• A.Banu priya
• Umma Habiba H

This research work proposes a novel bandpass filter using substrate integrated waveguide(SIW). Based on the concept of defected ground structure(DGS), a new class of SIW bandpass filter is designed in order to increase the out of band rejection. The proposed filter is designed by etching circular dumbbell shaped DGS in the ground plane of the SIW cavity and it is analyzed for different dimensions to obtain the desired filter response. The filter is fed using microstrip to SIW transition technique over a material with dielectric constant of 3.5 and thickness of 0.5mm. Utilizing this concept, SIW bandpass filter of center frequency 29.7GHZ with fractional bandwidth of 3.3%.The simulated results obtained with insertion loss of 1.7dB, return loss >20dB. The structure has been designed and simulated using Advanced Design Software(ADS).

Bandpass filter, Defected ground structure(DGS), Substrate integrated waveguide(SIW), Circular dumbbell DGS(DB-DGS), Fixed satellite services(FSS)

"Ka band compact and high performance SIW bandpass filter based on defected ground structure(DGS) ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.88-91, September-2018, Available :http://www.jetir.org/papers/JETIR1809419.pdf

"Ka band compact and high performance SIW bandpass filter based on defected ground structure(DGS) ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp88-91, September-2018, Available at : http://www.jetir.org/papers/JETIR1809419.pdf