Multimode Quasistatic Cavity Resonators for 3-D Wireless Power Transfer

(a) and (b) show the current of the two resonant modes of the multimode-QSCR. (c) shows the "efficiency vs position" plot in single mode operation (conventional method), whereas (d) shows the "efficiency vs position" plot in dual mode operation (proposed method).

Wireless power transfer (WPT) using quasistatic cavity resonators (QSCR) proposed a route towards truly ubiquitous WPT, which allows devices to be safely charged as they enter a WPT enabled space. However, there are still several drawbacks to this approach such as the need for a conductive pole in the middle of the cavity and the non-uniform magnetic field intensity. To address these issues, this study proposes multimode QSCR, which enables pole-less operation and control of magnetic field distribution.



  1. T. Sasatani, M. J. Chabalko, Y. Kawahara, and A. P. Sample, “Multimode Quasistatic Cavity Resonators for Wireless Power Transfer,” IEEE Antennas and Wireless Propagation Letters, vol. 16, pp. 2746-2749, 2017. [PDF]
  2. T. Sasatani, A. P. Sample, and Y. Kawahara, “Demo: 3-D Wireless Charging for Indoor Electronics Using Multimode Quasistatic Cavity Resonators,” Adjunct Proc. of ACM Ubicomp 2018, Singapore, Oct. 2018.
  3. T. Sasatani and Y. Kawahara, “Multimode Quasistatic Cavity Resonators for Wireless Power Transfer: Towards Empowering Freely Moving Animal Experiments in 3-D Environments,” International Symposium on Systems Science of Bio-Navigation 2018, To Appear, Kyoto, Japan, Sept. 2018.
  4. 笹谷拓也,川原圭博,“三次元無線電力伝送のためのMultimode Quasistatic Cavity Resonatorの実装,” 電子情報通信学会 ソサイエティ大会,Sept. 2018.

[Left] Implemented Scale-model of multimode QSCR. [Right] Demonstration of a miniaturized-scale, wirelessly powered room. All the LEDs are wirelessly powered.