Computer-Aided Renormalized Perturbation - Method for the Inhomogeneously Loaded Waveguide (Correspondence)

The renormalized perturbation method is applied to the inhomogeneously loaded waveguide. The second-order term in the usual Rayleigh-Schrodinger perturbation method is divergent with respect to increasing the concerned mode number. Introducing the phenomenological parameter by analogy to the quantum electro-dynamics, we have the nondivergent second-order perturbation term.