Development of a Biocompatible Dual-Band Implantable Antenna with Optimized SAR Reduction Techniques for Wireless Transmission of Cardiac and Neural Diagnostics Data
DOI:
https://doi.org/10.31838/NJAP/07.03.24Keywords:
Implantable antenna, SAR optimization, dual-band telemetry, biocompatible encapsulation, neural diagnostics, MICS bandAbstract
Medical implantable devices are strongly dependent on the use of small antennas that have the capability of operating in the dual band and at a stable rate to provide continuous cardiac and neural telemetry. The tissues of humans however present a powerful dielectric loading which leads to impedance detuning, low gain as well as high specific absorption rate (SAR). This is an article that describes a biocompatible dual-band implantable antenna that is designed to achieve stable Medical Implant Communication Service (MICS) and Industry, Scientific, and Medical (ISM) band functionality. A multilayer scheme using a high-permittivity radiator, parylene-C encapsulation and an electromagnetic bandgap (EBG)-based assisted SAR reduction set up is suggested. The visualisation of the system behaviour is represented by figures about 3D structure, layer distribution, S11 response, SAR maps, and radiation patterns. The design is supported by a mathematical model of reliability and an iterative SAR optimization algorithm. Simulations with electromagnetic models of realistic multilayer human tissues show an improved stability of impedance, low SAR, and better gain as compared to reference designs. The antenna facilitates strong wireless communication of the cardiac electrograms and neural activity signals at variable depths of implantation. This contribution further supports the development of the design of biocompatible, safe, and high-performance antennas to be used in long-term implantable diagnostics.
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