Design and Analysis of a Dual Radial MIMO Implantable Antenna for WMTS Applications

This research presents a meticulously engineered dual-port, dual-radial implantable MIMO (Multiple Input Multiple Output) antenna specifically designed to operate within the 1.39-1.42 GHz frequency band of the Wireless Medical Telemetry System (WMTS). The proposed antenna, with compact dimensions of 19 × 19 × 1.27 mm³, utilizes Rogers RO6010 as both substrate and superstrate, featuring a dielectric constant (εr) of 10.2, a thickness of 0.635 mm, and a loss tangent of 0.0023. The design achieves high isolation (> 20 dB) between antenna elements, ensuring minimal mutual coupling, enhanced signal integrity, and reduced interference in implantable biomedical communication environments. The antenna demonstrates excellent performance metrics including a low Envelope Correlation Coefficient (ECC < 0.1), signifying robust signal decorrelation and high data reliability. Furthermore, the diversity gain (DG) approaches 10 dB, improving reception diversity and mitigating multipath and fading issues. Despite its compact and low-power design, the antenna achieves a peak gain of -28 dB and a measured channel capacity (CC) of 8 bps/Hz, indicating suitability for high-data-rate applications. Fabrication and measurement results exhibit strong agreement with simulated data, confirming the proposed antenna's practical feasibility for next-generation biomedical implant communication systems.