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2014-01-12

Microstrip Bandpass Filters Based on Inductive-Coupled Stepped-Impedance Quarter-Wavelength Resonators

By Fei Cheng, Xianqi Lin, Yuan Jiang, Kaijun Song, and Yong Fan
Progress In Electromagnetics Research Letters, Vol. 44, 101-106, 2014
doi:10.2528/PIERL13110805

Abstract

Inductive-coupling scheme for microstrip bandpass filters with quarter-wavelength stepped-impedance resonators is proposed. This is realized by a short-end stub which behaves as a K-inverter. It is investigated that the coupling coefficient of the resonators can be easily controlled by the length of the short-end stub. The filter has a compact size and good stopband rejection by employing the quarter-wavelength stepped-impedance resonators. The design procedure of this kind of filter is provided. Two filters working at 2.4 GHz are designed and fabricated to demonstrate the proposed method.

Citation


Fei Cheng, Xianqi Lin, Yuan Jiang, Kaijun Song, and Yong Fan, "Microstrip Bandpass Filters Based on Inductive-Coupled Stepped-Impedance Quarter-Wavelength Resonators," Progress In Electromagnetics Research Letters, Vol. 44, 101-106, 2014.
doi:10.2528/PIERL13110805
http://jpier.org/PIERL/pier.php?paper=13110805

References


    1. Lee, J.-R., J.-H. Cho, and S.-W. Yun, "New compact bandpass filter using microstrip λ\4 resonators with open stub inverter," IEEE Microw. Wireless Compon. Lett., Vol. 10, No. 12, 526-527, 2000.

    2. Wang, C.-H., Y.-S. Lin, and C. H. Chen, "Novel inductance-incorporated microstrip coupled-line bandpass filters with two attenuation poles ," IEEE MTT-S Int. Microw. Symp. Dig., 1979-1982, 2004.

    3. Athukorala, L. and D. Budimir, "Design of open-loop dual-mode microstrip filters," Progress In Electromagnetics Research Letters, Vol. 19, 179-185, 2010.

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

    5. Kuo, Y.-T. and C.-Y. Chang, "Analytical design of two-mode dual-band filters using E-shaped resonators," IEEE Trans. on Microwave Theory and Tech., Vol. 60, No. 2, 250-260, 2012.
    doi:10.1109/TMTT.2011.2176506

    6. Makimoto, M. and S. Yamashita, Microwave Resonators and Filters for Wireless Communication: Theory, Design and Application, , Springer, Berlin, 1997.

    7. Liang, C. H. and C. Y. Chang, "Compact wideband bandpass filters using stepped-impedance resonators and interdigital coupling structures," IEEE Microw. Wireless Compon. Lett., Vol. 19, No. 9, 551-553, 2009.
    doi:10.1109/LMWC.2009.2027060

    8. Hong, J.-S. and M. J. Lancaster, "Microstrip Filters for RF/Microwave Applications," Wiley, 2001.

    9. Kuo, T.-N., S.-C. Lin, C.-H. Wang, and C.-H. Chen, "Compact bandpass filters based on microstrip and coplanar waveguide resonators ," 2006 Asia-Paci¯c Microwave conference Proceedings, 1431-1434, 2006.