Antenna characterization for wireless power-transmission system using near-field coupling

Qiang Chen, Kazuhiro Ozawa, Qiaowei Yuan, Kunio Sawaya

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


A fundamental study was focused on the investigation of wireless power transmission by near-field coupling from the view point of the antennas. Two types of antennas - dipole and loop antennas - were used as the transmitting antenna and the receiving antenna for electrical near-field coupling and for magnetic near-field coupling, respectively. The relationships among the power-transmission efficiency and the antennas' geometries, the antennas' electrical sizes, the impedance matching of the antennas, and the ohmic losses in the antennas and the impedance-matching circuits were clarified. Several observations were obtained, demonstrating the influence on the power-transmission efficiency of the impedance matching and ohmic losses in the wireless power-transmission system associated with near-field coupling.

Original languageEnglish
Article number6309161
Pages (from-to)108-116
Number of pages9
JournalIEEE Antennas and Propagation Magazine
Issue number4
Publication statusPublished - 2012


  • antennas
  • electromagnetic coupling
  • Electromagnetic induction
  • impedance matching
  • power transmission
  • wireless power transfer
  • wireless power transmission


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