Open AccessGeneralised asymptotic boundary conditions and their application to composite right/left‐handed rectangular waveguide with double‐ridge corrugations
Author(s) -
Kord Ahmed M.,
Eshrah Islam A.
Publication year - 2014
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2013.0326
Subject(s) - ridge , waveguide , modal , boundary value problem , left handed , boundary (topology) , composite number , mathematical analysis , dispersion (optics) , range (aeronautics) , dispersion relation , optics , field (mathematics) , mathematics , geometry , materials science , physics , geology , composite material , paleontology , pure mathematics
A generalised form of the asymptotic corrugation boundary conditions (ACBCs) is presented and employed to analyse a composite right/left‐handed rectangular waveguide loaded with double‐ridge stubs. Enforcing the ACBCs yields the dispersion relation as well as the field distribution in the main waveguide without the need for any sophisticated modal analysis. The asymptotic solution proves to provide accurate results within a wide frequency band. The effect of the various geometrical parameters and the aspect ratios is investigated to determine the range of validity of the ACBCs. The results compared with the full‐wave simulations exhibit very good agreement.