YANG Jinping, WU Wen. Design of Quasi-Elliptic Low-Pass Filter with Single Attenuation Pole Using Defected Ground Structures[J]. Chinese Journal of Electronics, 2009, 18(3): 559-563.
Citation: YANG Jinping, WU Wen. Design of Quasi-Elliptic Low-Pass Filter with Single Attenuation Pole Using Defected Ground Structures[J]. Chinese Journal of Electronics, 2009, 18(3): 559-563.

Design of Quasi-Elliptic Low-Pass Filter with Single Attenuation Pole Using Defected Ground Structures

  • Received Date: 2007-02-01
  • Rev Recd Date: 2008-09-01
  • Publish Date: 2009-08-25
  • This paper presents a design of a microstrip quasi-elliptic Low-passfilter (LPF) with single attenuation pole at finite frequency usingDefected ground structures (DGSs). The designedLPF consists of two Dumb-bell-shaped Defected ground structures(DB-DGS) and a Spiral-shaped Defected ground structure (SP-DGS). Theprototype quasi-elliptic LPF is realized by introducing a capacitiveadmittance inverter into a Chebyshev LPF, and is optimized for the bestcompromise between the pass band insertion loss and the stop bandrejection based on circuit simulation approach. The DB-DGS is used toprovide the required inductance of the LPF, while the SP-DGS is used toprovide the required attenuation pole. Accurate curve-fitting and thesuccessive design approach are given to determine the required size ofDGSs corresponding to the prototype elements. Experimental results of afive-pole LPF for 2.4GHz show that the designed filter has a muchsharper cutoff frequency response than conventional one. A very widestop band from 3.65GHz to 12.7GHz with rejection better than -23dBis achieved. In addition, this filter is only 13.61mm long, which isless than one-sixth wavelength of the microstrip mode at the designfrequency.
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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