高频电子线路中阻抗匹配与变换的分析

Anal3ysis of Impedance Conversion and Impedance Matching in High Frequency Circuit

为了在传输电路进行最高效的传输,通常会让负载阻抗和激励信号的内阻抗形成一种相互匹配的关系,这种阻抗匹配关系体现了输出、输入回路之间的功率传输效果,会让传输线路取得最大传输功率。文章利用归纳、推演的分析方法,集中地剖析了几种常见电路的阻抗变换过程,并介绍了阻抗匹配的分类。通过对电路的分析得到了阻抗变换与匹配的一搬规律。通过对高频电路中阻抗变换的分析,得出在实际电路中要实现阻抗匹配,即要在前级网络与后级网络中间增加一个匹配网络或匹配电路的结论。

The transmission circuit for the most efficient transmission, tend to make internal impedance and load impedance of the excitation signal to form a mutual matching relationship, the impedance matching relations reflects the power transmission effect between input and output circuits, will make the transmission line to obtain the maximum transmission power. In this paper, the analysis method of induction and deduction is used to analyze the impedance transformation of several common circuits, and the classification of impedance matching is introduced. On this basis, the general rules are summed up by formula derivation for specific circuits. Based on the analysis of impedance transformation in high frequency circuit, it is concluded that impedance matching in practical circuits is the conclusion that a matching circuit or matching network is added between the former and the latter.