Design of SIW Bandpass Filter using DGS-DMS Technique for 5G Application
Keywords:
Bandpass filter, Substrate integrated waveguide (SIW), Defected ground structure (DGS), Defected microstrip structure (DMS), dumbbell DGS (DB-DGS)Abstract
A novel SIW bandpass filter based on the combination of DGS (Defected Ground Structure)
and DMS (Defected Microstrip structure) is proposed. Their excellent defected
characteristics are verified through the simulated results. The proposed filter is designed by
etching a dumbbell shaped DGS in the ground plane of the SIW cavity in order to improve
the stopband performance. Defected Microstrip structure (DMS) is made by etching a single
or double slots to create a finite passband, rejection band and slow wave characteristics. The
filter is fed using microstrip to SIW transition technique over a material with dielectric
constant of 3.5 and thickness of 0.5mm. Additionally to a sharp cutoff, the filter exhibits
simple design, low insertion loss of 0.5dB and it achieves rejection bandwidth with overall
28dB attenuation from 26GHz to 28GHz. Utilizing this concept, SIW BPF of 27.4GHz center
frequency with 7.2%fractional bandwidth at -3dB has been implemented for the application
of 5G spectrum bands. The structure has been simulated using Advanced Design Software
(ADS).
