一引言微波电路,往往既包含有集中参数元件,又包含分布参数元件,其频率特性比较复杂。一般很难用经典方法,按给定要求去综合电路。另外,在微波电路的制造过程中,常采用微带电路,在大多数情况下,电路没有调谐余地,修改电路比较困难,因此在制造以前,必须非常精确地设计电路参数,否则所得出的特性会大大偏离设计要求。随着表征器件的模型和自动测试技术的发展,目前已能用S参数来表征微波波段的有源器件,这就为微波网络的计算机辅助设计创造了条件。 An introduction Microwave circuits, often contain both centralized parameters and distributed parameters, the frequency characteristics of more complex. Generally difficult to use the classic method, according to the given requirements to synthesize the circuit. In addition, the microstrip circuit is often used in the manufacture of microwave circuits. In most cases, the circuit does not have room for tuning and it is difficult to modify the circuit. Therefore, the circuit parameters must be designed very accurately before manufacturing, otherwise the resulting characteristics Will deviate greatly from the design requirements. With the development of characterization device models and automatic testing techniques, S-parameters have now been used to characterize active devices in the microwave band, which has created the conditions for computer-aided design of microwave networks.