TE-waves in waveguide structures filled with graded dielectric media

Graded dielectric media composites, with negative-index materials (NIM), are of interest for various applications such as microwave graded-index (GRIN) lenses [1, 2], wideband THz filtering [3], and enhanced energy harvesting [4]. Graded dielectric media with regular positive-index materials are also of importance in e.g. the field of biosensing. One example is mimicking of dielectric phantoms for the characterization of biological tissue’s properties and response to electromagnetic radiation [5, 6].