Open AccessBand‐stop filter based on spoof surface plasmon polaritons
Author(s) -
Zhao Lei,
Liu Shuang,
Wang Jun,
Shen Xiaopeng,
Cui Tie Jun
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.0388
Subject(s) - surface plasmon polariton , optics , microwave , bandwidth (computing) , stripline , filter (signal processing) , materials science , waveguide filter , stopband , optoelectronics , m derived filter , plasmon , band pass filter , surface plasmon , physics , prototype filter , low pass filter , computer science , telecommunications , electrical engineering , engineering
A band‐stop filter based on spoof surface plasmon polaritons for microwave applications is proposed, which can realise high‐efficiency band rejections by etching gradient semi‐circular grooves on both sides of the middle stripline of coplanar waveguide. The operating bandwidth and frequency of band‐stop can be controlled by changing the radii of semi‐circular holes and the length of unit cell, respectively. The operating principle of the designed band‐stop filter is explained by the dispersion curves and electric field distributions. Parametric studies are also conducted to analyse the effects of key parameters on the performance of the band‐stop filter, which is useful for practical designs. A prototype of the band‐stop filter is fabricated and measured. The good agreements between the simulated and measured results validate the proposed design, which indicate that the presented band‐stop filter can be potentially useful in many microwave applications.