Selection of Suitable Inorganic/Organic Substrate for In-Body Antenna Implants: Impact on Antenna Characteristics in Deep Tissue Environment

Abstract

This paper is primarily aimed at choosing the suitable biocompatible substrate for in-body implantable antennas from a pool of commercially available inorganic polymer ceramics, polymides and organic substrate material. We first consider an in-body antenna at 2.45 GHz, and then optimize it without body phantom, for range of substrate relative permittivity variation 2.5< εr < 30. After integrating the antenna with body phantom, we monitor the antenna reflection coefficient, maximum permissible radiated power, as well as specific absorption rate (SAR) in the tissue, in order to formulate a strategy for suitable substrate material selection in Wireless Implantable Medical Devices (WIMDs)