Analysis of antenna structure for energy beamforming in wireless power transfer

Yongseok Lim, Hyun Seok Ahn, Jongsun Park

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The technology to send a magnetic field in a particular direction, known as energy beamforming, has been recently introduced as a magnetic field shaping technology in nonradiative wireless power transmission. In general, one of the most efficient conditions for energy beamforming is that the magnetic fields induced by each antenna should be synthesized to head the same direction. To synthesize the magnetic fields induced at each antenna, interference by mutual inductance that can occur between transmitting (TX) antennas should be minimized. In addition, energy should not be exchanged between the TXs, otherwise it lowers the transmission efficiencies of TX and receiving antenna. In this paper, we present an optimal antenna structure that minimizes the mutual inductance between two TX antennas. First, we have analyzed the mutual inductance between TX antennas that have asymmetric sizes with different antenna lengths and arrangement angles. The directivity of the magnetic field vector is also investigated through an experimental analysis of an antenna structure. Finally, it has been verified that the optimal TX antennas for energy beamforming should be symmetric, which means that all the length of antennas are same and disposed perpendicular to each other. The experimental results show that the deviations of magnetic field directivity for symmetric and asymmetric antennas are 0.045 and 0.355, respectively, which shows that the symmetric structure shows 8.2 times larger consistency over the asymmetric structure.

Original languageEnglish
Article number8046032
Pages (from-to)6085-6094
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Volume65
Issue number11
DOIs
Publication statusPublished - 2017 Nov

Bibliographical note

Funding Information:
Manuscript received September 30, 2016; revised June 16, 2017; accepted September 3, 2017. Date of publication September 19, 2017; date of current version October 27, 2017. This work was supported in part by the Korea Government (MSIP) through the National Research Foundation under Grant 2016R1A2B4015329 and in part by the Korea Government (MSIT) through IT Research and Development Program of IITP under Grant R-20160222-002757. (Corresponding author: Jongsun Park.) The authors are with the School of Electrical Engineering, Korea University, Seoul 136-701, South Korea (e-mail: [email protected]; jongsun@ korea.ac.kr).

Publisher Copyright:
© 1963-2012 IEEE.

Keywords

  • Beamforming antenna
  • energy beamforming
  • magnetic field shaping
  • wireless power antenna
  • wireless power transfer (WPT)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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