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New NRD-waveguide Devices Using Metamaterials

Topa, A. ; Paiva, C. R. ; Barbosa, A.

New NRD-waveguide Devices Using Metamaterials, Proc Progress in Electromagnetics Research Symp. - PIERS, Moscow, Russia, Vol. 1, pp. 1 - 1, August, 2009.

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Abstract
The electromagnetic wave propagation along waveguiding structures containing
metamaterials has been subject to intense investigation in the last years, due to their potential
application to microwave and millimeter-wave devices. One of the most promising metamaterials
is the double-negative (DNG) medium, where both the electric permittivity and the magnetic
permeability can be negative in a given frequency band. Within this topic, a great variety of
waveguides has been revisited.
The non-radiative dielectric (NRD) waveguide is a very popular technology in the millimetre-
wave integrated circuit regime [1]. This paper addresses the issue of the electromagnetic char-
acterization of NRD waveguiding structures where the common dielectric slab is replaced by a
metamaterial slab. NRD waveguides involving DNG metamaterials have been already addressed
in the literature [2{5], but the analysis has been mostly limited to its modal characterization.
The main goal of this work is to show new applications of this type of waveguides when DNG
metamaterials are involved. In fact, new e®ects produced by the introduction of metamaterial
may suggest potential applications. For example, the propagation of leaky modes is investi-
gated [6] and its application is envisaged. On the other hand, it is shown that, in the presence
of small losses, this type of waveguides may exhibit sharp narrow passbands, hence suggesting
its application in the design of waveguiding ¯lters [7]. The full-wave analysis of a DNG-NRD
directional coupler is also presented. New propagation characteristics, such as contra-directional
coupling [2], are reviewed in detail. New unusual features may provide physical insight into other
waveguide geometries, with potential applications in the design of new devices and components