TE AND TM MODES IN CYLINDRICAL METALLIC STRUCTURES FILLED WITH BIANISOTROPIC MATERIAL

Modal propagation is studied for metallic circular waveguides, coaxial cables and sectoral waveguides filled with linear bianisotropic mater ial, By representing the material constitutive tensors in cylindrical coordinates, the conditions under which TE and TM modal decoupling occ urs are obtained, and second-order differential equations for the long itudinal field components are derived, Though the TE and TM longitudin al field components are expressible in terms of hypergeometric functio ns, a complete numerical solution scheme is, in general, more convenie nt, Conventional application of finite elements renders the differenti al problem numerically equivalent to a generalized eigenvalue matrix p roblem, whose solution yields the dispersion relation and cutoff frequ encies of the waveguides together with the eigenfields expression, The effects one can obtain by varying the various coefficients of the con stitutive tensors are illustrated by several numerical results.