微波功率晶体管的输入阻抗或输出阻抗中有一个实部,还有一个虚部。由于虚部的存在,在测试或使用时,如果匹配不好,在输入端反射功率较大,功率不能完全输入。在输出端被放大了的信号功率也不易完全输出,使管子功率增益不高,集电极效率下降。若能在输入端及输出端设计一个匹配网络,使阻抗中的实部得以提高,而其虚部尽量减少,这样即可减少输入端的反射功率,又能增大管子的输出功率。这样不仅提高了功率增益和集电极效率,而且使电路在测试和使用时调配方便。本文介绍网络匹配的几种形式,以及网络匹配时的条件和阻抗公式的推导。同时还 Microwave power transistor input impedance or output impedance in a real part, there is an imaginary part. Due to the existence of the imaginary part, in the test or use, if the match is not good, reflected power at the input larger, the power can not be fully input. The signal power amplified at the output end is not easy to be output completely, so that the power gain of the tube is not high, and the collector efficiency is decreased. If a matching network can be designed at the input and the output, the real part of the impedance can be increased while the imaginary part of the impedance reduced as much as possible. This reduces the reflected power at the input and increases the output power of the tube. This not only increases the power gain and the collector efficiency, but also makes the circuit easy to configure and test for use. This article describes several forms of network matching and the derivation of the conditions and impedance equations for network matching. Also at the same time