Emulating hyperbolic-media properties with conventional structures

Hyperbolic media (media with hyperbolically-shaped dispersion surfaces) possess interesting properties which have inspired numerous application concepts. In this study, we try to identify conventional materials which resemble the behavior of hyperbolic media. We start from biaxial concepts and conclude that a necessary condition for that purpose is the high permittivity contrast between the two axes. Since components with substantial permittivity magnitude are behaving like PEC boundaries, we consider an electrically dense mesh of tilted PEC strips formulating numerous parallel TEM waveguides as a possible substitute to hyperbolic structures. Indeed, this wave-guiding medium is found to exhibit hyperbolic properties via semi-analytical approximations which have been verified by full-wave simulations. The design flexibility provided by the increased independence between the formulated consecutive waveguides can be exploited in a variety of different objectives when controlling electromagnetic fields.

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