CUTOFF AND PHASE CONSTANTS OF PARTIALLY FILLED AXIALLY MAGNETIZED, GYROMAGNETIC WAVE-GUIDES USING FINITE-ELEMENTS

A three component vector finite element formulation to model the propa gation characteristics of partially filled, axially magnetized, gyroma gnetic waveguides is described. Covariant-projection elements have bee n used to avoid spurious modes and periodic boundary conditions have b een implemented to improve numerical efficiency. The classic quadratic functional derived from the vector, curlcurl, magnetic field equation is suited to evaluating the cut-off planes of gyrotropic waveguides. A known field transformation is used to reformulate the functional int o a form convenient for calculating phase constants. Cut-off and phase constant solutions are presented for both fully and partially filled, longitudinally magnetized, ferrite loaded waveguides.