volume | PIER Journals

Abstract

In this paper, new microstrip bandstop filters with single band, dual-band and tri-band by using U-shaped defected ground structures are presented without the assistance of coupled lines or certain resonators, and the application of DGS is developed. The proposed bandstop filters have good performances of low loss, multi-band operation, transmission zeros which improve the filter frequency selectivity, and miniaturization because of the cascade of DGS and minimum defected patterns which reduce the circuit size. The new designs are demonstrated by measurement.

1. Wu, , G.-L., W. Mu, X.-W. Dai, and Y.-C. Jiao, , "Design of novel dual-band bandpass ¯lter with microstrip meander-loop resonator and CSRR DGS," Progress In Electromagnetics Research,, Vol. 78, 17-24, 2008.
doi:10.2528/PIER07090301

2. Wang, , L., B.-R. Guan, and , "Compact dual-mode DGS resonators and filters," Progress In Electromagnetics Research Letters,, Vol. 25, 47-55, 2011..

3. Chotjit, , S., S. Chaimool, and P. Akkaraeakthalin, "A miniaturized dual-mode bandpass fiter using triangular loop resonator with wide stopband by U-Shaped defected ground structure (DGS)," Asia-Pacific Microwave Conference (APMC),, 1-4, 2007.
doi:10.1109/APMC.2007.4554816

4. Che, , W. Q., W. J. Feng, and K. Deng, , "Microstrip dual-band bandstop ¯lter of defected ground structure and stepped impedance resonators," International Journal of Electronics, Vol. 97, No. 11, 1351-1359, 2010. .
doi:10.1080/00207217.2010.488907

5. Chen, , J., Z.-B.Weng, Y.-C. Jiao, and F.-S. Zhang, "Lowpass filter design of hilbert curve ring defected ground structure," Progress In Electromagnetics Research, Vol. 70, , 269-280, , 2007..
doi:10.2528/PIER07012603

6. Chen, , X.-Q., R. Li, S.-J. Shi, et al., "A novel low pass filter using elliptic shape defected ground sstructure," Progress In Electromagnetics Research B, , Vol. 9, 117-126, 2008.
doi:10.2528/PIERB08071801

7. Verma, , A. K., A. Kumar, and , "Design of low-pass filters using some defected ground structures," AEU-International Journal of Electronics and Communications,, Vol. 65, No. 10, 864-872, 2011.
doi:10.1016/j.aeue.2011.02.007

8. Al Sharkawy, , M. H., D. Abd El Aziz, and E. Galal, "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.

9. Mohra, , A. S., , "Microstrip low pass filter with wideband rejection using opened circuit stubs and Z-slots defected ground structures," Microwave and Optical Technology Letters, Vol. 53, No. 4, 811-815, 2011.
doi:10.1002/mop.25876

10. Xiao, , J.-K., Y.-F. Zhu, and S. F. Jeffrey , "DGS lowpass filters extend wide stopbands," Microwaves & RF,, Vol. 50, No. 3, , 66-76, 2011.

11. Rehman, , S. U., A. F. Sheta, and M. Alkanhal, , "Compact band-stop ¯lter using defected ground structure (DGS)," Saudi International Electronics, Communications and Photonics Conference, 2011.

12. Yang, , M. H., J. Xu, Y. L. Dong, et al., "A novel open-loop DGS for compact bandstop filter with improved Q factor," The 8th International Symposium on Antennas, Propagation and EM Theory Proceedings, , 649-652, 2008.
doi:10.1109/ISAPE.2008.4735297

13. Park, , J. I., C. S. Kim, J. S. Park, et al., "Modeling of photonic bandgap and its application for the low-pass filter design," Asia-Pacific Microwave Conference Proceedings,, 331-334, , 1999.

14. Woo, , D.-J., T.-K. Lee, J.-W. Lee, et al., "Novel U-Slot and V-Slot DGSs for bandstop filter with improved Q factor," IEEE Trans. on Microwave Theory and Techniques, , Vol. 54, No. 6, 2840{-2847, 2006.
doi:10.1109/TMTT.2006.875450

15. Chin, , K.-S., J.-H. Yeh, and S.-H. Chao, , "Compact dual-band bandstop ¯lters using stepped-impedance resonators," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 12, 849-851, 2007.
doi:10.1109/LMWC.2007.910481

Prof. Jian-Kang Xiao

Dr. Yu-Feng Zhu