Analysis of coupled microstrip lines on a layered substrate containing a metal ferromagnetic film

A method is described for the numerical analysis of the fundamental electromagnetic waves in an open planar multiconductor transmission line on a layered substrate containing a thin metal ferromagnetic film. Matrices of the inductance and capacitance per unit length of the strip conductors are obtained via rigorous solution of 2D magnetostatic and electrostatic boundary-value problems. Formulas for calculation of the phase velocities of quasi-TEM modes and corresponding amplitudes of currents and voltages on the strip conductors are derived.