接地金属化孔对交指带通滤波器频响的影响分析

接地金属化孔对交指带通滤波器频响的影响分析

内容简介：用微带线结构实现有接地端的交指带通滤波器时,接地金属化孔的寄生电感效应将影响带通滤波器的幅频特性。寄生电感的大小可由经验公式近似计算,借助于三维电磁场仿真软件,可以计算出当接地金属化孔的排列方式不同时,由寄生电感引起的带通滤波器中心频率偏移量也不同。接地金属化孔排列引起的寄生电感越小,带通滤波器的中心频率越接近于理论值,因此在设计有接地金属化孔的交指带通滤波器时,需根据所选用的金属化孔排列结构修正滤波器中心频率的偏移。

Abstract：When interdigital bandpass filter with grounding ends is designed for microstrip implementa-tion,the parasitic inductance of grounding via holes inevitably influences frequency response of bandpass filter.Equivalent inductance of isolated grounding via holes is computed by approximate formula,howev-er,availability of 3D electromagnetic field solver provides an opportunity to analyze the center frequency shift of bandpass filter with different form of grounding via holes.Small parasitic inductance is often used to decrease the center frequency shift.Thereby,when we design a interdigital bandpasss filter with grounding via holes,we must correct the shift based on form of ground via holes.

作者：张娜, 李元,

关键词：交指带通滤波器, 接地金属化孔, 寄生电感