Novel Implantable Disk DRA for Bio-Telemetry Applications at 2.4 GHz ISM Band

In this paper, a novel circular disk implantable Dielectric Resonator Antenna (DRA) working at 2.4 GHz ISM band for bio-telemetry applications is proposed. DRAs have advantages of no metallic losses and high efficiency in comparison to their counterparts patch antenna which is a significant benefit in implantable antenna. Metallic implants pose serious problems due to various reasons such as induced current, heating, and resistance in MRI, X-Ray, ECG. Proposed DRA is made up high dielectric constant material (TiO2) and excited by a unique circular L-shaped feedline with defected ground structure (DGS). Simulated impedance bandwidth of proposed antenna covers the entire 2.4 GHz ISM Band (2.40 GHz-2.4832 GHz). A flexible, thermally stable, bio-compatible layer of Polydimethylsiloxane (PDMS) is allowed on the surface of the whole structure. Antenna performance is observed under 20 mm depth in male right arm phantom in EM simulator HFSS. Maximum Antenna gain in broadside direction measured is −18 dBi inside the phantom and radiations are within permissible SAR limits. The proposed antenna is a suitable candidate for bio-telemetry applications in the ISM band.