抽头式折叠线SIR带通滤波器设计

提出一种以抽头线方式输入信号的折叠线阶梯阻抗谐振器(SIR),应用低温共烧陶瓷(LTCC)叠层技术实现,可获得大的电容值,缩短谐振腔的长度,实现小型化。分析了输入线抽头的位置对滤波器性能的影响,利用等效的集总电路原理图解释了该结构易在通带右侧出现传输零点的原因。应用二级耦合SIR设计了一个尺寸为2.5mm×2.0mm×0.9mm,中心频率为2.45GHz的带通滤波器,仿真结果显示带内插损小于1.1dB。

Design of tapped bandpass filter with folded line SIR

Proposed a folded line stepped impedance resonator (SIR) with tapped-line, which can get large capacity and reduce the length of the resonator cavity to realize miniaturisation, this resonator was realized by low-temperature cofired ceramic (LTCC) multi-ply technology. The influences of the location of the tapped input line on the filter properties were analyzed. An equivalent lumped circuit principle graph was used to explain the reason of this structure easy appearing transmission zero at pass band right....