A Miniaturized LPF with Sharp Transition-band Using Semi-circle Resonators

作者：Roshani Saeed; Golestanifar A R; Ghaderi A H; Roshani Sobhan

来源：Applied Computational Electromagnetics Society Journal, 2017, 32(4): 344-351.

• L-band
• LPF
• open stub
• semi-circle resonator
• sharp transition-band

In this paper, a miniaturized microstrip low-pass filter (LPF) with sharp transition-band, wide stop-band and negligible insertion-loss in pass-band is proposed using semi-circle and butterfly resonators. The cutoff frequency of the proposed LPF is 1.75 GHz. The proposed LPF presents a wide stop-band from 2.1 to 23.73 GHz (2nd-14th harmonics) with -20 dB attenuation level. The overall dimension of the proposed filter is 0.11 lambda(g) X 0.1 lambda(g). The sharpness of transition-band is 112 dB/GHz, from 1.75 to 2.26 GHz with corresponding attenuation levels of-3 dB and -60 dB, respectively. The insertion-loss in pass-band is less than 0.05 dB. The proposed LPF is simulated, fabricated and measured, which there is a good agreement between the results of simulation and measurement. The LPF has been designed for L-band applications.

• 出版日期2017-4