A Compact Implantable Antenna for Brain Computer Interface Application at ISM Band

Implantable Brain Computer Interfaces (BCIs) are intended to investigate brain function, send control signals for prosthetic devices in real time, and/or replace lost sensory data due to illness or injury. In this paper, brain implanted antenna designs, analysis, and simulations are presented for Brain Computer Interface (BCI) application. Small implantable antennas frequently exhibit omnidirectional radiation patterns, making them unsuitable for use in in-to-out wireless body area networks. This issue is resolved by the suggested design, which alter the antenna structure inside a realistic brain implant scenario, a seven-layer brain phantom that consists of Dura, Bone, Fat, Skin, Cerebrospinal fluid (CSF), Grey, and White matters. The antenna is round measuring 9.88mm in radius and 0.5 mm in thickness. After modeling the seven-layer phantom using full-wave simulation software HFSS, the antenna was inserted in the dura layer (top of the head). The antenna was tuned such that it would radiate widely at a resonating frequency of 2.4 GHz. Taconic RF-35, a biocompatible PCB material with low loss, was used to create the optimal antenna design. Compared to conventional implantable single band antennas which are operating at 2.4 GHz, the suggested antenna has a broader −10-dB impedance bandwidth of 17.24% and simulated peak realized gain of −21dB. In addition, the specific absorption rate (SAR) was computed and evaluated for accordance with IEEE safety criteria.