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PIER PIER B PIER C PIER M PIER Letters
2010-02-16
Application of Stub Loaded Folded Stepped Impedance Resonators to Dual Band Filters
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. 102, 107-124, 2010
doi:10.2528/PIER10011406
Abstract
In this paper, a folded stepped impedance resonator (SIR), modified by adding an inner quasi-lumped SIR stub, is used as a basis block for a new implementation of dual-band bandpass filters. The main advantage of the proposed filter is to make it possible to independently control the electrical features of the first and second bands. The behavior of the first band basically depends on the geometry of the outer folded SIR. The second band, however, is strongly influenced by the presence of the inner stub. Additional design flexibility is achieved by allowing the inner stub to be located at an arbitrary position along the high impedance line section of the main SIR. The position of the tapped input and output lines can be optimized in order to reach a reasonable matching of the filter at the central frequencies of both passbands. Some designs are reported to illustrate the possibilities of the proposed structure. Experimental verification has been included.
Citation
Maria Velazquez-Ahumada, Jesus Martel-Villagran, Francisco Medina, and Francisco Mesa, "Application of Stub Loaded Folded Stepped Impedance Resonators to Dual Band Filters," Progress In Electromagnetics Research, Vol. 102, 107-124, 2010.
doi:10.2528/PIER10011406
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