| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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High-confinement ultra-wideband bandpass filter using compact folded slotline spoof surface plasmon polaritons |
| Xue-Wei Zhang(张雪伟)1, Shao-Bin Liu(刘少斌)1,†, Ling-Ling Wang(王玲玲)1, Qi-Ming Yu (余奇明)1, Jian-Lou(娄健)1, and Shi-Ning Sun(孙世宁)2 |
1 College of Electronic and Information Engineering, Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
2 AVIC Research Institute for Special Structures of Aeronautical Composite, Aviation Key Laboratory of Science and Technology on High Performance Electromagnetic Windows, Jinan 250023, China |
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Abstract A novel bandpass filter (BPF) based on spoof surface plasmon polaritons (SSPPs) using a compact folded slotline structure is proposed and experimentally demonstrated. The proposed novel SSPPs structure compared with a conventional plasmonic waveguide with slot line SSPPs unit structure at the same size, the considerable advantages in much lower asymptotic frequency with tight field confinement, which enable the proposed filter to be more miniaturization. A high-efficient mode conversion structure is designed to transition from TE-mode to SSPPs-mode by gradient slotline lengths. The low-frequency stop-band can be committed with microstrip to slotline evolution on both sides of the dielectric, while the high-frequency cutoff band is realized by the proposed SSPPs structure. The influence of dispersion relation, electric field distribution, surface current, and structural parameters on the transmission characteristics of the proposed BPF are analyzed by finite difference time domain (FDTD). To validate the design concept, the prototype of the miniaturized SSPPs BPF has been manufactured and measured. The experimental results show high performance of the fabricated sample, in which the working in a range of 0.9 GHz-5.2 GHz with the relative bandwidth is 142%, the insertion loss less than 0.5 dB, the reflection coefficient less than -10 dB, and the group delay is less than one ns. This works provides a mirror for realizing the miniaturization of waveguides, and the application and development of high-confinement SSPPs functional devices in the microwave and THz regimes.
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Received: 27 July 2021
Revised: 25 August 2021
Accepted manuscript online: 01 September 2021
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PACS:
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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84.40.Dc
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(Microwave circuits)
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84.40.Az
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(Waveguides, transmission lines, striplines)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62071221 and 62071442), the Equipment Advance Research Foundation of China (Grant No. 80909010302), and the Key Laboratory of Radar Imaging and Microwave Photonics (Nanjing University of Aeronautics and Astronautics), Ministry of Education of China (Grant No. NJ20210006). |
Corresponding Authors:
Shao-Bin Liu
E-mail: plrg@nuaa.edu.cn,lsb@nuaa.edu.cn
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Cite this article:
Xue-Wei Zhang(张雪伟), Shao-Bin Liu(刘少斌), Ling-Ling Wang(王玲玲), Qi-Ming Yu (余奇明), Jian-Lou(娄健), and Shi-Ning Sun(孙世宁) High-confinement ultra-wideband bandpass filter using compact folded slotline spoof surface plasmon polaritons 2022 Chin. Phys. B 31 014102
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