Body-Area-Network antennas : green’s functions, numerical analysis and design
(2012)
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- Authors
- Supervisors
- Craeye, Christophe
- Abstract
- (en) With the rapid expansion of wireless technologies such as wireless on-body sensors, mobile devices, and wireless implants, there is a growing need to investigate the effect of human presence on the wireless communication channel. We use the electromagnetics fundamentals to model the interaction of antennas located very close to the human body, represented as a simplified cylindrical model. As a first step, the propagation trends due to an infinitesimal current source with arbitrary polarization are studied inside and outside the body. For sources with tangential-to-cylinder polarization, cylindrical wave decompositions provide the harmonics of incident fields. In case of normal-to-cylinder sources, the related boundary conditions cannot be satisfied and we derive the cylindrical wave decomposition of fields from a proposed modified addition theorem. In the second part, an in-house MoM (Method of Moment) code is developed to find the excited and coupled current distributions on two dipole antennas located very close to the cylinder. A very good agreement has been obtained between the dipole transmittances provided by the analytical/MoM model, CST Microwave Studio simulations, and experiments, including interference effects attributed to the body-attached radiating waves. Afterwards, a Parseval type transform is applied to cylindrical field harmonics to extract a compact and easy equation to find the power absorption, for normal, vertical, and horizontal polarizations of the source. Finally, a compact antenna is designed that can radiate a maximum of power along the body surface. It allows the excitation of surface waves that can carry energy along the surface of the body and maximize the coupling between antennas.
- Affiliations
Citations
Keshmiri, F. (2012). Body-Area-Network antennas : green’s functions, numerical analysis and design. https://hdl.handle.net/2078.5/162806