Design improvement and performance comparison of an existing slot dipole bendable antenna for biomedical applications

In this paper, the performance comparison of an existing slot dipole flexible bendable antenna is carried out with a newly modified design, featuring balanced size miniaturization for implantable wireless communications. By introducing a minuscule dimension along with the use of low cost substrate and patch material, this proposed antenna has a heightened reliability and feasibility in turns of performing for biomedical applications. The proposed antenna is designed to operate in the Industrial, Scientific and Medical (ISM) band (2.4-2.4835 GHz). ISM band has been chosen because of its docility towards higher bandwidth with the decreasing size of antenna. The proposed antenna is designed for both planar and bendable scenarios. Silicon with thickness of 625μm is used as the biocompatible layer to encapsulate the antenna, giving a packed dimension of 65.57mm3(12.55mm × 0.625mm × 8.36mm). The antenna is also immersed inside a human tissue model where all the electrical properties of the human tissue were maintained to study the sensitivity of the antenna's performance when subjected to in-body conditions. With the antenna inside the human tissue model, all its performance parameters are studied both in planer and bent cases. Finally, the Specific Absorption Rate (SAR) is evaluated to test whether the antenna is safe to be implanted inside a living body.