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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2026-08-18
A Stable Multi-Band Bandpass Negative Group Delay Circuit with Ultra-Low Insertion Loss
By
Zhiyang Feng,

    Mr. Zhiyang Feng

    School of Information Science and Engineering

    Dalian Polytechnic University

    China

    Homepage

Aixia Yuan,

    Dr. Aixia Yuan

    School of Information Science and Engineering

    Dalian Polytechnic University

    China

    Homepage

Junzheng Liu,

    Dr. Junzheng Liu

    Dalian SeaSky Automation Co.

    China

    Homepage

Yuwei Meng,

    Dr. Yuwei Meng

    School of Information Science and Engineering

    Dalian Polytechnic University

    China

    Homepage

Hongjun Zhang

    Dr. Hongjun Zhang

    School of Information Science and Engineering

    Dalian Polytechnic University

    China

    Homepage

Progress In Electromagnetics Research C, Vol. 172, 371-378, 2026
doi:10.2528/PIERC26062305 | Google Scholar

Abstract
Negative group delay (NGD) circuits are important for signal delay compensation in RF and microwave systems. However, realizing multiple NGD passbands with low insertion loss and compact size remains challenging. This paper proposes a compact lumped-element tri-band bandpass NGD circuit for low-frequency RF applications. The proposed circuit consists of three parallel resonant branches. Theoretical modeling, parameter analysis, circuit simulation, and experimental measurements are carried out to investigate the NGD characteristics. The fabricated prototype exhibits NGD responses at 46 MHz, 90 MHz, and 146 MHz. The measured group delays are -3.35 ns, -2.13 ns, and -1.41 ns, respectively, while the corresponding insertion losses are 1.807 dB, 1.638 dB, and 1.495 dB. The fractional NGD bandwidths reach 36.96%, 18.88%, and 12.90%. The proposed lumped-element topology provides compact size, low insertion loss, and tri-band NGD performance, making it suitable for low-frequency RF delay compensation and multi-band signal-processing applications.
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Citation
Zhiyang Feng, Aixia Yuan, Junzheng Liu, Yuwei Meng, and Hongjun Zhang, "A Stable Multi-Band Bandpass Negative Group Delay Circuit with Ultra-Low Insertion Loss," Progress In Electromagnetics Research C, Vol. 172, 371-378, 2026.
doi:10.2528/PIERC26062305
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