Analysis and Design of Substrate Integrated Waveguide Bandpass Filter with DGS for Ku-Band Applications

The technology of Substrate Integrated Waveguide (SIW) and Defected Ground Structure (DGS) are combined and a novel compact bandpass filter is proposed in this paper. The SIW cavity connected in between two tapered microstrip lines used to provide passband characteristic and it has the advantage of high quality factor, low insertion loss. The proposed filter is designed by square slots connected with narrow slot at the edge is etched on the bottom ground plane in order to provide stopband performance of the filter. Moreover a flexible bandwidth and center frequency can be achieved by proper adjusting the dimensions of the SIW and DGS of the filter. The simulated results used to verify the defected characteristic of the filter. The simulated insertion loss and return loss of the filter operated at center frequency of 13.85GHz are 0.002dB and better than 26dB respectively, which makes it suitable for Ku-band applications. The proposed filter structure has been simulated using Advanced Design Software (ADS)