Related Experiment Video
Updated: Jun 18, 2026
08:25
Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
Published on: August 27, 2021
A closed loop wireless power transmission system using a commercial RFID transceiver for biomedical applications
Mehdi Kiani1, Maysam Ghovanloo
1School of Electrical and Computer Engineering at Georgia Institute of Technology, Atlanta, USA.
Summary
This study introduces a closed-loop wireless power system using RFID transceivers for stable power delivery to biomedical implants. It maintains consistent power despite distance and load changes, enhancing device safety and reliability.
Area of Science:
- Biomedical Engineering
- Electrical Engineering
- Wireless Power Transfer
Background:
- Near-field wireless power transmission is crucial for implantable biomedical devices.
- Variations in distance and misalignment can cause power fluctuations, leading to device malfunction or overheating.
- Existing radio frequency identification (RFID) systems are often open-loop, lacking power stabilization.
Purpose of the Study:
- To develop a closed-loop wireless power transmission system for implantable biomedical devices.
- To utilize RFID back telemetry for stabilizing received voltage.
- To ensure consistent and safe power delivery to medical implants.
Main Methods:
- A closed-loop system was designed around a commercial off-the-shelf RFID transceiver (MLX90121) operating at 13.56 MHz.
- The back telemetry capability of the RFID transceiver was leveraged for voltage stabilization.
- Measurements were conducted to assess power delivery range and stability under varying conditions.
Main Results:
- The system maintained a delivered power of 1.48 mW to the transponder over a distance of 6 to 12 cm.
- Transmitter power consumption varied significantly (0.3 W to 1.21 W) while maintaining stable power delivery.
- The closed-loop system effectively compensated for voltage variations due to sudden load current changes.
Conclusions:
- The developed closed-loop system provides stable wireless power for biomedical implants using RFID technology.
- The system enhances safety and reliability by mitigating power fluctuations and opposing voltage variations.
- This approach offers a robust solution for powering implantable medical devices wirelessly.
