Comparison of conventional and substrate integrated waveguide filters for satellite communication

This paper deals with the design and comparison between 5th order waveguide (WG) and substrate integrated waveguide (SIW) filters for satcom applications, e.g. very small aperture terminals (VSAT). The filters are designed for the passband from 13.75 GHz to 14.5 GHz and realized using non-symmetrical inductive irises. Rogers RO4003c substrate was used for the SIW structure. An insertion loss (IL) of less than 0.8 dB within the desired bandwidth is achieved for the WG filter and 3.3 dB in case of the SIW filter.