Numerical Modeling of Electromagnetic Wave Propagation Through Bi-Isotropic Materials

As part of the present wave of interest in electromagnetic propagation in complex materials (left-handed, chiral, nonreciprocal, nonlinear, etc.), a special mention may be made to bi-iso‐ tropic materials. After a period of relevance during the nineties [1-4], nowadays they enjoy a renewed interest, because of new fabrication techniques that allow the use of mature tech‐ nologies (printed or integrated circuit) [5,6], and also the discovery of new properties associ‐ ated to the bi-isotropy, such us the presence of negative refraction index [6-11]. In order to study electromagnetic wave propagation in such materials, different traditional numerical methods, both in time and frequency domain, have been extended so that they may deal with additional constitutive parameters, as well as their inherently dispersive. This last point is especially important when dealing with time-domain methods, in which the fre‐ quency dispersion must be translated to time-domain.