Optimized Rectenna Design for Wireless Power Transfer in Implantable Systems

The integration of radio frequency (RF)-based wireless power transfer (WPT) systems into implantable medical devices (IMDs) represents a transformative step toward realizing fully autonomous, battery-free biomedical implants. This study presents the design, simulation, and optimization of a miniatur...

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Bibliographic Details
Published inDevices for Integrated Circuit pp. 772 - 777
Main Authors Islam, Akib Jayed, Salehin, Sultanus, Pranta, Swapnil, Barua, Nirzar, Pavel, Tanvir A., Uddin, Arafat, Ananna, Kaniz Fatema
Format Conference Proceeding
LanguageEnglish
Published IEEE 05.04.2025
Subjects
antenna
bio-case model
Biological system modeling
Energy harvesting
Implants
Integrated circuit modeling
ISM band
Physiology
rectenna
Rectennas
rectifier circuit
Rectifiers
RF-DC conversion
Safety
skin & muscle tissue
Specific absorption rate
Wireless power transfer
Online AccessGet full text
ISSN2996-3044
DOI10.1109/DevIC63749.2025.11012166

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Summary:The integration of radio frequency (RF)-based wireless power transfer (WPT) systems into implantable medical devices (IMDs) represents a transformative step toward realizing fully autonomous, battery-free biomedical implants. This study presents the design, simulation, and optimization of a miniaturized implantable rectenna operating at the 2.4 GHz ISM band, aimed at addressing the critical challenges of power delivery, biocompatibility, and electromagnetic safety. A multi-layered human tissue phantom model incorporating realistic dielectric properties is developed to assess in-situ antenna performance and ensure compliance with specific absorption rate (SAR) regulations. The antenna is geometrically optimized for low return loss, minimal volume, and efficient power harvesting under physiological constraints. Concurrently, the rectifier circuit is designed using harmonic balance analysis in ADS, with various diode models evaluated for maximizing RF-to-DC conversion efficiency. The proposed system achieves a peak efficiency of 88.65%, with SAR values maintained well below regulatory limits across multiple implant positions. These findings underscore the potential of the proposed rectenna architecture to enable safe and efficient wireless powering of next-generation IMDs, thereby advancing the frontier of biomedical telemetry and implantable electronics.
ISSN:2996-3044
DOI:10.1109/DevIC63749.2025.11012166