Open AccessDesign of microstrip lowpass filter with wide stopband and sharp roll‐off using hexangular shaped resonator
Author(s) -
Hayati M.,
Gholami M.,
Vaziri H.S.,
Zaree T.
Publication year - 2015
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.2014.3853
Subject(s) - stopband , microstrip , low pass filter , resonator , filter (signal processing) , acoustics , electronic engineering , elliptic filter , passband , materials science , band pass filter , prototype filter , electrical engineering , physics , engineering , optoelectronics
A compact lowpass filter using a hexangular shaped resonator is presented. The designed lowpass filter has a −3 dB cutoff frequency of 2.97 GHz. The stopband bandwidth for the attenuation level of −20 dB is from 3.32 GHz up to 21 GHz, and the circuit only occupies 10.04 × 10.92 mm 2 . The structure is simulated, fabricated and measured. Both simulation and measured results are presented and compared and there is good agreement between them. The insertion loss in the passband is <0.06 dB and the fabricated filter presents a sharp transition band from 2.97 to 3.32 GHz for the attenuation level of −3 and −20 dB, respectively.