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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2008-10-29
Improved Compact Broadband Bandpass Filter Using Branch Stubs Co-via Structure with Wide Stopband Characteristic
By
Wen-Jeng Lin,

    Dr. Wen-Jeng Lin

    Institute of Microelectronics, Department of Electrical

    National Cheng-Kung University

    Taiwan

    Homepage

Chin-Sheng Chang,

    Dr. Chin-Sheng Chang

    Institute of Microelectronics, Advanced Optoelectronic Technology Center

    National Cheng-Kung University

    Taiwan

    Homepage

Jian-Yi Li,

    Dr. Jian-Yi Li

    Institute of Microelectronics, Department of Electrical Engineering

    National Cheng-Kung University

    Taiwan, R.O.C.

    Homepage

Ding-Bing Lin,

    Prof. Ding-Bing Lin

    Department of Electronic and Computer Engineering

    National Taiwan University of Science and Technology

    Taiwan

    Homepage

Lih-Shan Chen,

    Dr. Lih-Shan Chen

    Department of Electronic Engineering

    I-Shou University

    Taiwan

    Homepage

Mau-Phon Houng

    Dr. Mau-Phon Houng

    Institute of Microelectronics, Department of Electrical

    National Cheng-Kung University

    Taiwan

    Homepage

Progress In Electromagnetics Research C, Vol. 5, 45-55, 2008
doi:10.2528/PIERC08092602 | Google Scholar

Abstract
In this paper, a broadband bandpass filter (BPF) with superior spurious suppression over a wide frequency range at least up to 20 GHz at −20 dB has been designed. The proposed broadband bandpass filter has designed using quarter-wavelength short stubs alternating with branch stubs co-via structure, and inserting the bandstop filters to substitute for redundant connecting lines. Compare with some traditional co-via structure, this work by using the branch stubs to construct the co-via structure, not only reduce the size around 70% but also decrease the radiation loss due to some complex meander configurations occurring in the connecting lines. For the prototype broadband filter, center frequencies around 4 GHz were selected. The bandwidth of passband was between 1.95 GHz and 6.25 GHz, in which the insertion-loss amounts to around −1.5 dB. The suppression range of stopbandis between 8.2-20.3 GHz, in which the insertion-loss amounts to around −20 dB.
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Citation
Wen-Jeng Lin, Chin-Sheng Chang, Jian-Yi Li, Ding-Bing Lin, Lih-Shan Chen, and Mau-Phon Houng, "Improved Compact Broadband Bandpass Filter Using Branch Stubs Co-via Structure with Wide Stopband Characteristic," Progress In Electromagnetics Research C, Vol. 5, 45-55, 2008.
doi:10.2528/PIERC08092602
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