Propagation characteristics of substrate integrated waveguide based on LTCC

The substrate integrated waveguide (SIW) is a new type of guided wave structure fabricated with periodic metallic via holes in a multilayered LTCC substrate. The SIW takes the advantages of both waveguide and microstrip structures, like the high-Q factor, high power capacity, small size, and the possibility of integration. In this paper, the propagation characteristics of the SIW are investigated, based on a finite difference method by using appropriate absorbing boundary conditions. A special treatment has been made in the interaction of the incident wave with the SIW structure. Simulated results are given to test the validity and efficiency of the proposed method, from which very interesting phenomena have been found in the SIW.