waveguide discontinuity

waveguide discontinuity

[′wāv‚gīd dis‚känt·ən′ü·əd·ē]
(electromagnetism)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The number of modes which have to be taken into account is small, as higher order modes excited at a waveguide discontinuity decay quickly and can be neglected.
Considering the coupling section as a waveguide discontinuity, the excitation of a quasi-resonant TEM mode affects the average return loss over the band, making its adjustment more complicated.
Moreover, some theoretical analyses of problems involving metamaterials have shown that simple frequency-domain waveguide discontinuity problems can be ill-posed [24] even in the presence of lossy media and of absorbing boundary conditions [23].
Accordingly, the proposed stabilization algorithm is preliminary numerically validated (by exploiting a commercial FE solver [30]) against a wide set of electromagnetic problems belonging to two canonical classes: a waveguide discontinuity problem, and a multi-layer sphere scattering problems.
Indeed, it has been recently demonstrated that waveguide discontinuity problems can become ill-posed even in the presence of lossy media and absorbing boundary conditions [23].
[24.] Raffetto, M., "Ill posed waveguide discontinuity problem involving metamaterials with impedance boundary conditions on the two ports," IET Proc.
To overcome this limitation, a mode-matching method was developed that considers all normal modes generated at the discontinuity.[3,4] In general, this method can be applied to any type of waveguide discontinuity.