Analysis of substrate integrated waveguide based on two dimensional multi-port method

In this article, two-dimensional analysis is proposed to calculate propagation constant of substrate integrated waveguide. First, the impedance matrix of a unit cell structure of substrate integrated waveguide is calculated by employing desegmentation method. Then, propagation constant of fundamental mode is obtained by applying Floquet theorem on the impedance matrix of the unit cell. Field distribution of the propagating mode is also acquired. Our results show good agreement with published results. Comparison with results obtained by high-frequency structure simulator validates this method for a broad range of dimensions.