Open AccessCompact microstrip lowpass filter with wide stopband and very‐sharp roll‐off
Author(s) -
Hayati M.,
Akbari M.,
Salahi R.
Publication year - 2016
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.2016.0191
Subject(s) - stopband , passband , transition band , low pass filter , elliptic filter , microstrip , insertion loss , materials science , filter (signal processing) , chebyshev filter , resonator , acoustics , band stop filter , band pass filter , prototype filter , optics , physics , optoelectronics , engineering , electrical engineering
A novel microstrip lowpass filter (LPF) with good specifications such as wide stopband and sharp roll‐off is reported. The filter structure consists of split ring resonator loaded by folded polygene patches. The proposed filter with −3 dB cut‐off frequency at 1.57 GHz has been designed, fabricated and measured. The LPF has a wide stopband from 1.67 to 14 GHz with a rejection level greater than −20 dB, sharp roll‐off rate equal to 170 dB/GHz and low insertion loss lower than 0.13 dB in 94% of the passband. Finally, a high figure of merit of 51,178 is obtained.