中文

Journal of Shanghai University（Natural Science Edition） ›› 2012, Vol. 18 ›› Issue (5): 459-463.doi: 10.3969/j.issn.1007-2861.2012.05.004

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Dual-Band Bandpass Filter Using Stub-Loaded Multiple Stepped-Impedance Resonators

HUANG Chun-yan,XIAO Zhong-yin,KOU Xin,CHU Jun-jun,LI Hao   

  1. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China
  • Received:2011-11-09 Online:2012-10-30 Published:2012-10-30

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Abstract: A novel dual-band filter using stub-loaded multiple stepped-impedance resonators is proposed. This filter can control each center frequency independently. In order to get more degrees of freedom, the microstrip filter uses a multiple stepped-impedance structure. Due to symmetry of the structure, the traditional even-odd mode analysis can be used. A dual-band filter can easily be obtained by adjusting the impedance ratio and electrical length. The dual-band filter with 3 dB relative bandwidths of 6% and 2.6% can be applied to 2.44 GHz (WLAN) and 3.50 GHz (WiMAX), respectively. Simulation results agree well with measurements.

Key words: bandpass filter (BPF), dual-band, even-odd mode, stepped stub-loaded

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