NDLI: Seamless exploitation of cell-phone antennas for near-field WPT by a frequency-diplexing approach

Content Provider	IET Digital Library
Author	Prete, Massimo Del Berra, Francesco Costanzo, Alessandra Masotti, Diego
Abstract	This paper introduces a novel solution for portable devices to exploit their existing communication antennas for bi-directional near-field wireless re-charging, without compromising their far-field properties. To demonstrate the concept, the radio-frequencies (RF) 900/1800 MHz and 433 MHz are adopted for the far-field communication and for the near-field wireless recharging, respectively. First, a pair of faced, dual-band, printed monopoles is characterized as a two-port network over the bands of interest at several distances. Then, each antenna is fed by a frequency-selective three-port network, designed to simultaneously ensure data communication at the higher frequencies and wireless re-charging at the lower one. In this way, the combined far-field and near-field operations of the resulting four-port network can be optimized. A proof-of-concept prototype has been characterized, showing ports isolation higher than 20 dB and RF-to-RF power transfer efficiency between 15% and 40% for variable faced antennas distance. When a rectifier is connected to the receiving power port, the measured RF-to-dc link efficiency varies between 9% and 20%, with portable devices located 1 and 2 centimeters apart, and the transmitted power is 10 dBm. The simultaneous high frequency communication is verified with slightly reduced performance.
Starting Page	649
Ending Page	656
Page Count	8
ISSN	17518725
Volume Number	11
e-ISSN	17518733
Issue Number	Issue 5, Apr (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/11/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2016.0281
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2016-11-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Accessory Antenna Feeds Bidirectional Near-field Wireless Recharging Cell-phone Antenna Seamless Exploitations Communication Antenna Data Communication Directive Antenna Dual-band Antenna Efficiency 15 Percent to 40 Percent Faced Antenna Far-field Communication Far-field Radiation Frequency 433 MHz Frequency-diplexing Approach Frequency-selective Three-port Network Full-wave Analysis GSM 900/1800 Inductive Power Transmission Link Input Power Port Microstrip Antenna Mobile Antenna Mobile Handsets Monopole Antenna Multifrequency Antenna Near-field Communication Near-field WPT Portable Device Power Transfer Efficiency Printed Monopole Antenna Radio Frequency Power Transmission Receiving Power Port Rectifier Dc Output RF-to-dc-link Efficiency RF-to-RF Power Transfer Efficiency Single Antenna Two-port Network UHF Antenna
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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