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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2011-05-24
A High Selectivity Quadruple-Mode BPF with Two Short-Circuited Stub-Loaded SIRs
By
Liang Zhou,

    Dr. Liang Zhou

    Department of Electronic Engineering

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Shaobin Liu,

    Dr. Shaobin Liu

    Department of Electronic Engineering

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Ya-Nan Guo,

    Dr. Ya-Nan Guo

    Department of Electronic Engineering

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Xiang-Kun Kong,

    Dr. Xiang-Kun Kong

    College of Electronic and Information Engineering

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Hai Feng Zhang

    Prof. Hai Feng Zhang

    College of Electronic and Information Engineering

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 24, 43-50, 2011
doi:10.2528/PIERL11042001 | Google Scholar

Abstract
In this paper, a high selectivity quadruple-mode bandpass filter (BPF) with source-load coupling is proposed. This filter uses two short-circuited stubloaded stepped-impedance resonators (SIRs) which have the same type but different size. Two SIRs can generate four operating modes, which can be approximately adjusted individually. Owing to the special design of the filter, the coupling of two resonators is weak. In each resonator, the even-mode frequency can be flexibly controlled by changing the length of the short stub, whereas the odd-mode one remains stationary. Due to the source-load coupling, two transmission zeros are close to the cut-off frequencies of the passband, which leads to high selectivity. Simulated results show that central frequency is 2.27 GHz with 3-dB fractional bandwidth of 22.9%. The measured and simulated results are well complied with each other.
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Citation
Liang Zhou, Shaobin Liu, Ya-Nan Guo, Xiang-Kun Kong, and Hai Feng Zhang, "A High Selectivity Quadruple-Mode BPF with Two Short-Circuited Stub-Loaded SIRs ," Progress In Electromagnetics Research Letters, Vol. 24, 43-50, 2011.
doi:10.2528/PIERL11042001
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