Calculation of the Complex Propagation Constant of Substrate Integrated Waveguide

In this paper, an analytical method for calculating the complex propagation constant of substrate integrated waveguide (SIW) is proposed, which is based on the scattering theory of the infinite grating of conducting circular cylinders. Making use of this method, the dominant mode propagation characteristic of SIW is calculated and used for the design of SIW. The calculated results are compared with published results and the agreement verified the accuracy of this method.