Open AccessMiniaturised QMSIW filter using comb line with high out‐of‐band rejection
Author(s) -
Nie Xinghe,
Hong Wei
Publication year - 2017
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.2017.0899
Subject(s) - filter (signal processing) , planar , waveguide filter , materials science , band pass filter , comb filter , capacitance , m derived filter , optoelectronics , electronic engineering , optics , prototype filter , filter design , computer science , engineering , electrical engineering , physics , computer graphics (images) , electrode , quantum mechanics
This Letter proposes a miniaturised filter that makes use of quarter‐mode substrate‐integrated waveguide (QMSIW) combining with a comb‐line architecture for the first time. The comb‐line QMSIW filter uses a periodic structure of distributed capacitance thereby reducing the size of the conventional QMSIW filter. To enhance out‐of‐band rejection, an S‐shaped slot is introduced to realise negative coupling. Using the above principles, the size of this filter is reduced by nearly half (compared with conventional QMSIW filters) while having high out‐of‐band rejection. Finally, this planar, miniaturised filter is designed and fabricated. The measured results match well with simulated results.