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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2023-08-19
A Novel Miniaturized Image Rejection Bandpass Filter Basing on Stepped-Impedance Resonators
By
Guangxiu Zhao,

    Dr. Guangxiu Zhao

    Anhui University

    China

    Homepage

Chen Li,

    Ms. Chen Li

    Anhui University

    China

    Homepage

Minquan Li,

    Professor Minquan Li

    School of Electronics and Information Engineering

    Anhui University

    China

    Homepage

Pingjuan Zhang,

    Dr. Pingjuan Zhang

    Anhui University

    China

    Homepage

Yajing Yan,

    Dr. Yajing Yan

    Anhui University

    China

    Homepage

Xiaming Mo,

    Dr. Xiaming Mo

    School of Electronic and Information Engineering

    Anhui University

    China

    Homepage

Ziyun Tu

    Dr. Ziyun Tu

    Anhui University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 112, 27-34, 2023
doi:10.2528/PIERL23063006 | Google Scholar

Abstract
In order to meet the requirements for the suppression of mirror frequencies in the 5G RF front end, this paper proposes a novel miniaturized image rejection bandpass filter by loading Stepped-Impedance Resonators (SIR). By analyzing the relationship between the impedance ratio of a half-wavelength SIR and its electrical length, we have designed an improved second-order bandpass filter, which reduces the size by 34.3% compared to traditional five-order hairpin filters. In order to further enhance the performance of the filter, the use of a radial stub, as opposed to the traditional rectangular open stub, allows for the generation of a wider band transmission zero, which can be analyzed using lumped equivalent circuits. This integration improves the stopband rejection of the filter. The results show that the passband range is 5.35 GHz-6.64 GHz; the rejection in the stopband range 8.10 GHz-11.98 GHz is over 45 dB; and the size is only 0.385λg×0.295λg.
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Citation
Guangxiu Zhao, Chen Li, Minquan Li, Pingjuan Zhang, Yajing Yan, Xiaming Mo, and Ziyun Tu, "A Novel Miniaturized Image Rejection Bandpass Filter Basing on Stepped-Impedance Resonators," Progress In Electromagnetics Research Letters, Vol. 112, 27-34, 2023.
doi:10.2528/PIERL23063006
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