Title :
Wideband Tuning of the Tunneling Frequency in a Narrowed Epsilon-Near-Zero Channel
Author :
Mitrovic, Miranda ; Jokanovic, Branka ; Vojnovic, Nebojsa
Author_Institution :
Inst. of Phys., Univ. of Belgrade, Belgrade, Serbia
Abstract :
We propose a design of foam epsilon-near-zero (ENZ) waveguide with E- and H-plane step discontinuities at the same waveguide cross section. This enables using channel dielectric permittivity greater than the permittivity in input waveguides, which is required for foam ENZ waveguide realization. A method for wideband tuning of tunneling frequency by changing the length of two longitudinal slots was also proposed and experimentally verified. Simulated tuning range is 1.06 GHz, which is in a good agreement with experimentally achieved 0.99 GHz. This tuning range is accompanied by amplitude decrease of 1.6 dB.
Keywords :
permittivity; rectangular waveguides; E-plane step discontinuities; ENZ waveguide; H-plane step discontinuities; channel dielectric permittivity; foam epsilon-near-zero waveguide; frequency 0.99 GHz; frequency 1.06 GHz; longitudinal slot length; loss 1.6 dB; narrowed epsilon-near-zero channel; rectangular waveguide; tunneling frequency; waveguide cross section; wideband tuning; ${rm E}$- and ${rm H}$-plane step discontinuity; epsilong-near-zero (ENZ) metamaterial; frequency tuning; rectangular waveguide;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2013.2261046
