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2014-05-04
An Independently Tunable Dual-Band Filter Using Asymmetric λ/4 Resonator Pairs with Shared via-Hole Ground
By
Progress In Electromagnetics Research, Vol. 146, 99-108, 2014
Abstract
This paper presents a dual-band tunable bandpass filter with independently controllable dual passbands based on a novel asymmetric λ/4 resonator pair with shared via-hole ground. Because two separated passbands can be independently generated by the two λ/4 resonators with different electric lengths, the asymmetric λ/4 resonator pair can realize flexible passband allocation when it is utilized to design dual-band filters. Two varactors are placed at the two open circuit ends of the asymmetric λ/4 resonator pair to control the two dominant resonant frequencies, respectively. A prototype tunable dual-band filter with Chebyshev response is designed and fabricated. The measured results are in good agreement with the full-wave simulated ones. The results show that the first passband varies in a frequency range from 0.88 GHz to 1.12 GHz with the 3-dB fractional bandwidth of 5.1%-6.4%, while the second passband can be tuned from 1.5 GHz to 1.81 GHz with the 3-dB fractional bandwidth of 5.4%-6.4%.
Citation
Fei Liang, Xiaofei Zhai, Wenzhong Lu, Qianxing Wan, and Yanyu Zhang, "An Independently Tunable Dual-Band Filter Using Asymmetric λ/4 Resonator Pairs with Shared via-Hole Ground," Progress In Electromagnetics Research, Vol. 146, 99-108, 2014.
doi:10.2528/PIER14032505
References

1. Chen, J.-X., J. Shi, Z.-H. Bao, and Q. Xue, "Tunable and switchable bandpass filters using slot-line resonators," Progress In Electromagnetics Research, Vol. 111, 25-41, 2011.
doi:10.2528/PIER10100808

2. Li, Z., X.-H. Wang, Z.-D. Wang, and Y.-F. Bai, "Compact electronically tunable microstrip dual-band filter using stub-loaded SIRs," Journal of Electromagnetic Waves and Applications, Vol. 28, No. 1, 39-48, 2014.
doi:10.1080/09205071.2013.855148

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

4. Girbau, D., A. Lazaro, E. Martinez, D. Masone, and L. Pardell, "Tunable dual-band bandpass filter for WLAN applications," Microwave and Optical Technology Letters, Vol. 51, 2025-2028, 2009.
doi:10.1002/mop.24550

5. Djoumessi, E. E., M. Chaker, and K. Wu, "Varactor-tuned quarter-wavelength dual-bandpass filter," IET Microwaves, Antennas & Propagation, Vol. 3, No. 1, 117-124, 2009.
doi:10.1049/iet-map:20080040

6. Feng, T., Y. Li, H. Jiang, W. Li, F. Yang, X. Dong, and H. Chen, "Tunable single-negative metamaterials based on microstrip transmission line with varactor diodes loading," Progress In Electromagnetics Research, Vol. 120, 35-50, 2011.

7. Serrano, A. L. C., F. S. Correra, T.-P. Vuong, and P. Ferrari, "Synthesis methodology applied to a tunable patch filter with independent frequency and bandwidth control," IEEE Transactions on Microwave Theory and Techniques, Vol. 60, No. 3, 484-493, 2007.
doi:10.1109/TMTT.2011.2181533

8. Liu, B., F. Wei, and Q.-Y. Wu, "A tunable bandpass filter with constant absolute bandwidth," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 11-12, 1596-1604, 2011.
doi:10.1163/156939311797164819

9. Zhu, Y., R.-W. Mao, and S. T. Chen, "A varactor and FMR-tuned wideband band-pass filter module with versatile frequency tunability," IEEE Transactions on Magnetics, Vol. 47, No. 2, 284-288, 2011.
doi:10.1109/TMAG.2010.2070836

10. Wang, Y.-Y., F. Wei, H. Xu, and X. W. Shi, "A tunable 1.4-2.5 GHz bandpass filter based on single mode," Progress In Electromagnetics Research, Vol. 135, 261-269, 2013.
doi:10.2528/PIER12111704

11. Liu, B., F. Wei, H. Zhang, and X. Shi, "A tunable bandpass filter with switchable bandwidth," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 2-3, 223-232, 2011.
doi:10.1163/156939311794362704

12. Zhang, H.-L., X. Y. Zhang, and B.-J. Hu, "Tunable bandpass filters with constant absolute bandwidth," Antennas Propagation and EM Theory (ISAPE), 1200-1203, 2010.
doi:10.1109/ISAPE.2010.5696695

13. Wu, Z.-H., F. Wei, and Y.-Y. Wang, "A tunable dual-passband filter based on improved ring resonator," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 1, 141-149, 2010.
doi:10.2528/PIER10071802

14. Wang, X.-H., L. Zhang, Y.-F. Bai, Y. Xu, and H. Xu, "Compact tunable dual-band filter using SIRs without extra blocking capacitances," Journal of Electromagnetic Waves and Applications, Vol. 27, No. 5, 544-551, 2013.
doi:10.1080/09205071.2013.756381

15. Chaudhary, G., J. Yongchae, and L. Jongsik, "Harmonic suppressed dual-band bandpass filters with tunable passbands," IEEE Transactions on Microwave Theory and Techniques, Vol. 60, No. 7, 2115-2123, 2012.
doi:10.1109/TMTT.2012.2197020

16. Chaudhary, G., J. Yongchae, and L. Jongsik, "Dual-band bandpass filter with independently tunable center frequencies and bandwidths," IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 1, 107-116, 2013.
doi:10.1109/TMTT.2012.2222910

17. Huang, X.-G., L. Zhu, and Q.-Y. Feng, "Tunable bandpass filter with independently controllable dual passbands," IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 9, 3200-3208, 2013.
doi:10.1109/TMTT.2013.2273894

18. Liang, F., B. Luo, W.-Z. Lu, and X.-C. Wang, "A compact dual-band filter with close passbands using asymmetric λ/4 resonator pairs with shared via-hole ground," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 8-9, 1289-1296, 2011.
doi:10.1163/156939311795761971