An Implantable Antenna Design for an Intelligent Health Monitoring System Considering the Relative Permittivity and Conductivity of the Human Body

In this paper, an intelligent health monitoring system based on body-centric wireless communications is studied, and implantable antennas are investigated. To design antennas for an intelligent health monitoring system, the effects of the relative permittivity and conductivity of a human body equivalent liquid on an implantable antenna are investigated via electromagnetic analysis. Two types of capsule antennas, an isolated type capsule antenna, and a surface type capsule antenna, are investigated and compared. An inner-layer implantable capsule dipole antenna with the characteristics of both a large effective electrical length and a small transmission loss is proposed. The methodology of the designed capsule antenna that obtains a maximum received power at 500 MHz by changing the internal impedance is also presented.