Abstract
In this paper, we present a mode-matching-based formulation for the electromagnetic analysis of multifurcated waveguide problems, that is, the junction of a number of input waveguides with an output region of larger cross-section area. A generalized scattering matrix (GSM) representation is obtained for relating the forward and backward modal field amplitudes in each of the waveguides in terms of coupling integrals representing the conservation of the reaction of the electromagnetic fields. Numerical results for several multifurcated coaxial waveguide devices are provided to validate the formulation. Comparisons against the finite-element method demonstrate that the present approach can accurately model multifurcated waveguide problems. The method introduced here provides useful matrix formulas that allow us to model multi-port waveguide devices by reusing well-known coupling integrals of two-port problems.
Highlights
The mode-matching technique (MMT) is an efficient method frequently employed in the designing of microwave devices, such as filters, impedance-matching transformers, power dividers, and couplers
We will compare the results of the present approach with those obtained by a frequency-domain finite-element method (FEM) from CST [27]
We investigated the reflection coefficient of the transverse electromagnetic (TEM) modes in each waveguide as a function of the frequency, and in order to assess the effect of high-order modes, we have selected the frequency range of 10 GHz–50 GHz
Summary
Abstract− In this paper, we present a mode-matching-based formulation for the electromagnetic analysis of multifurcated waveguide problems, that is, the junction of a number of input waveguides with an output region of larger cross-section area. A generalized scattering matrix (GSM) representation is obtained for relating the forward and backward modal field amplitudes in each of the waveguides in terms of coupling integrals representing the conservation of the reaction of the electromagnetic fields. Numerical results for several multifurcated coaxial waveguide devices are provided to validate the formulation. Comparisons against the finite-element method demonstrate that the present approach can accurately model multifurcated waveguide problems. The method introduced here provides useful matrix formulas that allow us to model multi-port waveguide devices by reusing well-known coupling integrals of two-port problems. Index Terms− Generalized scattering matrix, mode-matching technique, multifurcated waveguide
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