LOCAL-MODE ANALYSIS OF CONTINUOUS TRANSITIONS IN RECTANGULAR WAVE-GUIDES

A local-modes technique is employed for the rigorous full-wave compute r-aided analysis of rectangular waveguide components with continuous v ariations of the transverse cross section along the propagation direct ion. Fields in the varying waveguide sections are expanded as a sum of the modes of the locally straight waveguide, which, as a result of th e longitudinal variations, are coupled to each other; the coupling coe fficients depend on the transition geometry and are easily evaluated a nalytically. The technique offers considerable efficiency and is parti cularly suitable for the CAD of a large class of waveguide components like tapers, mitered bends, transitions, etc. Examples of applications and comparisons with reference data are illustrated for the case of H -plane transitions in rectangular waveguides. (C) 1998 John Wiley & So ns, Inc.