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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2014-09-07
Dual-Band Bandpass Filter with Independently Tunable Passbands and Wide Stopband
By
Ying Fang Guo,

    Dr. Ying Fang Guo

    National Laboratory of Science and Technology on Antennas and Microwaves

    Xidian University

    P.R. China

    Homepage

Feng Wei,

    Prof. Feng Wei

    Xidian University

    China

    Homepage

Ming Zhong Lin,

    Dr. Ming Zhong Lin

    National Key Laboratory of Science and Technology on Antennas and Microwaves

    Xidian University

    China

    Homepage

Xiao-Wei Shi

    Professor Xiao-Wei Shi

    School of Electronics Engineering

    Xidian University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 49, 1-8, 2014
doi:10.2528/PIERL14062603 | Google Scholar

Abstract
This paper presents a dual-mode stub loaded ring resonator (SLRR) to design a tunable dual-band bandpass filter (BPF) with two independently controllable passbands. The proposed resonator principally comprises a stepped-impedance ring resonator (SIRR) loaded with three stubs and two varactor diodes. Two independently tunable passbands are implemented by employing two varactors to control the dominant even-mode resonant frequency and odd-mode resonant frequency, respectively. Moreover, a new stub loaded double-ring resonator (SLDRR) is proposed to design the second tunable dual-band filter by shorting two stubs of the SLRR. With the same tuning method, the second filter can achieve two independently controllable passbands. In order to suppress the harmonics, defected ground structures (DGSs) are introduced at input and output feeding lines without degrading the passbands characteristics. The simulated and measured results are found in good agreement with each other.
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Citation
Ying Fang Guo, Feng Wei, Ming Zhong Lin, and Xiao-Wei Shi, "Dual-Band Bandpass Filter with Independently Tunable Passbands and Wide Stopband," Progress In Electromagnetics Research Letters, Vol. 49, 1-8, 2014.
doi:10.2528/PIERL14062603
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