Fields and coupling between coils embedded in conductive environments
Department of Engineering Science, University of Oxford,
OX1 3PJ, UK
* e-mail: firstname.lastname@example.org
Accepted: 17 November 2017
Published online: 23 February 2018
An approximate solution is developed for the mutual inductance of two circular coils enclosed by insulating cavities in a conducting medium. This solution is used to investigate the variation of the mutual inductance upon the conductivity of the background (e.g., soil, seawater or human body), as well as upon other parameters such as the vertical of the coils and the displacement of one of the coils in the horizontal plane. Our theoretical results are compared with full wave simulations and a previous solution valid when a conductive slab is inserted between two coupled resonant coils. The proposed approach can have direct impact on the design and optimisation of magnetoinductive waveguides and wireless power transfer for underground/underwater networks and embedded biomedical systems.
Key words: Coils / conducting materials / mutual inductance / magnetic fields / eddy currents / magnetoinductive waves / wireless underground / underwater communications networks
© S. Chu et al., published by EDP Sciences, 2018
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