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FDTD modeling of transient microwave signals in dispersive and lossy bi-isotropic media

We present a novel Finite Difference Time Domain (FDTD) model of transient wave propagation in general dispersive bi-isotropic media with losses. The special properties of these materials may lead to new applications in microwave and millimeter-wave technology. While their frequency domain properties have been well described in the literature, their time domain behavior has only been modeled so far for special sub-classes and monochromatic time dependence. We have validated our method by first computing time-harmonic wave propagation through a bi-isotropic medium and comparing it with theoretical results. Agreement is typically better than one percent. Then we have computed transient field propagation in a general dispersive bi-isotropic medium.