A Miniaturized Triple-Band Implantable Antenna System for Bio-Telemetry Applications

摘要

This communication presents a miniaturized triple band implantable antenna system for multiple biotelemetry applications, which operates at the industrial, scientific, and medical (ISM) band (902–928 MHz and 2400–2483.5 MHz) and the midfield band (1824–1980 MHz). These bands are intended for the function of data telemetry, wireless power transfer, and power saving. The recommended antenna system is comprised of two implantable devices, a capsule type for deep tissue implantation and a flat type for skin implantation. The volume of these devices is 647 mm^{3and 425.6 mm3, respectively. The compact size of the proposed antenna system is 21 mm3($7,,ext {mm} imes 6 ,,ext {mm} imes 0.5$mm), which is the smallest size yet presented. The miniaturization is achieved by meandering the shape of the radiating patch, adding an open-end ground slot, and introducing a shorting pin between ground plane and radiating patch. In the proposed antenna, simulated bandwidth is 8.7% and 7.3% at the ISM bands and 8.2% at the midfield band, and the measured bandwidth in a saline solution is 14.7% and 24.8% at the ISM bands and 13.1% at the midfield band. Finally, a link budget is calculated at different data rates to specify a range for data telemetry.}