CAD of Bandpass Characteristics of Microwave Duplexer Tube (TR Tube)
天线开关管频率特性的计算机辅助设计

The simulation calculation with the computer using FORTRAN language for frequency characteristics of the microwave duplexer tube (TR tube) is described in this paper. It is based on the theory of microwave four terminal networks with lumped parameter elements. The theoretical equations expressing the frequency charcteristics of TR tube is given firstly. Then the effects of some factors, such as the staggered tuning, the length of coupling transmission lille, and the element loss on the frequency characteristics are calculated and discussed. The optimum values of staggered tuning and optimum length of the line of a four-resonate-element TR tube are given, and compared with the experimental data. In the program, the optimum parameters of the TR tube can be chosen automatically, and the curve of frequency characteristics is directly shown in the screen. The calculating model and method are also suitable for conventional microwave filter.