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自本世纪三十年代至四十年代后期,有关经典传输线基本理论的若干主要方向即相继确立并逐步臻于完美而形成一章比较系统的理论——“长线”。在该章的最后两节,一般安排了圆图的构成和各类基本应用。众所周知,在传输线工作状态计算,阻抗匹配,某些微波元件的分析与设计以及微波测量等方面都广泛地使用 P.H.Smitn 圆图。历史地看,当时把阻抗(导纳)和反对系数等参数画成曲线一圆图,的确给传输线的工程计算带来了极大的方
Since the 1930s to the late 1940s, a number of major directions have been established and gradually perfected to form a more systematic theory - “long-term”. In the last two sections of the chapter, the composition and various basic applications of a round chart are generally arranged. It is well known that the P.H.Smitn chart is widely used in the calculation of transmission line operating conditions, impedance matching, the analysis and design of certain microwave components, and microwave measurement. Historically, the parameters of impedance (admittance) and the coefficient of opposition were plotted as a curve-and-circle diagram at that time, which indeed brought a great deal of engineering calculation to the transmission line