Reflectionless Sharp Bends and Corners in Waveguides Using Epsilon-Near-Zero Effects
; Alù, A
Silveirinha, M. G.
; Engheta, N.
Journal of Appl. Physics Vol. 105, Nº -, pp. 044905 - -, February, 2009.
ISSN (print): 0021-8979
ISSN (online): 0021-8979
Journal Impact Factor: 2,201 (in 2008)
Digital Object Identifier: 10.1063/1.3074506
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Following our recent theoretical and experimental results that show how zero-permittivity
metamaterials may provide anomalous tunneling and energy squeezing through ultranarrow
waveguide channels, here we report an experimental investigation of the bending features relative
to this counterintuitive resonant effect. We generate the required effectively zero permittivity using
a waveguide operating at the cutoff of its dominant mode, and we show how sharp and narrow bends
may be inserted within the propagation channel without causing any sensible reflection or loss and
without affecting its tunneling properties.