A Compact Quint-Band Bandpass Filter Based on Stub-Loaded Resonators
This paper presents a planar quant-band bandpass filter with a high out-of-band rejection. The filter is based on inter-coupled stub-loaded resonators, where pairs of resonators are electromagnetically coupled to each other and the feed lines. This results in excitation of passbands, where the first and the third passbands are generated by λ/4 stub-loaded resonators. The second and the fifth passbands are excited by λ/2 stub-loaded resonators. And the fourth passband is generated by λ/2 resonators. The proposed technique provides sufficient degree of freedom to control the center frequency and bandwidth of the five passbands. In addition, the seven transmission zeros created around the passbands results in a quant-band filter with high selectivity, sharp 3dB cut-off frequency, high isolation, and low passband insertion-loss. Design methodology and simulation results of the filter are provided.
J. C. Liu, J. W. Wang, B. H. Zeng, D. C. Chang, “CPW-fed dual mode double-square-ring resonators for quad-band filters”, IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 3, pp. 142–144, 2010 DOI: https://doi.org/10.1109/LMWC.2010.2040211
C. Cui, Y. Liu, “Quad-band bandpass filter design by embedding dual-band bandpass filter with dual-mode notch elements”, Electronics Letters, Vol. 50, No. 23, pp. 1719–1720, 2014 DOI: https://doi.org/10.1049/el.2014.2732
J. Xiao, Y. Zhu, Y. Li, X. Li, “Miniature quad-band bandpass filter with passband individually controllable using folded SIR”, Electronics Letters, Vol. 50, No. 9, pp. 679–680, 2014 DOI: https://doi.org/10.1049/el.2014.0605
H. Liu, B. Ren, X. Guan, P. Wen, Y. Wang, “Quad-Band High-Temperature Superconducting Bandpass Filter Using Quadruple-Mode Square Ring Loaded Resonator”, IEEE Trans. on Microwave Theory and Techniques, Vol. 62, No. 12, pp. 2931–2941, 2014 DOI: https://doi.org/10.1109/TMTT.2014.2366147
C. Chen, “Design of a compact microstrip quint-band filter based on the tri-mode stub-loaded stepped-impedance resonators”, IEEE Microw. Wireless Compon. Lett., Vol. 22, No. 7, pp. 357–359, 2012 DOI: https://doi.org/10.1109/LMWC.2012.2202894
K. Hsu, W. Hung, W. Tu, “Compact quint-band microstrip bandpass filter using double-layered substrate”, Proc. IEEE MTT-S, Int. Dig., Seattle, WA, USA, pp. 1–4, 2013 DOI: https://doi.org/10.1109/MWSYM.2013.6697353
J. Ai, Y. Zhang, K. D. Xu, D. Li, Y. Fan, “Miniaturized quint-band bandpass filter based on multi-mode resonator and λ/4 resonators with mixed electric and magnetic coupling”, Microw. Wirel. Compon. Lett., Vol. 26, No. 5, pp. 343–345, 2016 DOI: https://doi.org/10.1109/LMWC.2016.2549643
X. Y. Zhang, Q. Xue, “Dual-band bandpass filter using stub-loaded resonators,” IEEE Microw. Wireless. Compon. Lett., Vol. 17, No. 8, pp. 583–585, 2007 DOI: https://doi.org/10.1109/LMWC.2007.901768
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