volume | PIER Journals

Abstract

Compact dual-mode dual-band bandpass filters are realized with a single periodic stepped-impedance ring resonator. Neither extra resonator nor substrate layer is required for implementing the second passband. Based on the transmission line theory, a transmission zero design graph consisting of the transmission zeros together with the resonant frequencies of the resonator is developed against the space separation angle between the input and output ports. Based on this graph, when the line-to-ring feed structure is implemented, the space angle can be determined for the dual-mode dualband design with designated zeros near the two passbands. It is believed that this is the first design graph for designating the transmission poles and zeros of a dual-mode ring resonator filter before the excitation structure is realized. Three dual-mode dual-band bandpass filters are carried out for demonstration. All circuits occupy only 60% of the area of the conventional ring resonator bandpass filter at the first frequency. Measured results of experimental circuits show good agreement with simulated responses.

1. Chang, K. and L.-H. Hsieh, Microwave Ring Circuits and Related Structures, Wiley, New Jersey, NY, 2004.
doi:10.1002/0471721298

2. Mo, S.-G., Z.-Y. Yu, and L. Zhang, "Design of triple-mode bandpass filter using improved hexagonal loop resonator," Progress In Electromagnetics Research, Vol. 96, 117-125, 2009.
doi:10.2528/PIER09080304 Google Scholar

3. Zhu, L. and K. Wu, "A joint field/circuit model of line-to-ring coupling structures and its application to the design of microstrip dual-mode filters and ring resonator circuits," IEEE Trans. Microw. Theory Tech., Vol. 47, No. 10, 1938-1948, Oct. 1999. Google Scholar

4. Kundu, A. C. and I. Awai, "Control of attenuation pole frequency of a dual-mode microstrip ring resonator bandpass filter," IEEE Trans. Microw. Theory Tech., Vol. 49, No. 6, 1113-1117, Jun. 2001.
doi:10.1109/22.925499 Google Scholar

5. Matsuo, M., H. Yabuki, and M. Makimoto, "Dual-mode stepped-impedance ring resonator for bandpass filter applications," IEEE Trans. Microw. Theory Tech., Vol. 49, No. 7, 1235-1240, Jul. 2001.
doi:10.1109/22.932241 Google Scholar

6. Kuo, J.-T. and C.-Y. Tsai, "Periodic stepped-impedance ring resonator (PSIRR) bandpass filter with a miniaturized area and desirable upper stopband characteristics," IEEE Trans. Microw. Theory Tech., Vol. 54, No. 3, 1107-1112, Mar. 2006.
doi:10.1109/TMTT.2005.864121 Google Scholar

7. Chiou, Y.-C., J.-T. Kuo, and J.-S. Wu, "Miniaturized dual-mode ring resonator bandpass filter with microstrip-to-CPW broadside-coupled structure," IEEE Micow. Wirelss Compon. Lett., Vol. 18, No. 2, 97-99, Feb. 2008.
doi:10.1109/LMWC.2007.915036 Google Scholar

8. Behera, S. and K. J. Vinoy, "Microstrip square ring antenna for dualband operation," Progress In Electromagnetics Research, Vol. 93, 41-56, 2009.
doi:10.2528/PIER09021909 Google Scholar

9. Alkanhal, M. A. S., "Composite compact triple-band microstrip antennas," Progress In Electromagnetics Research, Vol. 93, 221-236, 2009.
doi:10.2528/PIER09050407 Google Scholar

10. Heidari, A. A., M. Heyrani, and M. Nakhkash, "A dual-band circularly polarized stub loaded microstrip patch antenna for GPS applications," Progress In Electromagnetics Research, Vol. 92, 195-208, 2009.
doi:10.2528/PIER09032401 Google Scholar

11. Castaldi, G., V. Fiumara, and I. Gallina, "An exact synthesis method for dual-band Chebyshev impedance transformers," Progress In Electromagnetics Research, Vol. 86, 305-319, 2008.
doi:10.2528/PIER08100605 Google Scholar

12. Wu, Y., Y. Liu, and S. Li, "A compact pi-structure dual band transformer," Progress In Electromagnetics Research, Vol. 88, 121-134, 2008.
doi:10.2528/PIER08102601 Google Scholar

13. Kuo, J.-T., T.-H. Yeh, and C.-C. Yeh, "Design of microstrip bandpass filters with a dual-passband response," IEEE Trans. Microw. Theory Tech., Vol. 53, No. 4, 1331-1337, Apr. 2005.
doi:10.1109/TMTT.2005.845765 Google Scholar

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

15. Wang, X.-H. and B.-Z. Wang, "Compact broadband dual-band bandpass fiers using slotted ground structures," Progress In Electromagnetics Research, Vol. 82, 151-166, 2008.
doi:10.2528/PIER08030101 Google Scholar

16. Chen, J.-X., T.-Y. Yum, J.-L. Li, and Q. Xue, "Dual-mode dual-band bandpass filter using stacked-loop structure," IEEE Microw. Wireless Compon. Lett., Vol. 16, No. 9, 502-504, Sep. 2006.
doi:10.1109/LMWC.2006.880705 Google Scholar

17. Zhang, X. Y. and Q. Xue, "Novel dual-mode dual-band filters using coplanar-waveguide-fed ring resonators," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 10, 2183-2190, Oct. 2007.
doi:10.1109/TMTT.2007.906501 Google Scholar

18. Yang, R.-Y., K. Hon, C.-Y. Hung, and C.-S. Ye, "Design of dual-band bandpass filters using a dual feeding structure and embedded uniform uniform impedance resoanators," Progress In Electromagnetics Research, Vol. 105, 93-102, 2010.
doi:10.2528/PIER10042504 Google Scholar

19. Huang, T.-H., H.-J. Chen, C.-S. Chang, L.-S. Chen, Y.-H. Wang, and M.-P. Houng, "A novel compact ring dual-mode filter with adjustable second-passband for dual-band applications," IEEE Microw. Wireless Compon. Lett., Vol. 16, No. 6, 360-362, Jun. 2006.
doi:10.1109/LMWC.2006.875607 Google Scholar

20. Chiou, Y.-C., C.-Y. Wu, and J.-T. Kuo, "New miniaturized dual-mode dual-band ring resonator bandpass filter with microwave C-sections," IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 2, 67-69, Feb. 2010.
doi:10.1109/LMWC.2009.2038432 Google Scholar

21. Luo, S. and L. Zhu, "A novel dual-mode dual-band bandpass filter based on a single ring resonator," IEEE Microw. Wireless Compon. Lett., Vol. 19, No. 8, 497-499, Aug. 2009.
doi:10.1109/LMWC.2009.2024826 Google Scholar

22. Luo, S., L. Zhu, and S. Sun, "A dual-band ring-resonator bandpass filter based on two pairs of degenerate modes," IEEE Trans. Microw. Theory Tech., Vol. 58, No. 8, Aug. 2010. Google Scholar

23. IE3D Simulator, Zeland Software Inc., Jan. 1997.

24. Chiou, Y.-C. and J.-T. Kuo, "Comment on `Compact UWB bandpass filter using stub-loaded multiple-mode resonator'," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 11, 811, Nov. 2007.
doi:10.1109/LMWC.2007.908062 Google Scholar

Dr. Yi-Chyun Chiou

Dr. Ping-Shiang Yang

Prof. Jen-Tsai Kuo

Mr. Cho-Yuh Wu