Analysis and design of compact digital phase shifter using substrate integrated waveguide

Most of the researches are attracted by Substrate Integrated Waveguide (SIW) based devices due to small size, less cost, less weight, and low loss. The technology of Substrate Integrated Waveguide takes the advantages of both waveguides and planar transmission lines. The Substrate Integrated Waveguides fabrication in planar form is done using standard PCB. This paper includes analysis of SIWs using commercially available low cost FR4 material with thickness h=0.8mm. They were designed to operate at different cut off frequencies (8GHz, 16GHz, and 32GHz). The simulation results show that there is a good agreement between the response of SIW and conventional metallic waveguides. This paper also gives the analysis of phase shifter using SIW to operate at 10GHz. It is demonstrated that phase of the signal can be varied by inserting post inside the SIW and parametric studies proves that phase can be changed over a larger range by varying positions of the post.