Author/Authors :
حياتي، محسن نويسنده , , حاچيان، گلاره نويسنده Electrical Engineering Department, Faculty of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Hajian, Gelareh , شما، فرزين نويسنده Electrical Engineering Department, Faculty of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Shama, Farzin , شهبازتبار، مريم نويسنده Electrical Engineering Department, Faculty of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Shahbazitabar, Maryam
Abstract :
In this paper, a novel lowpass filter with ultra-wide stopband using the butterfly-shaped resonator is proposed. This filter with -3 dB cutoff frequency at 1.74 GHz is designed. Maximum insertion loss is less than 0.1 dB in the passband and the fabricated filter presents ultra-wide stopband from 2.1 GHz to 26.51 GHz with the attenuation level better than -20 dB. The transition band is 0.36 GHz from 1.74 GHz to 2.1 GHz with the attenuation level of -3 dB and -20 dB, respectively. The size of the filter is 0.19? × 0.088? (? is the guide wavelength at cutoff frequency). Good agreements are obtained between the measured and the simulated S-parameters.
