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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2025-07-18
Compact Stepped-Impedance Low-Pass Filter Using Coplanar Open-Circuited Stubs
By
Yi-Ruo Chen,

    Dr. Yi-Ruo Chen

    National Taiwan University of Science and Technology

    Taiwan

    Homepage

Kuan-Wei Chen,

    Mr. Kuan-Wei Chen

    National Taiwan University of Science and Technology

    Taiwan

    Homepage

Chun-Long Wang

    Prof. Chun-Long Wang

    Department of Electronic and Computer Engineering

    National Taiwan University of Science and Technology

    Taiwan

    Homepage

Progress In Electromagnetics Research C, Vol. 157, 239-246, 2025
doi:10.2528/PIERC25041701 | Google Scholar

Abstract
This paper proposes a compact stepped-impedance low-pass filter using coplanar open-circuited stubs. The coplanar open-circuited stubs, which are used to compensate for the capacitive effect of the stepped-impedance low-pass filter, are implemented underneath the stepped-impedance low-pass filter. Consequently, the size of the stepped-impedance low-pass filter can be significantly reduced from 11.1 mm × 23.4 mm to 5.6 mm × 9.4 mm without altering its performance, amounting to a reduction rate of 79.83%. In addition, The transmission coefficient is attenuated below -30 dB, which is less than -20 dB attenuation of the conventional stepped-impedance low-pass filter. To verify the simulation result, the conventional stepped-impedance low-pass filter and the compact stepped-impedance low-pass filter using coplanar open-circuited stubs are fabricated and measured where the measurement results agree well with the simulation ones.
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Citation
Yi-Ruo Chen, Kuan-Wei Chen, and Chun-Long Wang, "Compact Stepped-Impedance Low-Pass Filter Using Coplanar Open-Circuited Stubs," Progress In Electromagnetics Research C, Vol. 157, 239-246, 2025.
doi:10.2528/PIERC25041701
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