Miniaturized broadband high out-of-band rejection bandpass filter based on spoof surface plasmon polaritons with defected ground structure

In this paper, a novel compact bandpass filter (BPF) with a wide out-of-band rejection is proposed. It can achieve broadband characteristics by combining hollow bowtie-type spoof surface plasmon polaritons (SSPPs) with complementary H-type defected grounded structures (DGSs) through aperture couplin...

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Vydané v:Scientific reports Ročník 14; číslo 1; s. 26722 - 9
Hlavní autori: Yang, Lingling, Liu, Haihong, Cai, Bin, Wu, Ling, Cheng, Yongzhi
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: London Nature Publishing Group UK 05.11.2024
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Bandpass filter (BPF)
Defected ground structure (DGS)
High rejection
Humanities and Social Sciences
Microwave communications
multidisciplinary
Science
Science (multidisciplinary)
Spoof surface plasmon polaritons (SSPPs)
Bandpass filter (BPF)
Defected ground structure (DGS)
Spoof surface plasmon polaritons (SSPPs)
High rejection
ISSN:2045-2322, 2045-2322
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Popis
Shrnutí:In this paper, a novel compact bandpass filter (BPF) with a wide out-of-band rejection is proposed. It can achieve broadband characteristics by combining hollow bowtie-type spoof surface plasmon polaritons (SSPPs) with complementary H-type defected grounded structures (DGSs) through aperture coupling. Compared with the conventional SSPP unit cells, the hollow bowtie-type structure exhibits much better slow-wave characteristics. The introduced slant antenna type port-coupling can produce a very strong high-performance rejection outside the high frequency stopband. Simulation results show that the SSPPs-DGS-based BPF has an excellent band pass characteristics in a broadband range with − 3dB fractional bandwidth of 43.5% at center frequency f 0 of 2.04 GHz. The return loss in the passband is better than − 12 dB. Furthermore, because of the multiple transmission zeros generated in upper-stop-band, the designed BPF has an extremely strong out-of-band rejection of -40dB from 1.5 f 0 to 4 f 0 ( f 0 is the center frequency). The designed SSPPs-DGS-based BPF is fabricated by conventional printed circuit board (PCB) technology with a compact size of only 0.68λ g *0.34λ g (λ g is the wavelength at the center frequency). The measured results have a good agreement with the simulation ones, which verifies the rationality and feasibility of the design. The miniaturized wideband BPF with broad out-of-band rejection may make it has good application prospect in the new generation microwave communication field.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-024-77705-y