7.1. Biomedical Implant

The environment in which biomedical implant devices are located is characterized by a high dielectric permeability and a high loss factor to disrupt the electromagnetic signal [60].

Cheng et. al. investigated optimization of a solenoid type receiver coil for biomedical implants in order to create a WPT link. Analytical model of solenoid coil that includes the impact of tissue and coating around the coil was done. A four-turn coil had better results with 0.233 mm pitch at 700 MHz after a pitch optimization. An accurate formulation for the RLC model of implanted solenoid coil. The formulation was valid below self-resonance frequency of Rx coil [14].

2015	Electrically small loop antennas for RFID applications
2017	Analytical modeling and optimization of small solenoid coils for millimeter-sized biomedical implants