Wideband Bandpass Filters Based on Multipole Resonances of Spoof Localized Surface Plasmons
Xuanru Zhang, Di Bao, Jun Feng Liu, Tie Jun Cui
TL;DR
This paper introduces wideband bandpass filters utilizing multipole resonances of spoof localized surface plasmons, demonstrating their tunability, compactness, and effective filtering characteristics for advanced RF applications.
Contribution
It presents a novel filter design based on SLSP multipole resonances with strong coupling techniques, achieving wide, flat passbands in compact structures.
Findings
Wide passbands achieved with compact size
Effective spurious rejection and group delay performance
Geometric tunability of the filters
Abstract
We propose wideband bandpass filters based on multipole resonances of spoof localized surface plasmons (SLSPs). The resonance characteristics and geometric tunability of SLSPs are investigated under microstrip excitations. Strong coupling with interlayer microstrip lines is proposed to join discrete multipole resonances into a continuous and flat passband. The SLSP filters exhibit wide passbands in compact sizes and well-balanced shapes, while holding satisfactory spurious rejection bands, group delays, and geometric tunability. This work exposes the SLSPs' application potential in filters as novel resonators.
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