volume | PIER Journals

Abstract

A high-performance microstrip low-pass filter (LPF) with low cutoff frequency, negligible passband insertion loss, very sharp transition band, and deep ultra-wide stopband is designed, fabricated and measured. The presented filter is realized using three types of resonators which are coupled C-shape defected ground structure (C-CDGS), mirrored series-resonant branch loaded by radial stub, and high impedance line loaded by radial stub. A novel equivalent circuit model of the C-CDGS resonator is created, and its corresponding parameters are also extracted. The proposed filter is experimentally verified through the measured results which show good agreement with electromagnetic simulations.

1. Maas, S. A., Microwave Mixers, 2nd Ed., Artech House, 1993.

2. Velidi, V. K. and S. Sanyal, "Sharp roll-off lowpass filter with wide stopband using stub-loaded coupled-line hairpin unit," IEEE Microwave and Wireless Components Letters, Vol. 21, No. 6, 301-303, May 2011.
doi:10.1109/LMWC.2011.2132120 Google Scholar

3. Makki, S. V., et al. "Sharp response microstrip LPF using folded stepped impedance open stubs," Radioengineering, Vol. 22, No. 1, 328-332, April 2013. Google Scholar

4. Mousavi, S. M. H., et al. "Design of high performance LPF with excellent return loss using stepped impedance and radial resonators," International Journal of Engineering & Technology Sciences (IJETS), Vol. 03, No. 1, 32-44, January 2015. Google Scholar

5. Hayati, M. and A. Sheikhi, "Microstrip lowpass filter with very sharp transition band and wide stopband," ETRI Journal, Vol. 33, No. 6, 981-984, December 2011.
doi:10.4218/etrij.11.0210.0493 Google Scholar

6. Weng, L. H., Y.-C. Guo, X.-W. Shi, and X.-Q. Chen, "An overview on defected ground structure," Progress In Electromagnetics Research B, Vol. 7, 173-189, 2008.
doi:10.2528/PIERB08031401 Google Scholar

7. Banerji, A., "Design of a wide stopband harmonic suppressed microstrip low pass planar filter using defected ground structure," International Journal on Electrical Engineering and Informatics, Vol. 4, No. 1, 134-147, March 2012.
doi:10.15676/ijeei.2012.4.1.11 Google Scholar

8. Kushwah, M. and D. Thakur, "Design of compact lowpass filter with wide stopband using I-shape," International Journal of Engineering Sciences & Research Technology, Vol. 3, No. 3, 1603-1605, March 2014. Google Scholar

9. Wu, J.-Y., Y.-H. Tseng, and W.-H. Tu, "Design of compact lowpass filter with ultra-wide stopband using thin slots," Progress In Electromagnetics Research C, Vol. 31, 137-151, 2012.
doi:10.2528/PIERC12052603 Google Scholar

10. Zhang, H., Z. Xu, Y. Lin, and R. Wu, "A novel DP-EBG structure for low-pass filter of wide stopband," PIERS Proceedings, 1477-1480, Guangzhou, China, August 25-28, 2014. Google Scholar

11. Shaheen, M., et al. "Compact LPF design with low cutoff frequency using V-shaped DGS structure," International Journal of Electronics and Communication Engineering & Technology (IJECET), Vol. 6, No. 1, 1-7, January 2015. Google Scholar

12. Wang, C.-J. and T. H. Lin, "A multi-band meandered slotted-ground plane resonator and its application of lowpass filter," Progress In Electromagnetics Research, Vol. 120, 249-262, 2011.
doi:10.2528/PIER11072203 Google Scholar

13. Challal, M., A. Boutejdar, et al. "Compact microstrip low-pass filter design with ultra-wide reject band using a novel quarter-circle DGS shape," ACES Journal, Vol. 27, No. 10, 808-815, October 2012. Google Scholar

14. Li, Y., H.-C. Yang, and S.-Q. Xiao, "Lowpass filter with wide stopband and sharp skirt using novel defected ground structure," Progress In Electromagnetics Research Letters, Vol. 41, 185-191, 2013.
doi:10.2528/PIERL13061501 Google Scholar

15. Jung, S., Y.-K. Lim, and H.-Y. Lee, "A coupled-defected ground structure lowpass filter using inductive coupling for improved attenuation," Microw. and Opt. Technol. Lett., Vol. 50, No. 6, 1541-1543, June 2008.
doi:10.1002/mop.23419 Google Scholar

16. Hong, J.-S. and M. J. Lancaster, "Couplings of microstrip square open-loop resonators for cross-coupled planar microwave filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 44, No. 12, December 1996. Google Scholar

17. Belbachir Kchairi, A., et al. "A novel compact lowpass filter using open-rectangle DGS technology for microwave mixers," International Journal of Microwave and Optical Technology, Vol. 10, No. 6, November 2015. Google Scholar

18. Hong, J.-S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, John Wiley & Sons, 2001.
doi:10.1002/0471221619

Dr. Abdelmounaim Belbachir Kchairi

Dr. Mohamed Boussouis

Dr. Naima Amar Touhami