Open AccessCompact dual‐band filter using interleaved folded half‐mode substrate integrated waveguide resonator
Author(s) -
Guo Jun,
You Bin,
Zhang Xiao Hong,
Luo Guo Qing
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.6195
Subject(s) - passband , resonator , multi band device , bandwidth (computing) , band pass filter , materials science , filter (signal processing) , coupling (piping) , optics , waveguide , waveguide filter , optoelectronics , acoustics , physics , prototype filter , computer science , low pass filter , telecommunications , engineering , electrical engineering , antenna (radio) , metallurgy
A multi‐layer interleaved folded half‐mode substrate integrated waveguide (HMSIW) dual‐band filter is proposed. The TE 101 and TE 102 mode of the HMSIW resonators form dual‐band response by vertical coupling, and the bandwidth of the two passbands can be independently designed by adjusting the coupling apertures. Moreover, three transmission zeros (TZs) are obtained to improve out‐of‐band rejection, and the TZs can be flexibly designed below or above the passband. By vertically superimposing the HMSIW cavity, the HMSIW filter can be extended to multi‐pole dual‐band filters. A dual‐band filter with centre frequency of 3.05 and 4.7 GHz was fabricated and measured to verify the proposed method. The simulated and measured results are in good agreement.