Electric coupling in strongly-coupled magneto-inductive cable

Magneto-inductive (MI) waveguides are linear arrangements of magnetically coupled L-C resonators that can propagate RF electrical energy. At resonance, propagation loss is inversely proportional to the coupling coefficients of the elements and to their quality factors. To achieve strong magnetic coupling, the current-carrying sections of adjacent elements must be very close, resulting in parasitic capacitance between elements. Electric coupling is demonstrated theoretically and experimentally in MI cable, and its effect is to introduce multiple propagation bands above the MI band.