A Miniaturized Multi-Resonant Planar Antenna Design for Implantable Medical Devices

This paper proposes a novel, miniaturized implantable antenna design tailored for biomedical applications. The antenna is designed to operate in dual frequency bands, specifically the Medical Implanted Communication Service (MICS) (402–405 MHz) and the Industrial, Scientific, and Medical (ISM) (902–928 MHz). The compact size of the proposed antenna is 127 mm³(10 mm × 10 mm × 1.27 mm). The dual-band functionality is achieved through the integration of a shorting pin, a meandered resonator design, and the use of a superstrate. Performance evaluation indicates acceptable peak gains values, reaching -38.7 dBi at the lower band and -34.49 dBi in the higher band. Moreover, the performance of the antenna is verified by experiments using saline solution. The results demonstrate a substantial degree of correlation and consistency between the measurements and simulations.

I. Introduction

Implantable medical devices (IMDs) have expanded the scope of healthcare interventions by enabling advanced diagnostics, therapies, realtime monitoring, and targeted drug delivery, thereby sparking significant scholarly interest in the advancement of implantable antennas [1]. When designing such antennas, some key indexes should be considered, such as miniaturization, bandwidth, radiation efficiency, gain, and the specific absorption rate (SAR) [2].