宽阻带超宽带带通滤波器的设计

Design on the Ultra-wide Band Bandpass Filter with Broad Stopband

提出了一种新型结构的超宽带带通滤波器。这种滤波器结构基于最优的短路支节传输线滤波器,短路支节之间的连接线替换成一种层叠结构的阶跃阻抗发夹线。阶跃阻抗发夹线谐振器的低通滤波性能较好地实现了滤波器的阻带衰减,而对滤波器的通带传输特性影响小。由于阶跃阻抗发夹线的慢波特性,滤波器的尺寸在长度上缩减了23%,其结构更加紧凑。

A novel ultra-wideband （UWB） bandpass filter is presented in this paper,which is based on a circuit model for an optimum short-circuited stub transmission-line filter, whose unit elements or connecting lines are substituted by the stepped impedance hairpin resonator with the cascaded structure. The stepped impedance hairpin resonator has the property of lowpass filter, which implement rightly the stopband attenuation for the UWB filter and the influence for its passband transmission property is little. Because of the slow-wave characteristic of the stepped impedance hairpin, the UWB filter length is reduced by 23%, and the structure is more compact.