PIER C
 
Progress In Electromagnetics Research C
ISSN: 1937-8718
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 29 > pp. 249-260

NOVEL CLASS OF MICROSTRIP BANDPASS FILTERS WITH IMPROVED UPPER REJECTION BAND

By Y. L. Lu and G.-L. Dai

Full Article PDF (635 KB)

Abstract:
In this paper, we present a novel class of microstrip bandpass filters with improved upper rejection band. The proposed filters are composed of two half-wavelength resonators and two shortended microstrip feed lines for input and output. Using voltagewave analysis, we examine the resonance and coupling properties at harmonic frequencies. It is found that different combinations of the feed line and the resonator with proper selection of the coupling regions can suppress spurious responses. Benefiting from this approach, two single-band and one dual-band bandpass filters are designed, fabricated and measured. Simulated and measured results indicate that the upper rejection bands of the proposed filters are increased up to near thirdand fifth-order harmonics, respectively. And the rejection level during the stop-bands is kept below 20 dB.

Citation:
Y. L. Lu and G.-L. Dai, "Novel Class of Microstrip Bandpass Filters with Improved Upper Rejection Band," Progress In Electromagnetics Research C, Vol. 29, 249-260, 2012.
doi:10.2528/PIERC12031411

References:
1. Gao, , M.-J., , L.-S. Wu, and J.-F. Mao, "Compact notched ultra-Compact notched ultra-wideband bandpass ¯lter with improved out-of-band performance using quasi electromagnetic bandgap structure," Progress In Electromagnetics Research, Vol. 125, 137-150, 2012.
doi:10.2528/PIER12011701

2. Chaudhary, , G., , Y. Jeong, K. Kim, and D. Ahn, "Design of dual-band bandpass fiter with controllable bandwidths using new mapping function," Progress In Electromagnetics Research,, Vol. 124, 17-34, , 2012.
doi:10.2528/PIER11111407

3. Kuo, , J.-T. , S.-W. Lai, and , "New dual-band bandpass filter with wide upper new rejection band," Progress In Electromagnetics Research, , Vol. 123, 371-384, 2012.
doi:10.2528/PIER11112304

4. Lopetegi, T., , M. A. G. Laso, J. Hernandez, M. Bacaicoa D. Benito, M. J. Garde, M. Sorolla, and M. Guglielmi, "New microstrip `wiggly-line' filters with spurious passband suppression," IEEE Microw. Theory and Tech., Vol. 49, No. 9, 1593-1598, , 2001.
doi:10.1109/22.942571

5. Kuo, , J. T., , W. H. Hsu, and W. T. Huang, "Parallel coupled microstrip ¯lters with suppression of harmonic response," IEEE Microw. Wireless Compon. Lett., Vol. 12, No. 10, 383-385, 2002.
doi:10.1109/LMWC.2002.804559

6. Kim, B. S., B. S., J. W. Lee, and M. S. Song, , "An implementation microstrip ¯lters with suppression of harmonic response," IEEE Microw. Wireless Compon. Lett., Vol. 12, No. 10, 383-385, 2002.
doi:10.1109/LMWC.2002.804559

7. Kim, I. K., , N. Kingsley, M. Morton, R. Bairavasubramanian, J. Papapolymerou, M. M. Tentzeris, and J. G. Yook, "Fractal-shaped microstrip coupled-line bandpass filters for suppression of second harmonic," IEEE Microw. Theory and Tech., Vol. 53, No. 9, 2948,-2948, 2005..

8. Wang, Y. X., , Y. X., , B.-Z. Wang, and J. P. Wang, "A compact square loop dual-mode bandpass fiter with wide stop-band," Progress In Electromagnetics Research, Vol. 77, 67-73, 2007.
doi:10.2528/PIER07072707

9. Ye, , C.-S., , Y.-K. Su, M.-H. Weng, C.-Y. Hung, and R.-Y. Yang, "Design of the compact parallel-coupled lines wideband," Progress In Electromagnetics Research,, Vol. 100, 153-173, 2010.
doi:10.2528/PIER09073002

10. Kuo, , J.-T., , C.-Y. Fan, and S.-C. Tang, , "Dual-wideband bandpass ¯lters with extended stopband based on coupled-line and coupled three-line resonators," Progress In Electromagnetics Research, Vol. 124, 1-15, 2012.
doi:10.2528/PIER11120103

11. Kuo, , J.-T. , E. Shih, and , "Microstrip stepped impedance resonator bandpass ¯lter with an extended optimal rejection bandwidth," IEEE Microw. Theory and Tech., Vol. 51, No. 5, 1554-1559, 2003.
doi:10.1109/TMTT.2003.810138

12. U-yen, K., , E. J. Wollack, T. A. Doiron, J. Papapolymerou, and J. Laskar, "A planar bandpass filter design with wide stopband using double split-end stepped-impedance resonators," IEEE Microw. Theory and Tech., Vol. 54, No. 3, 1244,-1244, 2006.

13. Zhang, , J., and Compact and, "Compact and harmonic suppression open-loop resonator bandpass with trisection SIR," Progress In Electromagnetics Research,, Vol. 69, 93-100, 2007.
doi:10.2528/PIER06120702

14. Wu, Y.-L., , C. Liao, and X.-Z. Xiong, , "A dual-wideband bandpass filter based on E-shaped microstrip SIR with improved upper-stopband performance," Progress In Electromagnetics Research, Vol. 108, 141-153, 2010.
doi:10.2528/PIER10071802

15. Kuo, J.-T., , S.-C. Tang, and S.-H. Lin, "Quasi-electric function bandpass filter with upper stopband extension and high rejection level using cross-coupled stepped-impedance resonators," Progress In Electromagnetics Research, Vol. 114, 395-405, 2011.

16. Chen, C. F., T. Y. Huang, and R. B. Wu, "Design of microstrip bandpass filters with multiorder spurious-mode suppression," IEEE Microw. Theory and Tech., Vol. 53, No. 12, 3788-3793, 2005.
doi:10.1109/TMTT.2005.859869

17. Dai, , G. L., , X. Y. Zhang, C. H. Chan, Q. Xue, and M. Y. Xia, "An investigation of open- and short-ended resonators and their applications to bandpass filters," IEEE Microw. Theory and Tech.,, Vol. 57, No. 9, 2203-2210, 2209.

18. Li, , Y. C., X. Y. Zhang, and Q. Xue, , "Bandpass filter using discriminating coupling for extended out-of-band suppression," IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 7, 369-371, 2010.
doi:10.1109/LMWC.2010.2049425

19. Zhang, , X. Y., Q. Xue, and , "Harmonic-suppressed bandpass fiter based on discriminating coupling," IEEE Microw. Wireless Compon. Lett., Vol. 19, No. 11, 695-697, 2009..
doi:10.1109/LMWC.2009.2032002

20. Hong, J.-S. , J.-S. , M. J. Lancaster, and , Microstrip Filters for RF/Microwave Applications,, Wiley, , New York, 2001.
doi:10.1002/0471221619

21. Chen, C. Y. , C.-Y. Hsu, and , "A simple and effective method for microstrip dual-band filters design," IEEE Microw. Wireless Compon. Lett., Vol. 16, No. 5, 246-248, 2006.
doi:10.1109/LMWC.2006.873584

22. Zhang, , X. Y. , Q. Xue, and , "Novel centrally loaded resonators and their applications to bandpass filters," IEEE Microw. Theory and Tech., Vol. 56, No. 4, 913-921, 2008..
doi:10.1109/TMTT.2008.919648


© Copyright 2010 EMW Publishing. All Rights Reserved