Analysis of substrate integrated waveguide structures using contour integral equation

This paper presents analysis of substrate integrated waveguide (SIW) structures using contour integral equation method. By ignoring the field variation in vertical direction, the SIW structure is decomposed into internal and external problems. The internal electromagnetic (EM) fields are governed by the contour integral equation, while the external EM fields are computed from the equivalent magnetic currents along the periphery of SIW. Different from most existing SIW analysis methods, the proposed method is able to calculate the radiation from the periphery of SIW, and it is applicable to the analysis of SIW antennas. The proposed method is validated against alternative methods, and its advantages are demonstrated by comparison with commercial software.