导抗圆图计算与广播电视网络匹配传输设计(1)

Calculating of Conductance and Matching Transmission Design for Radio and TV Network

在广播电视网络匹配传输系统设计计算中 ,广泛应用以电阻、电导、电抗与电纳等构成的高频阻抗匹配网络 ,如在射频与微波领域 ,发射设备的级间耦合电路 ,末级功率放大与馈线间的调配网络等。当需要匹配的阻抗为实数阻抗时 ,网络的设计计算比较简单。但是 ,当需要匹配阻抗的电抗部分不容忽略 ,如晶体管在高频下的应用 ,或与发射天线匹配时 ,则数学计算公式变得较繁杂。现在介绍一种既适用于实数阻抗间又适用于实数与复数阻抗间的集中参数网络匹配的图解导抗圆图设计计算方法。通过理论分析 ,用大量设计实例说明导抗圆图因为比较方便、灵活、高效、快速 。

In the calculating design of radio and TV network matching transmission, the high frequency impedence matching network which made up of reactance, conductance, and are widely used. For example, they are used in the field of radio frequency and microwave, the circuit of coupling of transmit equipments, prepare network between last grade power amplifier and feedback antenna, etc. When the impedance, which is to be matched, is a real number, the calculating and designing of the network are simple. But when the reactance of the impedance should not be ignored, such as the high frequency application of transistor, or when it is matched with transmission antenna, the calculating formular would be more complex. It's not easy to be remembered or to be anylized. A designing and calculating method of diagrammatize of conductance which can be applied in real number impedance circuit as well as in consentrate parameter network matching between real number and complex number impedance is described in detail in this paper. It is anylized theoretically and many examples show that the diagrammatize conductance is convenient, flexible and efficient. It will be a standard designing method for designing and calculating of radio and TV network match transportation.