Open AccessHighly‐selective pseudoelliptic filters based on dual‐mode substrate integrated waveguide resonators
Author(s) -
Liu Qing,
Zhou Dongfang,
Wang Shuxing,
Zhang Yi
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2016.1517
Subject(s) - resonator , passband , band pass filter , dual mode , coupling coefficient of resonators , degenerate energy levels , coupling (piping) , waveguide , mode (computer interface) , materials science , mode coupling , waveguide filter , filter (signal processing) , substrate (aquarium) , optoelectronics , physics , optics , electronic engineering , prototype filter , engineering , computer science , filter design , electrical engineering , oceanography , geology , operating system , quantum mechanics , metallurgy
A non‐degenerate dual‐mode resonator derived from circular substrate integrated waveguide is proposed, and two pseudoelliptic bandpass filters with non‐resonant mode based on the dual‐mode resonators are presented. Two resonant modes (higher order modes) are employed to degenerate a passband, while a non‐resonant mode (fundamental mode) is designed to provide a direct input‐to‐output coupling. Owning to an additional path provided by non‐resonant mode, the filters have good selectivity and very compact size. The presented simulation and measurement results are in good agreement.