最大传输功率之再探究

Reconsideration of Maximum Power Transfer Law

在信号传输时,功率是考虑的重要因素之一。在教材中最大功率传输定理的基础上,对正弦稳态下的最大传输功率做了更深入的讨论,得出了戴维南阻抗和负载在三种特殊限制条件下的最大传输功率。介绍了在负载不能任意改变的情况下,为实现最大功率传输而通常选用的三种LC匹配网络:"L"型匹配网络、"T"型匹配网络和"π"型匹配网络,并经讨论得出三种匹配网络本质上是一种网络,即"L"型匹配网络。

In the signal transmission,power is one of the most important factors to be considered. The first part of the paper discusses on sinusoidal steady-state maximum power transmission on the basis of the maximum power transfer theorem,and works out the maximum power transfer of Thevenin＇s equivalent resistance under three specific boundary conditions. The second part of the paper introduces three typical LC matching networks used to achieve maximum power transfer under the circumstances in which the load cannot be changed arbitrarily： the＂L＂matching network,the＂T＂matching network and＂π＂matching network,and discuss the three matching networks are essentially a network that is ＂L＂matching network.