Radio frequency wireless power transfer to chip-scale apparatuses

Liuqing Gao, Yansong Yang, Arakawa Brandon, Justin Postma, Songbin Gong

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper reports a design methodology for a tri-coil system that can wirelessly transfer power from a macro-scale probe to a chipscale apparatus over a long distance and with a high efficacy. Such systems can be employed for enabling the wireless charging and communication between implanted body sensors and smart phones as well as between hardware roots of trust and their interrogation probes. A design example has been offered and subsequently validated by an experimental testbed consisting of micro-fabricated coils on both sides of a Silicon substrate. As predicted by the analytical models, the measured power transfer efficacy (PTEF) of the designed system is as high as -27 dB at the resonance, confirming an orders-of-magnitude higher PTEF than that of prior WPT systems over a distance greater than 5 times the coil diameter.

Original languageEnglish (US)
Title of host publication2016 IEEE MTT-S International Microwave Symposium, IMS 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509006984
StatePublished - Aug 9 2016
Event2016 IEEE MTT-S International Microwave Symposium, IMS 2016 - San Francisco, United States
Duration: May 22 2016May 27 2016

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Other2016 IEEE MTT-S International Microwave Symposium, IMS 2016
CountryUnited States
CitySan Francisco


  • Wireless Power Transfer
  • inductive
  • near field
  • on chip coils
  • resonance

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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