Open AccessDesign of a narrow dual‐band BPF with an independently‐tunable passband
Author(s) -
Mousavi S.M.H.,
Makki S.V.A.,
Alirezaee Sh.,
Malakooti S.A.
Publication year - 2019
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.2019.0562
Subject(s) - passband , band pass filter , stopband , resonator , elliptic filter , transition band , physics , filter (signal processing) , electronic engineering , prototype filter , acoustics , computer science , optics , bandwidth (computing) , telecommunications , low pass filter , engineering , electrical engineering
Using polygonal resonators and bended lines, a new type of dual‐band bandpass filter (BPF) is presented generating a fixed passband centred at 2.70 ( f 01 ) and an independently‐electronically tunable passband ( f 02 ) which can be tuned between 3.65 and 6.51 GHz (56% tuning range). The measured results indicate that the return losses of both passbands are >21 dB throughout the tuning range. Furthermore, the use of bended lines leads to extremely small size of 0.136 × 0.098 λ g 2 , where λ gis the guided wavelength at the lowest working frequency ( f 01 ). The proposed BPF also benefits from an ultra‐wide upper stopband from 7.03 up to 14.41 GHz (based on 21 dB points), suppressing unwanted signal by more than 21 dB considered as a positive point. The filter prototype is investigated in four design stages with the LC analysis to support the design process theoretically and fabrication results to validate the design practically.