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Abstract
A simple, efficient and rapidly convergent algorithm for evaluating the cutoff wavenumbers and the field of propagating modes inside circular waveguides with one or two inner strip conductors is presented. The formulation leads exactly to a Carleman-type singular integral equation (S.I.E.) for the surface current density (-ties) on the strip(s); the solution is based on Neumann's expansion of the Hankel-function kernel of the S.I.E. and is particularly suited for wide as well as narrow strips. Numerical results for the cutoff wavenumbers, both TM and TE, are presented for various waveguiding configurations and the efficiency of the algorithm is amply demonstrated.