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Abstract-In this paper, two dimensional multi-port method is used to analyze substrate integrated waveguide by using Green's function approach to obtain the impedance matrix of equivalent planar structure. Modes propagation constant of substrate integrated waveguide, as a periodic structure, is calculated by applying Floquet's theorem on the impedance matrix of a unit cell. Field distribution of the propagating mode is obtained by this method. Results obtained by this method are verified, in a broad range of dimensions, by comparing with published results and also those calculated by commercial electromagnetic simulator, HFSS. Electromagnetic band gaps and mode conversion phenomenon as properties of periodic structures are also observed and investigated. Mode conversion in SIW is reported for the first time by our proposed method.

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Abstract:In this work, a hybrid neural model (HNM) able to characterize accurately the dispersion behavior of the fundamental T E 10 mode of a single layer SIW waveguide, is developed. The HNM combines the analytical expression that models the dispersion characteristics of this guiding structure, with a Multi Layer Perceptron Neural Network (MLPNN) which operates as an estimator of the cutoff angular frequency ω t of the fundamental mode. The comparison among HNM computations, numerical results obtained with methods proposed in literature and full-wave data validate both the accuracy and the effectiveness of the proposed approach.

This article introduces a simple technique in twodimensional multiport method for analysis of planar circuits. This technique is applicable to configurations which have been analyzed by desegmentation method with electric wall boundary condition at the removed parts. Analysis of planar circuits with metallic vias is performed faster and more accurate by this technique, because there is no need to make the curved electric wall boundary discrete. In addition, proposed method is numerically stable. Substrate integrated waveguide as a planar circuit is analyzed by this technique. Through comparison with related published literatures, the accuracy of proposed technique is confirmed.