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Two miniaturized triple‐band filters based on 90 0 sector substrate integrated waveguide
Author(s) -
Zhang Sheng,
Guo Ya,
Zhou YuYu,
Hong JiaSheng
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32532
Subject(s) - miniaturization , substrate (aquarium) , coupling (piping) , materials science , waveguide , band pass filter , optoelectronics , layer (electronics) , filter (signal processing) , cascade , waveguide filter , multi band device , center frequency , optics , physics , prototype filter , electrical engineering , engineering , low pass filter , nanotechnology , metallurgy , oceanography , chemical engineering , antenna (radio) , geology
Two kinds of triple‐band filters based on 90 0 sector substrate integrated waveguide (SSIW) are firstly investigated. The resonant frequencies of SSIW are deduced by analogy with a circular SIW cavity. By contrast, SSIW cavity is not only easier to suppress higher‐order modes than the circular SIW cavity, but also easier to cascade multiple cavities. Two kinds of miniaturization filters are realized by using dual‐layer and single‐layer half‐mode structures, respectively. Dual‐layer triple‐band filter is realized by using TM 110 , TM 120 , and TM 210 . The single‐layer triple‐band filter based on half‐mode SSIW is proposed for further miniaturization. It adopts higher order modes (TM 110 , TM 120 , and TM 310 ) to achieve triple‐band response. Moreover, it introduces a W‐shaped coupling slotline, which not only makes lower original resonant frequencies, but also increases the coupling strengths. Source and load coupling (S‐L‐C) and CSRR are introduced for improving the selectivity of the proposed two filters. Finally, both filters have been fabricated. The measured results are in line with the simulated ones.