Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Compact UWB Bandpass Filter as Cascaded Center-Tapped CRLH Transmission-Line ZORs for Improved Stopband

  • Lee, Boram (Dept. of Information and Telecommunication Engineering, University of Incheon) ;
  • Kahng, Sungtek (Dept. of Information and Telecommunication Engineering, University of Incheon) ;
  • Wu, Qun (Dept. of Electrical Engineering, Harbin Institute of Technology)
  • Received : 2012.05.30
  • Accepted : 2012.10.19
  • Published : 2013.03.01
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Abstract

The design of a new compact UWB bandpass filter is proposed, which has cascaded center-tapped microstrip composite right/left-handed transmission-line zeroth-order resonators (CRLH-TL ZORs). In an attempt to reduce the size, instead of the conventional half-wavelength resonators or periodic and multiple CRLH-TL cells, only one cell ZOR geometry is adopted as each resonator in the filter. Additionally, two center-tapped ZORs are coupled to increase the slope of the skirt. Besides, stepped impedance matching parts are placed in the paths to the input and output ports to enhance passband and stopband performances. The proposed filter is shown to have the overall size of $0.69{\lambda}_g{\times}0.70{\lambda}_g$, the insertion loss much less than 1 dB, and an acceptable return loss performance in the predicted and measured results.

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References

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