Open AccessDesign of LPF with UW stopband and sharp roll‐off rate using transfer function analysis
Author(s) -
Vaezi A.,
Geran Gharakhili F.
Publication year - 2018
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.2017.4144
Subject(s) - stopband , transfer function , transfer (computing) , function (biology) , control theory (sociology) , physics , computer science , acoustics , electrical engineering , engineering , optics , band pass filter , artificial intelligence , biology , control (management) , evolutionary biology , parallel computing
A novel microstrip lowpass filter with outstanding features is designed, simulated, fabricated and analysed. The proposed structure has the capability to improve frequency response in transition band and remove the 13th unwanted harmonics in the stopband. The proposed design comprises many resonators and cell attenuators. It features an UW stopband, high suppression factor and high sharp roll‐off. To adjust the cut‐off frequency, the transfer function and LC equivalent circuit of the main resonator are calculated. Results show that cut‐off frequency and relative bandwidth of stopband of the filter are 2 GHz and 171%, respectively. Also, insertion loss <0.11 dB and return loss more than 18 dB have obtained for filter form DC to 2 GHz. The fabricated filter reaches a high figure of merit of 72,093.