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1 results

  • New compact quad-passband bandpass filter based on multi-layer substrate technique

  • Hung-Wei Wu, Shih-Hua Huang
  • Journal:
    International Journal of Microwave and Wireless Technologies / Volume 7 / Issue 6 / December 2015
    Published online by Cambridge University Press:
    14 July 2014, pp. 679-683

  • A new compact quad-passband bandpass filter (BPF) using multi-mode resonators (MMRs) based on multi-layered substrate technique is proposed. The filter consists of a pair of multi-mode resonators (uniform impedance resonator and stepped impedance resonator) operated at 1.8/3.7 GHz on top layer and the other pair of the multi-mode resonators operated at 2.4/3 GHz on bottom layer. Source–load coupling lines are used to be the input/output (I/O) ports for providing the multi-paths propagations by cross-coupling effects in the filter. Specifically, the operated frequencies of the filter at 1.8/2.4/3/3.7 GHz with bandwidths of 6.7, 8.2, 4.6, and 7.2% are successfully designed and implemented. The proposed filter is useful for the multi-passband filters design, especially when the passbands are needed to be very close.