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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2010-09-16
Compact Wideband Bandpass Filter with Quadruple-Mode Stub-Loaded Resonator
By
Hong-Wei Deng,

    Dr. Hong-Wei Deng

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Yong-Jiu Zhao,

    Dr. Yong-Jiu Zhao

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Lu Zhang,

    Dr. Lu Zhang

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Xue-Shun Zhang,

    Dr. Xue-Shun Zhang

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Wei Zhao

    Dr. Wei Zhao

    Xidian University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 17, 125-132, 2010
doi:10.2528/PIERL10081108 | Google Scholar

Abstract
In this paper, a novel compact wideband bandpass filter (BPF) is proposed using quadruple-mode resonator formed by attaching a short-circuited stub at the center plane and two identical impedance-stepped open stubs to high impedance microstrip line. The resonator can generate two even-modes fm1, fm3 and two odd-modes fm2, fm4 in the desired band. The even-mode resonant frequencies can be flexibly controlled by the short-circuited stub, whereas the odd-mode ones are fixed. When the open stubs are attached to the center plane nearby, they can be mainly applied to adjust fm3, fm4 into desired passband as the high odd-mode and even-mode resonant frequencies are vulnerable to their electronic lengths. Two transmission zeros near the lower and upper cut-off frequencies are separately created by the short-circuited stub and interdigital feeding lines, leading to a high rejection skirt. A wideband BPF with the fractional bandwidth 64% is simulated, fabricated and measured. The measured results agree well with the EM simulations.
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Citation
Hong-Wei Deng, Yong-Jiu Zhao, Lu Zhang, Xue-Shun Zhang, and Wei Zhao, "Compact Wideband Bandpass Filter with Quadruple-Mode Stub-Loaded Resonator," Progress In Electromagnetics Research Letters, Vol. 17, 125-132, 2010.
doi:10.2528/PIERL10081108
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