The influence of periodic discontinuities on propagation characteristic of substrate integrated waveguide

Substrate integrated waveguide is a planar circuit with periodic discontinuities. Periodicity of the structure results to electromagnetic band gaps. Moreover due to higher order modes generation, mode conversion phenomenon happens in the structure at some specific frequencies. In this article, two dimensional multiport method is used to analyze substrate integrated waveguide. As the results show, mode conversion and classical electromagnetic band gaps affect propagation characteristics of substrate integrated waveguide. These phenomena are investigated by employing two simple examples of periodic structures.