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PIER PIER B PIER C PIER M PIER Letters
2010-06-03
Design of Band-Pass Filters Using Stepped Impedance Resonators with Floating Conductors
By
Maria Velazquez-Ahumada,

    Dr. Maria Velazquez-Ahumada

    Dept. of Electronics and Electromagnetism

    University of Seville

    Spain

    Homepage

Jesus Martel-Villagran,

    Professor Jesus Martel-Villagran

    Department of Applied Physics 2

    University of Seville

    Spain

    Homepage

Francisco Medina,

    Prof. Francisco Medina

    Department of Electronics and Electromagnetics, College of Physics

    University of Seville

    Spain

    Homepage

Francisco Mesa

    Prof. Francisco Mesa

    Department of Applied Physics 1

    University of Seville

    Spain

    Homepage

Progress In Electromagnetics Research, Vol. 105, 31-48, 2010
doi:10.2528/PIER10042010
Abstract
A new type of miniaturized stepped impedance resonator (SIR) for bandpass filter applications is proposed in this paper. The new resonator incorporates a ground plane window with a floating conductor in the backside of the substrate. The ground plane window increase the characteristic impedance of the lines used to implement the inductive region of the quasi-lumped resonator, thus allowing some size reduction. Moreover, the presence of a floating conducting patch printed below the capacitive region of the resonator pushes up the first spurious band of the filter. A meaningful improvement of its out-of-band rejection level is then achieved. The coupling between adjacent resonators is also enhanced thus leading to wider achievable bandwidths. Some filter designs using the new resonator and other standard resonators are included for comparison purposes.
Citation
Maria Velazquez-Ahumada, Jesus Martel-Villagran, Francisco Medina, and Francisco Mesa, "Design of Band-Pass Filters Using Stepped Impedance Resonators with Floating Conductors," Progress In Electromagnetics Research, Vol. 105, 31-48, 2010.
doi:10.2528/PIER10042010
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