Design of wide stopband lowpass filter with sharp roll-off

IEICE Electronics Express

Akram Sheikhi¹  Mohsen Hayati¹ 

[1] Electrical Engineering Department, Faculty of Engineering, Islamic Azad University, Kermanshah Branch

关键词: microstrip;    lowpass filter;    delta stub structure;    sharp response and wide stopband.;   

DOI  :  10.1587/elex.8.1348

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(8)In this paper, a modified semi-circle patch and a semi-circle stepped impedance resonator are cascaded to design a compact lowpass filter with sharp response and wide stopband. This filter has 3-dB cutoff frequency at 1.55GHZ. The transition band is only 0.29GHZ from 1.55 to 1.84GHZ with -3dB and -20dB respectively. Maximum insertion loss is 0.4dB in the passband and stop bandwidth with attenuation level better than -20dB extends from 1.84GHZ up to 12.5GHZ and up to 15GHZ is greater than -10dB, hence wide stopband is achieved. Simulation and measurement results are presented and good agreement between them is achieved. Results show that we have obtained a high Figure-of-Merit (FOM) of 30433.

【 授权许可】

Unknown