An RFID-based closed-loop wireless power transmission system for biomedical applications

Mehdi Kiani, Maysam Ghovanloo

Research output: Contribution to journalArticlepeer-review

127 Scopus citations


This brief presents a standalone closed-loop wireless power transmission system that is built around a commercial off-the-shelf (COTS) radio-frequency identification (RFID) reader (TRF7960) operating at 13.56 MHz. It can be used for inductively powering implantable biomedical devices in a closed loop. Any changes in the distance and misalignment between transmitter and receiver coils in near-field wireless power transmission can cause a significant change in the received power, which can cause either a malfunction or excessive heat dissipation. RFID circuits are often used in an open loop. However, their back telemetry capability can be utilized to stabilize the received voltage on the implant. Our measurements showed that the delivered power to the transponder was maintained at 11.2 mW over a range of 0.5 to 2 cm, while the transmitter power consumption changed from 78 mW to 1.1 W. The closed-loop system can also oppose voltage variations as a result of sudden changes in the load current.

Original languageEnglish (US)
Article number5446413
Pages (from-to)260-264
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number4
StatePublished - Apr 2010

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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