Simulation of Implantable Miniaturized Antenna for Brain Machine Interface Applications

摘要

Due to the limited size of antenna and electromagnetic loss of human head tissue, implantable miniaturized antennas suffer low radiation efficiency. This work presents simulation and analysis of implantable antennas for a wireless RF-powered brain machine interface applications. The accuracy and stability of antenna input impedance simulation are presented. The effects of the implanted antenna's insulating layers and position within the human brain on the antenna's input impedance, frequency bandwidth, and power transmit are studied. The results show that thin (on the order of 100 micrometers thickness) insulating layer can significantly impact the antenna performance. Proper selection of electrical properties of insulating layers and position inside human head tissues can facilitate efficient RF power reception. While the results show that the effects of the human head shape on antenna performance is somewhat negligible, the electric properties of the tissues surrounding the implanted antenna can significantly impact the electrical characteristics (efficiency, input impedance, and operational frequency) of the implanted antenna.