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Novel crest‐trough shaped spoof surface plasmon polaritons for low pass filtering applications
Author(s) -
Anwar Rana Sadaf,
Mao Lingfeng,
Ning Huansheng
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32210
Subject(s) - surface plasmon polariton , optics , groove (engineering) , passband , microwave , physics , planar , plasmon , microstrip , reflection coefficient , transmission coefficient , stopband , surface plasmon , materials science , band pass filter , optoelectronics , transmission (telecommunications) , telecommunications , engineering , computer science , quantum mechanics , metallurgy , computer graphics (images)
In this letter, a novel periodic crest‐trough (CT) shaped groove structure is proposed to excite and propagate spoof surface plasmon polaritons (SSPPs) at microwave frequency. Such a groove shape solves the problem of high transmission losses found in traditional microstrip transmission lines and presents tighter field confinement. Lower dispersion band is achieved by proposed CT‐SSPPs as compared to traditional structures, with 28% reduced asymptotic frequency than rectangular groove. Influence of some geometrical parameters is also explored. Further, planar low‐pass plasmonic filters with low reflection and high efficiency are investigated with compact transition circuitry for smooth and fast conversion between SSPPs and guided waves. To validate the proposed performance, two plasmonic filter structures are fabricated and measured. Full agreement is observed between the simulated and measured results for which reflection coefficient is lower than −10 dB in passband up to 3.07 and 2.52 GHz, respectively for both filters. The rejection level is higher than −15 dB in the whole stopband.