PIER Letters
 
Progress In Electromagnetics Research Letters
ISSN: 1937-6480
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 19 > pp. 163-169

HIGH SELECTIVITY BROADBAND BANDPASS FILTER WITH DUAL-MODE FOLDED-T-TYPE RESONATOR

By H.-W. Deng, Y.-J. Zhao, X.-S. Zhang, W. Chen, and W. Liu

Full Article PDF (219 KB)

Abstract:
In this letter, a compact and high selectivity broadband bandpass filter (BPF) is proposed using the dual-mode folded-T-type resonator and the short stub loaded parallel-coupling feed structure. The resonator can generate one even-mode and one odd-mode in the desired band. Two resonant frequencies can be adjusted easily to satisfy the bandwidth of the BPF. A parallel-coupling feed structure with a cross coupling has been applied to generate two transmission zeros in the lower and upper stopband. Furthermore, the loaded short stub can create two transmission zeros near the upper cut-off frequency and in the upper stopband. Simultaneity, the transmission zero in the lower stopband moves towards the cut-off frequency. One filter prototype with the fractional bandwidth 57% is fabricated for experimental verification of the predicted results. The size for the resonator is only 0.156λg×0.303λg in which λg is the guided wavelength of 50 Ω microstrip at the center frequency.

Citation:
H.-W. Deng, Y.-J. Zhao, X.-S. Zhang, W. Chen, and W. Liu, "High Selectivity Broadband Bandpass Filter with Dual-Mode Folded-T-Type Resonator," Progress In Electromagnetics Research Letters, Vol. 19, 163-169, 2010.
doi:10.2528/PIERL10111701

References:
1. Lin, W.-J., C.-S. Chang, J.-Y. Li, D.-B. Lin, L.-S. Chen, and M.-P. Houng, "Improved compact broadband bandpass filter using branch stubs co-via structure with wide stopband characteristic," Progress In Electromagnetics Research C, Vol. 5, 45-55, 2008.
doi:10.2528/PIERL08103103

2. Zhang, L., Z.-Y. Yu, and S.-G. Mo, "Novel planar multimode bandpass filters with radial-line stubs," Progress In Electromag netics Research, Vol. 101, 33-42, 2010.
doi:10.2528/PIER09121303

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

4. Kong, Y. W., X. D. Huang, C. H. Cheng, and S. T. Chew, "EBG-based dual mode resonator filter," IEEE Microwave and Wireless Components Lett., Vol. 14, No. 3, 124-126, 2004.
doi:10.1109/LMWC.2003.822570

5. Tan, B. T., J. J. Yu, S. T. Chew, M.-S. Leong, and B.-L. Ooi, "A miniaturized dual-mode ring bandpass filter with a new perturbation," IEEE Microwave and Wireless Components Lett., Vol. 53, No. 1, 343-345, 2005.

6. Huang, X. D. and C. H. Cheng, "A novel coplanar-waveguide bandpass filter using a dual-mode square-ring resonator," IEEE Microwave and Wireless Components Lett., Vol. 16, No. 1, 13-15, 2006.
doi:10.1109/LMWC.2005.861358

7. Kang, W., W. Hong, and J. Y. Zhou, "Performance improvement and size reduction of microstrip dual-mode bandpass filter," Electronics Letter, Vol. 44, No. 6, 421-422, 2008.
doi:10.1049/el:20080285

8. Hong, J.-S., H. Shaman, and Y.-H. Chun, "Dual-mode microstrip open-loop resonators and filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 8, 1764-1770, 2007.
doi:10.1109/TMTT.2007.901592

9. Deng, H.-W., Y.-J. Zhao, X.-S. Zhang, L. Zhang, and S.-P. Gao, "Compact wide upper-stopband BPF using open stub loaded dual-mode resonator," Microwave and Optical Technology Letters, Vol. 52, No. 10, 2185-2188, 2010.
doi:10.1002/mop.25453

10. Deng, H.-W., Y.-J. Zhao, X.-S. Zhang, L. Zhang, and W. Zhao, "Compact dual-mode open stub-loaded resonator and BPF," Progress In Electromagnetics Research Letters, Vol. 14, 119-125, 2010.
doi:10.2528/PIERL10032904

11. Athukorala, L. and D. Budimir, "Compact dual-mode open loop microstrip resonators and filters," IEEE Microwave and Wireless Components Lett., Vol. 19, No. 11, 698-700, 2009.
doi:10.1109/LMWC.2009.2032003

12. Ma, K., K. C. B. Liang, R. M. Jayasuriya, and K. S. Yeo, "A wideband and high rejection multimode bandpass filter using stub Perturbation," IEEE Microwave and Wireless Components Lett., Vol. 19, No. 1, 24-26, Jan. 2009.
doi:10.1109/LMWC.2008.2008554

13. Shen, W., X.-W. Sun, and W.-Y. Yin, "A novel microstrip filter using three-mode stepped impedance resonator (TSIR)," IEEE Microwave and Wireless Components Lett., Vol. 19, No. 12, 774-776, Dec. 2009.
doi:10.1109/LMWC.2009.2033495

14. Li, L. and Z.-F. Li, "Side-coupled shorted microstrip line for compact quasi-elliptic wideband bandpass filter design," IEEE Microwave and Wireless Components Lett., Vol. 20, No. 6, 124-126, 2010.


© Copyright 2010 EMW Publishing. All Rights Reserved