Open AccessCompact tunable bandpass filter with wide tuning range using ring resonator and short‐ended coupled lines
Author(s) -
Zhu H.,
Abbosh A.
Publication year - 2015
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.2015.0346
Subject(s) - stopband , band pass filter , bandwidth (computing) , resonator , elliptic filter , materials science , prototype filter , harmonic , filter (signal processing) , cutoff frequency , electronic filter topology , electronic engineering , acoustics , optoelectronics , optics , physics , low pass filter , engineering , electrical engineering , telecommunications
A tunable bandpass filter with wide tuning ranges for both the centre frequency and bandwidth is presented. The filter is based on using a ring resonator connected to a short‐ended coupled‐line structure. Two transmission zeros are generated in the upper stopband resulting in a sharp cutoff and harmonic suppression across a wide stopband. A thorough procedure is used to analyse the proposed filter. A prototype is fabricated and tested. The achieved results indicate a wide centre frequency and bandwidth tuning ranges of 0.52–1.42 GHz and 90–320 MHz, respectively.