For the first time, I characterized the human body as a cylindrical monopole antenna when a small electrical current is applied to the sole of the foot, based on experimental and theoretical results. This involved developing an analytical electromagnetic model and validating the results with experiments. Furthermore, applying analytical and geometrical models, I investigated the novel idea of using the human body antenna for wireless communication of implants embedded in the ankle.
There are many published articles on RF dosimetry; nevertheless, the antenna characteristic of the human body has not been given much attention. To solve this issue, I proposed accurate formulas for the frequency at which the human body absorbs maximum radio power, based on the weight, height and gender as the parameters. The formulas substitute a highly complex computational approach that needs several hours of computation time. For the first time, I also analysed the effect of shoes, since most of the articles on RF dosimetry were based on bare-footed numerical phantoms of the human body. I found that the shoe is a very important factor that affects the amount of absorbed radio power.
I have critically investigated the cylindrical antenna theory, which has been the centre of research for more than a century. After analysing the pioneering works of the early contributors, I derived simple and accurate alternative expressions of the induced electric current in cylindrical (thin wire) dipole antennas of finite conductivity. The expressions significantly reduce the computational effort required when using the conventional formulas. The derived expressions have invaluable significance in the analysis of nanowire and nanotube antennas.
Human Body Communication (HBC), which is also known as Intrabody Communication (IBC), is a relatively new wireless communication technique that uses the human body itself as a communication medium to interconnect wearable electronic devices. In the early studies of HBC, there was a lot of confusion on the mechanism of signal propagation on/in the human body. Within this context, I developed an electrical circuit model of the human body, which was useful to explain the mechanism of electrical signal propagation inside the human body. The model was used to investigate how the dielectric properties of tissues affect the electric current coupled to the human body. Moreover, I have also developed a theoretical electromagnetic model of HBC, which explains signal propagation mechanism on the surface of the body based on the antenna nature of the human body. This model corrected the misconceptions held by several researchers (that the electromagnetic field in HBC is confined in the human body) by demonstrating that there is a large near-field energy in the vicinity of the human body. The theoretical electromagnetic model was derived based on a cylindrical monopole antenna model of the human body.