Open AccessCoupling between coils in the presence of conducting medium
Author(s) -
Vallecchi Andrea,
Chu Son,
Solymar Laszlo,
Stevens Christopher J.,
Shamonina Ekaterina
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5292
Subject(s) - attenuation , poynting vector , wireless power transfer , inductance , coupling (piping) , conductivity , physics , plane wave , condensed matter physics , inductive coupling , magnetic field , computational physics , acoustics , mechanics , power (physics) , engineering , mechanical engineering , optics , quantum mechanics , voltage
The authors have studied analytically by simulation and by experiment the impact of a conducting medium on the mutual inductance between two coils, in particular as related to the attenuation of magneto‐inductive (MI) waves. To illustrate the physics, the distributions of both the magnetic field and the Poynting vector are determined. They show that the plane wave approach used in the literature for the theoretical description of MI attenuation has only limited validity. It is further found that the mutual inductance becomes a complex quantity, its modulus declining monotonically as a function of conductivity or medium thickness. Their results will be relevant for the design and optimisation of MI waveguide links in conducting media, in general, and particularly when the attenuation is caused by soil conductivity. The results can also be useful for practical applications including in vivo communication and wireless power transfer for medical implants.