Miniaturized Bandpass Filter Based on High-Order Mode of Spoof Surface Plasmon Polaritons Loaded With Capacitor

Li, Yukun; Lin, Zhongchao; Zhao, Yutong; Xu, Junhua; Chen, Jianzhong

doi:10.1109/tps.2022.3232850

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…[20][21][22] reports SSPPs transmission lines with strong field confinement. [23][24][25] reports some filter with only one passband based on highorder mode. However, our designed filters are based on multiple high-order modes, which can achieve multiple transmission passbands with strong field enhancement effect.…”

Section: Performance Comparisonmentioning

confidence: 99%

Compact Muti-Frequency Band-Pass Filters Based on High-Order Mode of Folded Line Spoof Surface Plasmon Polaritons Waveguide

Yang,

Liu,

et al. 2024

IEEE Access

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We proposed a folded line spoof surface plasmonic polaritons (SSPPs) waveguide that allows for efficient and strongly constrained microwave SSPPs transmission. The dispersion characteristics of SSPPs waveguides based on folded line unit is investigated. Compared to conventional rectangular-grooved SSPPs waveguide with the same cut-off frequency, the lateral dimension of the folded line SSPPs waveguide can be reduced to 56%. The results show that the folded line SSPPs waveguide has stronger field binding as well as better miniaturization advantages. In order to validate the proposed design, a dual-band band-pass filter is designed based on the high-order mode of the proposed unit and we then add an asymmetric structure to achieve a tri-band band-pass filter with good performance. In addition, a band-pass filter with wide stopband between two pass bands is designed by incorporating an interdigital finger in the folded line unit, whose width of the stopband can be increased by 50% compared to the filter without interdigital finger. By optimizing the length of interdigital finger, two notch bands are respectively obtained in two pass bands of a dual-band passband filter. At the same time, the stopband is also widened. Four proposed filters are fabricated and the measurement results are in good agreement with the simulated ones, verifying the feasibility of the structure. The proposed SSPPs structure can significantly enhance the flexibility and universality of the filter. Additionally, these filters offer compact structures, wide stopbands, and hold immense potential for application in integrated devices.INDEX TERMS Band-pass filter, folded line, notch band, spoof surface plasmonic polaritons (SSPPs).

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Section: Performance Comparisonmentioning

confidence: 99%

Compact Muti-Frequency Band-Pass Filters Based on High-Order Mode of Folded Line Spoof Surface Plasmon Polaritons Waveguide

Yang,

Liu,

et al. 2024

IEEE Access

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“…Therefore, the concept of spoof surface plasmon polariton (SSPP) was proposed by J. B. Pendry et al [22,15]. By creating periodic grooves or hole arrays on metals, SSPP can be excited in the terahertz and lower frequency bands, enabling the application of SSPP in frequency bands below the optical band [16].…”

Section: Introductionmentioning

confidence: 99%

Compact Broadband Low-pass Filter with Novel Fishbone Structure Based on Spoof Surface Plasmon Polariton

Xu,

Nian,

Deng

et al. 2024

PIER M

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A compact spoof surface plasmon polariton (SSPP) low-pass filter is proposed. By adopting a novel fishbone structure, the effective depth of the groove is increased, reducing the filter width by 24.84%. The length of the filter is reduced by 22.23% with a new transmission structure. To intuitively display this structure, the filter is designed and fabricated. The area of the filter is 47.44 mm×8 mm. The results demonstrate that the insertion and return losses are less than 3 dB and greater than 13 dB, respectively, in a wideband range of 0-10.00 GHz

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“…However, additional transition structures are always needed to connect the feeding microstrip line segment with the SSPP transmission segment for wave vector matching and mode conversion, resulting in a large size in the longitudinal direction. Then, the high-order mode of SSPPs is used to construct a desirable bandpass response without transition structure [28,29], but the frequency of the high-order mode is twice as high as that of the fundamental mode, which is also adverse to the circuit miniaturization. Besides, a wide upper stopband is preferable in modern communication systems for rejecting high frequency interference.…”

Section: Introductionmentioning

confidence: 99%

Compact wideband filter with wide stopband using transition-free spoof surface plasmon polaritons

Ren,

Qin,

Guan

et al. 2023

J. Phys. D: Appl. Phys.

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In this article, a newly spoof surface plasmon polaritons (SSPPs) is proposed and used to design a compact wideband bandpass filter (BPF). Different from the traditional SSPPs unit cell with one shaped structure, the unit cell of the proposed SSPPs consists of H-shaped slotline and a bilateral T-shaped slotline. Benefiting from the hybrid structure, no transition portion is needed for impedance matching in the design of microwave filter, which highly reduces the horizontal size of SSPPs-based filter. The transition structure of microstrip to slotline provides a capacitance with highpass frequency response, which enables the realization of a passband by cooperating with the natural lowpass property of SSPPs. Also, the upper and lower cutoff frequencies of the proposed filter can be adjusted independently by the key parameters. Besides, a wide upper stopband can be obtained by properly designing the SSPPs unit cell and the microstrip to slotline structure. Finally, the well-designed BPF operated at 1.3-6.2 GHz and its upper stopband rejection reaching 20 GHz is fabricated and measured. The test results are in good agreement with the simulations, which verifies the feasibility of the proposed structure and design method.

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Miniaturized Bandpass Filter Based on High-Order Mode of Spoof Surface Plasmon Polaritons Loaded With Capacitor

Cited by 7 publications

References 32 publications

Compact Muti-Frequency Band-Pass Filters Based on High-Order Mode of Folded Line Spoof Surface Plasmon Polaritons Waveguide

Compact Muti-Frequency Band-Pass Filters Based on High-Order Mode of Folded Line Spoof Surface Plasmon Polaritons Waveguide

Compact Broadband Low-pass Filter with Novel Fishbone Structure Based on Spoof Surface Plasmon Polariton

Compact wideband filter with wide stopband using transition-free spoof surface plasmon polaritons

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