Abstract
MODALMETHODANALYSISOFMULTILAYEREDCOATEDCIRCULARWAVEGUIDEUSINGAMODIFIEDCHARACTERISTICEQUATIONF.-G.Hu,C.-F.Wang,Y.Xu,andY.-B.GanTemasekLaboratoriesNationalUniversityofSingapore10KentRidgeCrescent,Singapore119260Abstract—In this paper, the modal method is applied to analyzecoated circular waveguide terminated by a perfect electric conductor(PEC) plate. The key to this method is the accurate calculationof the propagation constants of modes in coated circular waveguide.To overcome numerical difficulties, such as overflow, encountered insolvingcharacteristicequation,thecharacteristicequationismodifiedusing Hankel function of the second kind instead of Bessel functionof the first kind in the coated layers. The modified characteristicequationcanbeaccuratelysolvedtoobtainthepropagationconstantseven for very large circular waveguide with highly lossy coatings.To verify the modified characteristic equation, the attenuationand scattering property of circular waveguide structure have beensimulated. Simulationresultsagreewellwiththereferenceresults.1 Introduction2 CharacteristicEquationanditsModification3 ScatteringAnalysisofCircularCoatedWaveguide4 NumericalResults5 ConclusionsReferences
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