A Novel Analysis of Rectangular Dielectric Waveguides Using an Interior-Exterior Integral Equation Technique

In this paper, we apply a modified integral equation technique to analyze rectangular dielectric waveguides with elimination of spurious modes. The two stage method applies interior problem by modal analysis to access the electric field in the waveguide in terms of the electric field on the boundaries. The exterior problem can be solved by integral equation technique to calculate the boundary fields regarding to interior fields. Using this approach, the eigen value problem can be formulated by finding the zeros of the relating determinant. Eliminating the spurious modes, the zeros of each mode are distinctly distinguishable. The consequent dispersion diagram is also has good agreements with the results of other methods for rectangular dielectric waveguide.