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广播电视设备中广泛地使用以电抗元件构成的高频阻抗匹配网络,如发射设备的级间耦合电路,末级功放与天线间的调配网络等。一般地说,当需要匹配的阻抗为实数阻抗时,网络计算是比较简单的。但当需要匹配阻抗的电抗部分不容忽略,如晶体管在高频下运用,或与发射天线匹配时,则数学计算式变得较繁,不便记忆和分析。本文介绍一种即适用于实数阻抗间,又适用于实数阻抗与复数阻抗间的集中参数Γ型匹配网络的图解计算法。实践证明,这种方法简便直观,比较好用。
Widely used in radio and television equipment with high-impedance impedance matching network components, such as transmitting equipment, interstage coupling circuit, the final amplifier and antenna deployment network between the network. In general, when the impedance to be matched is real impedance, the network calculation is relatively simple. However, when the reactance part that needs to match the impedance can not be neglected, such as when the transistor is used at high frequency or matched with the transmitting antenna, the mathematical formula becomes more complicated, which is inconvenient for memory and analysis. This paper presents a graphical method that is suitable for Γ-type matching networks with real parameters between real and impeded impedances and complex impedances. Practice has proved that this method is simple and intuitive, easy to use.