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PIER PIER B PIER C PIER M PIER Letters
2012-02-04
A New Tri-Band Bandpass Filter for GSM, WiMAX and Ultra-Wideband Responses by Using Asymmetric Stepped Impedance Resonators
By
Wei-Yu Chen,

    Dr. Wei-Yu Chen

    Institute of Microelectronics and Department of Electrical Engineering

    National Cheng Kung University

    Taiwan

    Homepage

Min-Hang Weng,

    Dr. Min-Hang Weng

    Medical devices and opto-electronics equipment department

    Metal Industries Research & Development Center

    Taiwan

    Homepage

Shoou-Jinn Chang,

    Dr. Shoou-Jinn Chang

    Subwavelength Research Center and Department of Electrical Engineering

    National Cheng Kung University

    Taiwan, R.O.C.

    Homepage

Hon Kuan,

    Prof. Hon Kuan

    Department of Technology Electro-Optical Engineering

    Southern Taiwan University

    Taiwan

    Homepage

Yi-Hsin Su

    Dr. Yi-Hsin Su

    Department of Technology Electro-Optical Engineering

    Southern Taiwan University

    Taiwan

    Homepage

Progress In Electromagnetics Research, Vol. 124, 365-381, 2012
doi:10.2528/PIER11122010
Abstract
In this paper, a design of new tri-band bandpass filter for the application of GSM (1.8 GHz), WiMAX (2.7 GHz) and UWB (3.3-4.8 GHz) is proposed. The first two narrow passbands are created, and the bandwidth of the third passband can be tuned by properly selecting the impedance ratio (R) and physical length ratio (u) of the asymmetric stepped-impedance resonator. To improve passband performance and form the UWB passband, a U-shape defected ground structure and extra extended coupling lines are integrated with the asymmetric SIR. Due to the three transmission zeros appearing near the passband edges, the band selectivity of the proposed filter is much improved. The filter was fabricated, and the measured results have a good agreement with the full-wave simulated ones.
Citation
Wei-Yu Chen, Min-Hang Weng, Shoou-Jinn Chang, Hon Kuan, and Yi-Hsin Su, "A New Tri-Band Bandpass Filter for GSM, WiMAX and Ultra-Wideband Responses by Using Asymmetric Stepped Impedance Resonators," Progress In Electromagnetics Research, Vol. 124, 365-381, 2012.
doi:10.2528/PIER11122010
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