Open AccessUltra‐wideband bandpass filter using multi‐stub‐loaded ring resonator
Author(s) -
Lin Lei,
Yang Shuai,
Sun ShouJia,
Wu Bian,
Liang ChangHong
Publication year - 2014
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.2014.1256
Subject(s) - stub (electronics) , resonator , band pass filter , wideband , acoustics , electronic engineering , split ring resonator , materials science , ultra wideband , physics , optoelectronics , engineering
A compact ultra‐wideband (UWB) bandpass filter (BPF) using a multi‐stub‐loaded ring resonator is presented. The resonant frequencies of the proposed resonator can be tuned freely by changing the lengths of the corresponding stubs. By utilising the proposed multimode resonator, four resonant frequencies are evenly allocated in the UWB range and two transmission zeros are introduced at the lower and upper stopbands. Parallel‐coupled feedlines with defected ground structures were utilised to provide sufficient external coupling. To validate the design theory, an UWB BPF operating in the frequency range from 3.1 to 10.6 GHz was designed, analysed and fabricated. Measurements showed good agreement with simulations.