Coplanar Waveguide UWB Bandpass Filter Using Defected Ground Structure and Interdigital Capacitor

  • Pratibha Verma
  • Tamasi Moyra
  • Dwipjoy Sarkar
  • Priyansha Bhowmik
  • Sarbani Sen
  • Dharmvir Kumar
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 714)


In this present work, a coplanar waveguide (CPW) ultra-wideband (UWB) bandpass filter (BPF) is proposed using defected ground structure (DGS) and interdigital capacitor having the exact passband frequency range of (3.1–10.6) GHz, minimum passband insertion loss of 0.14 dB and stopband rejection level below 20 dB from 11.8 to 16 GHz. Lumped equivalent circuit model of CPW UWB BPF is also extracted. Mathematical modelling to calculate values of generated inductances, capacitances and resistance of proposed BPF is indicated. Circuit size is miniaturized to an area of 7 mm × 9.3 mm and BPF is simulated on Fr4 substrate with dielectric constant of 4.4 and thickness of 1.6 mm. The proposed BPF is applicable for Bluetooth and wireless devices.


CPW UWB BPF DGS Interdigital capacitor Stopband rejection Insertion loss Lumped equivalent circuit 


  1. 1.
    J.-S. Hong, Microstrip Filters for RF/Microwave Applications, 2nd Edition, Wiley, 2011.Google Scholar
  2. 2.
    C. P. Wen, “Coplanar waveguide: a surface strip transmission line suitable for nonreciprocal gyromagnetic device applications,” IEEE Trans. Microwave Theory Tech., Vol. MTT-17, No. 12, pp. 1087–1090, Dec. 1969.Google Scholar
  3. 3.
    Gao, Jing, et al. “Short-circuited CPW multiple-mode resonator for ultra-wideband (UWB) bandpass filter.” IEEE Microwave and Wireless Components Letters 16.3 (2006): 104–106.Google Scholar
  4. 4.
    Yao, Chunhui, et al. “A New Type of Miniature Ultra-Wideband Band-Pass Filter with Coplanar Waveguide Fed.” International Journal of Infrared and Millimeter Waves 28.10 (2007): 859–863.Google Scholar
  5. 5.
    Sekar, Vikram, and Kamran Entesari. “Miniaturized UWB bandpass filters with notch using slow-wave CPW multiple-mode resonators.” IEEE Microwave and Wireless Components Letters 21.2 (2011): 80–82.Google Scholar
  6. 6.
    Fang, Jinyong, et al. “Compact printed ultra-wide band filter employing SRR-DGS.” Ubiquitous Wireless Broadband (ICUWB), 2016 IEEE International Conference on. IEEE, 2016.Google Scholar
  7. 7.
    Kumar, Mukesh, and Suresh Kumar. “Different Methods of Designing Ultra Wideband Filters in Various Applications-A Review.” International Journal of Wired and Wireless Communications Vol. 3, Issue 1, October, 2014.Google Scholar
  8. 8.
    Oh, Sangyeol, et al. “UWB bandpass filter with dual notched bands based on microstrip to CPW transition.” Wireless and Microwave Technology Conference (WAMICON), 2015 IEEE 16th Annual. IEEE, 2015.Google Scholar
  9. 9.
    Aryanfar, Farshid, and Kamal Sarabandi. “Characterization of semilumped CPW elements for millimeter-wave filter design.” IEEE transactions on microwave theory and techniques 53.4 (2005): 1288–1293.Google Scholar
  10. 10.
    Xu, Mingming, et al. “Design of a novel V-band coplanar waveguide low-pass filter based on defected ground structures.” Microwave Technology & Computational Electromagnetics (ICMTCE), 2011 IEEE International Conference on. IEEE, 2011.Google Scholar
  11. 11.
    Ehab K. L. Hamad, Amr M. E. Safwat, and Abbas S. Omar, “L-Shaped Defected Ground Structure for Coplanar Waveguide”, IEEE Antennas and Propagation Society International Symposium, 0-7803-8883-6/05/$20.00 ©2005 IEEE, vol. 2B, pp. 663–666, 2005.Google Scholar
  12. 12.
    Hu jiang and Liu gang, “Triangle-shaped defected ground structure for coplanar waveguide”, IEEE 2008.Google Scholar
  13. 13.
    L. H. Weng, Y. C. Guo, X. W. Shi, and X. Q. Chen, “An overview on Defected Ground Structure”, Progress in Electromagnetics Research B, Vol. 7, pp. 173–189, 2008.Google Scholar
  14. 14.
    M. F. Karim, A. Q. Liu, A. Alphones, X. J. Zhang and A. B. Yu, “CPW bandstop filter using unloaded and loaded EBG structure”, IEE Proceeding - Microwaves, Antennas and Propagation, IET Journals & Magazines, Vol. 152, pp. 434–440, 2005.Google Scholar
  15. 15.
    Ajayan, K. R., and K. J. Vinoy. “Planar Inter Digital Capacitors on Printed Circuit Board.” IEEE Trans. Microw. Theory Tech 41.9 (1993): 191–194.Google Scholar
  16. 16.
    Peddireddy, Prathibha, and Chhavi Kush. “Micromachined wide bandpass filter.” Communications and Signal Processing (ICCSP), 2015 International Conference on. IEEE, 2015.Google Scholar
  17. 17.
    Khandelwal, Mukesh Kumar, Binod Kumar Kanaujia, and Sachin Kumar. “Defected Ground Structure: Fundamentals, Analysis, and Applications in Modern Wireless Trends.” International Journal of Antennas and Propagation 2017 (2017).Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Pratibha Verma
    • 1
  • Tamasi Moyra
    • 1
  • Dwipjoy Sarkar
    • 1
  • Priyansha Bhowmik
    • 1
  • Sarbani Sen
    • 1
  • Dharmvir Kumar
    • 1
  1. 1.Department of Electronics and Communication EngineeringNIT AgartalaJiraniaIndia

Personalised recommendations