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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2017-11-21
Design of Dual-Band Bandstop Filter Based on Dumbbell-Shaped Resonators and U-Shaped Slot
By
Xue-Liang Min,

    Dr. Xue-Liang Min

    Missile Institute of Airforce Engineering University

    China

    Homepage

Hou Zhang

    Dr. Hou Zhang

    Electromagnetic and Microwave Technology

    Missile Institute of Air Force Engineering University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 71, 133-140, 2017
doi:10.2528/PIERL17091804 | Google Scholar

Abstract
A novel dual-band bandstop filter based on a square, symmetric dumbbell-shaped resonator and U-shaped slot defected ground structure is presented. First, the characteristic of the fundamental structure which adopts two dumbbell-shaped resonators and one U-shaped slot is analyzed. Simulated results demonstrate that the proposed structure induces two transmission zeros within 2-8 GHz. Then, the structure adopting four dumbbell-shaped resonators and one U-shaped slot is analyzed. Simulated results point out that the characteristic of dual stopbands is better than the fundamental structure. Based on above implementation, a dual-band bandstop filter based on eight proposed dumbbell-shaped resonators and two U-shaped slots is proposed and fabricated. Two center frequencies at 4 and 6.5 GHz are reported, corresponding to the attenuation levels of 41.9 and 26.1 dB. The return losses of center frequencies are 0.04 and 0.20 dB, respectively, and the dual stopband bandwidths with 10 dB signal attenuation are 690 MHz and 250 MHz. In addition, two transmission poles at each stopband are induced for better selectivity. Owing to the symmetric dumbbell shape, the size of the filter gets reduced. It is simple to design and quite compatible with planar construction fabrication.
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Citation
Xue-Liang Min, and Hou Zhang, "Design of Dual-Band Bandstop Filter Based on Dumbbell-Shaped Resonators and U-Shaped Slot," Progress In Electromagnetics Research Letters, Vol. 71, 133-140, 2017.
doi:10.2528/PIERL17091804
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