Parametric studies on effects of defected ground structure (DGS) for 6 GHz bandpass filter

Parallel coupled bandpass filter is proposed and designed by placing defected ground structure (DGS) in the ground plane. The proposed open loop dumbbell shaped DGS is used to tuned the bandpass filter to 6 GHz with a dimension of 50mm × 25mm. The bandpass filter is designed by using FR-4 printed circuit board and a tuning range of 0.994 GHz is achieved. This filter gives an insertion loss of -5.784 dB and a return loss of -11.051 dB. A comparison of the design of bandpass filter with open loop dumbbell shaped DGS is analyzed to identify the better performance of the bandpass filter. The results of simulated and measured filter is analyzed and discussed.

[1]  Chirag Garg,et al.  A Review of Defected Ground Structure (DGS) in Microwave Design , 2014 .

[2]  Michael J. Lancaster,et al.  Design of Filtering Microstrip Antenna Using Filter Synthesis Approach , 2014 .

[3]  Mudrik Alaydrus,et al.  Designing Microstrip Bandpass Filter at 3.2 GHz , 2010 .

[4]  M. A. Othman,et al.  X band parallel coupled- line with dumbbell dgs filter for radar applications , 2013, 2013 3rd International Conference on Instrumentation, Communications, Information Technology and Biomedical Engineering (ICICI-BME).

[7]  Wang Xiaojun,et al.  Design of two-band band-pass filter using defected ground structure (DGS) resonators , 2012, Proceedings of 2012 5th Global Symposium on Millimeter-Waves.

[8]  M. A. Zakariya,et al.  Tuning of end-coupled line bandpass filter for 2.4 GHz using defected ground structure (DGS) parameters , 2013, 2013 IEEE Business Engineering and Industrial Applications Colloquium (BEIAC).

[9]  Shilpi Gupta,et al.  Design & Optimization of Microstrip Parallel Coupled Bandpass Filter at 20 GHz , 2014 .

[10]  A. Omar,et al.  An improvement of defected ground structure lowpass/bandpass filters using H-slot resonators and coupling matrix method , 2011 .

[11]  Lingqin Meng,et al.  A novel dual-mode dual-band bandpass filter with DGS structure , 2015, 2015 Asia-Pacific Microwave Conference (APMC).

[12]  Ashish Duvey,et al.  Design a Micro-Strip Band Pass Filter for 6 GHz , 2012 .

[13]  D. Jackson,et al.  Gap Discontinuity in Microstrip Lines: An Accurate Semianalytical Formulation , 2011, IEEE Transactions on Microwave Theory and Techniques.