给出多级级联网络的功率传输增益表达式。以该表达式为基础,提出微波多级FET宽带放大器的实频直接设计法。这一方法无需负载及FET的数学模型,只需知道其实频参数(阻抗或散射参数)即可。适当选择匹配网络的拓扑结构,即可进行优化设计,物理概念清晰,应用简便。宽带匹配网络可以计及集总元件的频率依变损耗,从而有利于提高微波宽带放大器的设计精度。 The power transfer gain expression of multi-level cascaded networks is given. Based on the expression, a direct digital design method of microwave multi-stage FET wideband amplifier is proposed. This method does not require a load and FET mathematical model, just know the actual frequency parameters (impedance or scattering parameters) can be. Appropriate selection of the topological structure of the network, you can optimize the design, the physical concept of clear, easy to use. The broadband matching network can account for the frequency dependent loss of the lumped components, which is beneficial to improve the design precision of the microwave broadband amplifier.