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PIER PIER B PIER C PIER M PIER Letters
2009-12-16
Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method
By
Chang-Sin Ye,

    Dr. Chang-Sin Ye

    Department of Electrical Engineering

    Institute of Microelectronics Institute of Microelectronics

    Taiwan

    Homepage

Yan-Kuin Su,

    Prof. Yan-Kuin Su

    Institute of Microelectronics & Department of Electrical Engineering

    National Cheng Kung University

    Taiwan, China

    Homepage

Min-Hang Weng,

    Dr. Min-Hang Weng

    Medical devices and opto-electronics equipment department

    Metal Industries Research & Development Center

    Taiwan

    Homepage

Cheng-Yuan Hung,

    Dr. Cheng-Yuan Hung

    Department of Electronics Engineering and Computer Sciences

    Tung-Fang Design University

    Taiwan

    Homepage

Ru-Yuan Yang

    Professor Ru-Yuan Yang

    Department of Material Engineering

    National Ping-Tung University of Science and Technology

    Taiwan

    Homepage

Progress In Electromagnetics Research, Vol. 100, 153-173, 2010
doi:10.2528/PIER09073002
Abstract
In this paper, the design of compact and high performance parallel coupled line wideband bandpass filter using image parameter method are proposed. The filter mainly comprising one-stage parallel coupled line and two open stubs are designed and implemented on commercial RT/Duroid 5880 substrate. The equivalent circuit of the proposed structure is initially derived by using the image parameter method. It is found that, the normalized bandwidth (NBW) of image impedance for the one-stage parallel coupled line has a relation to the electromagnetic (EM) simulated bandwidth. To further improve the selectivity, two open stubs are connected near the input/output (I/O) ports. The design procedures and their limitations are discussed in detail. The proposed filters are fabricated, measured and showing good characteristics of 87% fractional bandwidth as well as good insertion/return loss, flat group delay varies between 0.3-1.5 ns. High passband selectivity and wide stopband from 8-14 GHz are obseved. The measured results are also having a good agreement with the simulated results.
Citation
Chang-Sin Ye, Yan-Kuin Su, Min-Hang Weng, Cheng-Yuan Hung, and Ru-Yuan Yang, "Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method," Progress In Electromagnetics Research, Vol. 100, 153-173, 2010.
doi:10.2528/PIER09073002
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