| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Ultra-wideband surface plasmonic bandpass filter with extremely wide upper-band rejection |
| Xue-Wei Zhang(张雪伟), Shao-Bin Liu(刘少斌)†, Qi-Ming Yu(余奇明), Ling-Ling Wang(王玲玲), Kun Liao(廖昆), and Jian Lou(娄健) |
| 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 |
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Abstract An ultra-wideband bandpass filter (BPF) with a wide out-of-band rejection based on a surface plasmonic waveguide (SPW) slotline with ring grooves is designed and analyzed. A paired microstrip-to-slotline transition is designed for quasi-TEM to TM mode conversion by using a microstrip line with a circular pad and the slotline with the same circular slot. The mode conversion between the TM and the surface plasmon polariton (SPP) mode is realized by using a gradient slotline with ring grooves and an impedance matching technique. The upper cut-off frequencies of the passband can be adjusted by using these proposed SPP units, while the lower frequencies of the passband are created by using the microstrip-to-slotline transitions to give an ultra-wideband BPF. The dispersion curves of SPP units, electric field distribution, and the transmission spectra of the proposed ultra-wideband bandpass filter are all calculated and analyzed by the finite-difference time-domain (FDTD) method. The simulated results show that the presented filter has good performance including a wide 3-dB bandwidth of 149% from 0.57 GHz to 3.93 GHz, an extremely wide 40-dB upper-band rejection from 4.2 GHz to 18.5 GHz, and low loss and high selectivity in the passband. To prove the design validity, a prototype of the BPF has been manufactured and measured, showing a reasonable agreement with simulation results. The unique features of the proposed BPF may make it applicable for integrated circuit and plasmonic devices in microwave or THz frequency ranges.
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Received: 07 December 2021
Revised: 13 February 2022
Accepted manuscript online: 23 March 2022
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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. U2141232, 62071221, and 62071442) and the Aeronautical Science Foundation of China (Grant No. 2019ZA037001). |
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), Qi-Ming Yu(余奇明), Ling-Ling Wang(王玲玲), Kun Liao(廖昆), and Jian Lou(娄健) Ultra-wideband surface plasmonic bandpass filter with extremely wide upper-band rejection 2022 Chin. Phys. B 31 114101
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