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Chin. Phys. B, 2022, Vol. 31(11): 114101    DOI: 10.1088/1674-1056/ac6015

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
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.
Keywords:  surface plasmonic waveguide (SPW)      bandpass filter      out-of-band rejection      ultra-wideband  
Received:  07 December 2021      Revised:  13 February 2022      Accepted manuscript online:  23 March 2022
PACS:  41.20.Jb (Electromagnetic wave propagation; radiowave propagation)  
  84.40.Dc (Microwave circuits)  
  84.40.Az (Waveguides, transmission lines, striplines)  
  73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))  
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:,

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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