volume | PIER Journals

Abstract

In this paper, a novel G-shaped defected microstrip structure (DMS) is presented. Compared with the conventional DMS, the proposed G-shaped DMS exhibits lower resonant frequency and wider stopband. A lowpass filter with 3 dB cutoff frequency at 3.17 GHz using four pairs of parallel cascaded G-shaped DMS units is designed and fabricated. The measured results show that the transition band is only 0.09 GHz and the stopband over 25 dB attenuation covers 3.4 GHz to 10 GHz.The measured and simulated results are in good agreement.

1. Lu, K., G.-M. Wang, Y.-W. Wang, and X. Yin, "An improved design of hi-lo microstrip lowpass filter using uniplanar double spiral resonant cells," Progress In Electromagnetics Research Letters, Vol. 23, 89-98, 2011. Google Scholar

2. Wu, Y., Y. Liu, S. Li, and C. Yu, "A new wide-stopband low-pass filter with generalized coupled-line circuit and analytical theory," Progress In Electromagnetics Research, Vol. 116, 553-567, 2011. Google Scholar

3. Yang, M. H., J. Xu, Q. Zhao, L. Peng, and G. P. Li, "Compact, broad-stopband lowpass filters using SIRs-loaded circular hairpin resonators," Progress In Electromagnetics Research, Vol. 102, 95-106, 2010.
doi:10.2528/PIER09120901 Google Scholar

4. Mohra, A. S., "Compact lowpass filter with sharp transition band based on defected ground structures," Progress In Electromagnetics Research Letters, Vol. 8, 83-92, 2009.
doi:10.2528/PIERL09041406 Google Scholar

5. Xi, D., Y.-Z. Yin, L.-H. Wen, Y. Mo, and Y. Wang, "A compact lowpass filter with sharp cutoff and low insertion loss characteristic using novel defected ground structures," Progress In Electromagnetics Research Letters, Vol. 17, 133-143, 2010.
doi:10.2528/PIERL10062501 Google Scholar

6. Al Sharkawy, M. H., D. Abd El-Aziz, and E. G. Mahmoud, "A miniaturized lowpass/bandpass filter using double arrow head defected ground structure with centered etched ellipse ," Progress In Electromagnetics Research Letters, Vol. 24, 99-107, 2011. Google Scholar

7. Wei, F., L. Chen, Q.-Y. Wu, X.-W. Shi, and C.-J. Gao, "Compact UWB bandpass filter with narrow notch-band and wide stop-band," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 7, 911-920, 2010.
doi:10.1163/156939310791285155 Google Scholar

8. Fallahzadeh, S. and M. Tayarani, "A new microstrip UWB bandpass filter using defected microstrip structures," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 7, 893-902, 2010.
doi:10.1163/156939310791285254 Google Scholar

9. Shen, W., W.-Y. Yin, and X.-W. Sun, "Compact microstrip tri-section bandpass filters with mixed couplings," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 13, 1807-1816, 2010. Google Scholar

10. NaghshvarianJahromi, M., "Novel compact meta-material tunable quasi elliptic band-pass filter using microstrip to slotline transition," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 17-18, 2371-2382, 2010.
doi:10.1163/156939310793675808 Google Scholar

11. Tirado-Mendez, J. A., H. Jardón-Aguilar, F. Iturbide-Sánchez, I. Garcia-Ruiz, V. Molina-Lopez, and R. Acevo-Herrera, "A proposed defected microstrip structure (DMS) behavior for reducing rectangular patch antenna size," Microw. Opt. Technol. Lett., Vol. 43, 481-484, Oct. 2004. Google Scholar

12. Zhang, S., J.-K. Xiao, and Y. Li, "Novel microstrip band-stop ¯lters based on complementary split ring resonators," Microw. J., Vol. 49, 100-112. Google Scholar

13. Naser-Moghadasi, M., M. Alamolhoda, and B. Rahmati, "Harmonics blocking in hairpin filter using defected microstrip structure," IEICE Electronics Express, Vol. 8, 629-635, May 2011.
doi:10.1587/elex.8.629 Google Scholar

14. Liu, H. W., Z. C. Zhang, S. Wang, L. Zhu, X. H. Guan, J. S. Lim, and D. Ahn, "Compact dual-band bandpass filter using defected microstrip structure for GPS and WLAN applications," Electronic Letter, Vol. 46, No. 21, 1444-1445, Oct. 2011.
doi:10.1049/el.2010.2146 Google Scholar

15. La, D. S., Y. H. Lu, S. Y. Sun, N. Liu, and J. L. Zhang, "A novel compact bandstop filter using defected microstrip structure," Microw. Opt. Technol. Lett., Vol. 53, 433-435, Feb. 2011.
doi:10.1002/mop.25708 Google Scholar

16. Xie, H. H., Y. C. Jiao, B.Wang, and F. S. Zhang, "DMS structures stop bandpass filter harmonics," Microwave & RF, Vol. 50, 72-76, Sept. 2011. Google Scholar

17. Xiao, J. K., W. J. Zhu, and J. S. Fu, "New bandstop filter using simple defected microstrip structure," Microw. J., Vol. 54, 134-144, Sept. 2011. Google Scholar

18. Xiao, J.-K. and W.-J. Zhu, "New defected microstrip structure bandstop filter," PIERS Proceedings, 1471-1474, Suzhou, China, Sept. 12-16, 2011. Google Scholar

19. Li, X. and H. Wang, "Analysis and application of shunt open stubs based on asymmetric half-wavelength resonators structure," Progress In Electromagnetics Research, Vol. 125, 311-325, 2012.
doi:10.2528/PIER12010302 Google Scholar

Dr. Hailin Cao

Dr. Wei Guan

Dr. Sijia He

Dr. Lisheng Yang