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

Abstract

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).