A Wideband Conductor Backed Coplanar Waveguide Fed Implantable Antenna Operable in Different Tissues for Biotelemetry Applications

Abstract

A wideband biocompatible implanted antenna is designed for wireless biotelemetry applications at industrial, scientific and medical (ISM) band (2.4-2.48 GHz). The antenna is fed by a conductor backed coplanar waveguide (CB-CPW) structure and two H-shaped slots are etched side by side on the patch of the antenna to create a resonance at the desired frequency. The experimental and simulation measurements are performed by using skin, fat and muscle tissue layers. The impedance bandwidth (S_11≤-10 dB) of the proposed antenna is measured as 0.406 GHz (2.272 - 2.678 GHz), when the fabricated antenna is implanted inside a three-layered human body mimicking gel. By using the advantage of having a wide bandwidth, the designed antenna is analyzed inside different tissue types and tissue thicknesses. For every obtained simulation and experimental result, it is observed that the antenna always covers the ISM band, which is the most significant contribution of this study. The size of the implantable antenna is 16×13×1.93 mm3, where both sides of the antenna is covered by a superstrate material to extend the life of the antenna inside the tissue.