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http://dx.doi.org/10.4218/etrij.11.0210.0493

Microstrip Lowpass Filter with Very Sharp Transition Band and Wide Stopband  

Hayati, Mohsen (Electrical Engineering Department, Razi University)
Sheikhi, Akram (Electrical Engineering Department, Razi University)
Publication Information
ETRI Journal / v.33, no.6, 2011 , pp. 981-984 More about this Journal
Abstract
A novel lowpass filter with a very sharp transition band and wide stopband is proposed. The proposed filter is based on T-shaped patches which are etched in symmetrical structures and folded open stub. To obtain a wide stopband, we have used stub loaded semi-circle stepped-impedance structures. By designing the resonator with high inductance and capacitance, a very sharp transition band is achieved. The proposed filter has a 3-dB cutoff frequency at 2.37 GHz and a 40-dB rejection at 2.44 GHz. The stopband with an attenuation level better than -13.2 dB is up from 2.4 GHz to 16 GHz, and consequently we have reached the high and wide rejection in stopband with compact size. Good agreements between the simulated and the measured results are presented.
Keywords
Microstrip lowpass filter; open stub; transition band; wide stopband;
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