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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2026-10-20
Multi-Band Negative Group Delay SSPP Circuits Using Backside H-Shaped Units
By
Qi Wang,

    Dr. Qi Wang

    Nanjing University of Information Science & Technology (NUIST)

    China

    Homepage

Fayu Wan,

    Professor Fayu Wan

    College of Electronics and Information Engineering

    Nanjing University of Information Science and Technology

    China

    Homepage

Nathan B. Gurgel,

    Mr. Nathan B. Gurgel

    Federal University of Campina Grande

    Brazil

    Homepage

Lagouge Tartibu,

    Dr. Lagouge Tartibu

    Department of Mechanical Engineering

    University of Johannesburg

    South Africa

    Homepage

Glauco Fontgalland,

    Dr. Glauco Fontgalland

    Brenton School of Engineering

    University of Mount Union

    USA

    Homepage

Sébastien Lallechere,

    Dr. Sébastien Lallechere

    Association Française de Science des Systèmes (AFSCET)

    France

    Homepage

Blaise Ravelo

    Dr. Blaise Ravelo

    Nanjing University of Information Science & Technology (NUIST)

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 140, 96-105, 2026
DOI:10.2528/PIERM26083104 | Google Scholar

Abstract
Spoof surface plasmon polariton (SSPP) circuits typically have a positive group delay (PGD), leading to undesired pulse broadening and limiting the performance of high-speed communication systems. To address this issue, a novel approach is introduced by integrating identical H-shaped units on the backside of a conventional coplanar waveguide (CPW) SSPP circuit. Negative group delay (NGD) is achieved through mutual coupling between these units, effectively compensating for PGD-induced distortions. Parametric scans revealed that increasing the number of NGD units enables multi-band NGD circuit operation, while incorporating multiple groups of isolated units further enhances NGD performance without significantly altering the center frequency. The experimental results demonstrate a dual-band NGD response with group delays (GD) GD(f1) = -2.33 ns and GD(f2) = -6.55 ns at f1 = 5.33 GHz and f2 = 8.07 GHz, respectively, and a four-band response with GDs GD(f1) = -1.66 ns, GD(f2) = -4.94 ns, GD(f3) = -4.64 ns, and GD(f4) = -1.46 ns at f1 = 3.24 GHz, f2 = 5.96 GHz, f3 = 7.64 GHz, and f4 = 8.39 GHz, respectively. These findings validate the effectiveness of the backside NGD structure in extending SSPP functionality, offering significant potential applications in microwave communication and sensing systems in which precise delay control and multi-band operation are critical.
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Citation
Qi Wang, Fayu Wan, Nathan B. Gurgel, Lagouge Tartibu, Glauco Fontgalland, Sébastien Lallechere, and Blaise Ravelo, "Multi-Band Negative Group Delay SSPP Circuits Using Backside H-Shaped Units," Progress In Electromagnetics Research M, Vol. 140, 96-105, 2026.
DOI:10.2528/PIERM26083104
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