial diversity and adopt frequency selection to exploit the frequency diversity. A low-complexity over-the-air limited feedback using an IEEE 802.15.4 RF interface is designed for antenna and frequency selections and reporting from the receiver to the transmitter. The proposed WPT DAS prototype is demonstrated in a real indoor environment. The measurements show that WPT DAS can boost the output dc power by up to 30 dB in a single-user case and boost the sum of the output dc power by up to 21.8 dB in the two-user case and broaden the service coverage area in a low cost, low complexity, and flexible manner.
KW - Antenna selection
KW - distributed antennas
KW - diversity
KW - frequency selection
KW - rectenna
KW - wireless power transfer (WPT)
UR - http://www.scopus.com/inward/record.url?scp=85111980652&partnerID=8YFLogxK
U2 - 10.1109/TIE.2020.3036238
DO - 10.1109/TIE.2020.3036238
M3 - Article
AN - SCOPUS:85111980652
SN - 0278-0046
VL - 68
SP - 10868
EP - 10878
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 11
ER -