ArticleScientific reports2025
Miniaturized broadband lowpass filter based on the integrated square dumbbell and meander structure spoof surface plasmon polaritons.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
A novel miniaturized broadband low-pass filter (LPF) is proposed based on the integrated square dumbbell and meander (SDBM) structure spoof surface plasmon polaritons (SSPPs). Compared with the conventional H-shaped and square dumbbell structure SSPP unit-cells, the integrated SDBM structure can effectively reduce its asymptotic frequency, revealing much better slow-wave characteristics. A broadband LPF is designed by integrating two types of SDBM structure SSPP unit-cell to enhance out-of-band suppression. Finite element method (FEM) simulations demonstrate that the SDBM structure SSPPs-based LPF exhibits excellent lowpass characteristics across a broadband range of 0-2.24 GHz, achieving a remarkably high out-of-band rejection level of - 27 dB in a broadband range of 2.39-8.7 GHz. An equivalent LC circuit model is established for the proposed SDBM-structured SSPPs-based LPF, exhibiting a reasonable consistency with the FEM results. The designed LPF is skillfully realized utilizing conventional PCB manufacturing techniques, achieving with a size of only 0.238λ
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