Open AccessTri‐section stepped‐impedance resonator filter with controllable mixed electric and magnetic cross‐coupling
Author(s) -
Wan Xin Wen,
Li Min Quan
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.2016.4215
Subject(s) - stopband , resonator , coupling (piping) , materials science , filter (signal processing) , electrical impedance , inductive coupling , capacitor , acoustics , topology (electrical circuits) , wavelength , electronic engineering , optoelectronics , electrical engineering , engineering , physics , voltage , metallurgy
A novel tri‐section stepped‐impedance resonator (SIR) filter with controllable mixed electric and magnetic cross coupling is proposed. Two quarter‐wavelength shorted‐end SIRs and one half‐wavelength SIR are used to realise tri‐section topology. The electric and magnetic couplings in mixed cross coupling can be controlled by the inter‐digital capacitor structure and the gap between shorted lines, respectively. Then, additional transmission zeros can be obtained for better frequency selectivity and high rejected level in stopband. One filter sample is designed and fabricated with single‐layer PCB. Good agreements are achieved between the measured and simulated S ‐parameters.