Open AccessLow insertion loss wideband bandpass filter with six transmission zeros
Author(s) -
Chen FuChang,
Qiu JieMing,
Chen ZhiHan,
Chu QingXin
Publication year - 2013
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.2013.0655
Subject(s) - insertion loss , passband , band pass filter , stopband , prototype filter , band stop filter , bandwidth (computing) , wideband , electronic filter topology , materials science , elliptic filter , butterworth filter , voltage controlled filter , electronic engineering , high pass filter , optics , low pass filter , optoelectronics , physics , computer science , telecommunications , engineering
A modified wideband bandpass filter based on a bandstop filter is realised using half‐wavelength and one‐wavelength open‐circuited resonators. Six transmission zeros are utilised to obtain the sharp rejection characteristics over a broad stopband. The passband bandwidth can be varied by changing the impedance of the configuration. A compact prototype filter with 27% bandwidth is demonstrated. Without coupling gaps between resonators, the new filter shows low insertion loss and is easy for fabrication. To illustrate the concept, a bandpass filter is designed, fabricated and measured. Simulated and measured results are found in good agreement with each other.