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一、圆图概说阻抗圆图是根据无耗传输线的理论得来的,在分析传输线及波导的匹配问题时,若能熟练地应用它,可使计算大为简化.阻抗圆图(图1)的概况,可归纳为下列几点(阅读本文时,请备一张详细圆图以对照): 1.归一化阻抗:阻抗圆图上所示的电阻成分及电抗成分,均以归一化阻抗的形式标出.它是某一个已知阻抗除以特性阻抗所得的商.例如,已知波导的特性阻抗Z_0=384欧,若负载阻抗Z_1=(200+j100)欧,则它的归一化阻抗为Z’=R’+jX’=Z_1/Z_0=0.52+j0.26.式中R’称为归一电阻,X’称为归一电抗.
Impedance chart is based on the theory of lossless transmission line obtained in the analysis of the transmission line and waveguide matching problem, if you can skillfully use it, the calculation can be greatly simplified. Impedance diagram (Figure 1 ) Overview, can be summarized as the following points (read this article, please prepare a detailed diagram of the circle to control): 1. Normalized impedance: Impedance diagram shown on the resistance and reactance components are normalized For example, it is known that the characteristic impedance of a waveguide Z_0 = 384 ohms, and if the load impedance Z_1 = (200 + j100) ohms, its The normalized impedance is Z ’= R’ + jX ’= Z_1 / Z_0 = 0.52 + j0.26, where R’ is the normalized resistance and X ’is the normalized reactance.