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由于传输线阻抗变换公式的复杂性,一般情况下不能直接使用它进行短截线阻抗匹配器的设计。为此提出了一种根据阻抗变换公式构造目标函数,通过求极值的方法解出短截线的位置,进行短截线阻抗匹配器设计的方案。为了克服这个目标函数固有的周期性,非凸性和多值性,对所采用的线性分式插值进行了改进,从而保证了极值的快速收敛。在此基础上开发了一个用于设计短截线阻抗匹配器的程序,它完全可以取代传统的施密特圆图法。给出了这个程序的准代码和设计实例。实验结果表明,采用此方法整个设计过程可以在30 s内完成,速度和精度远远超过传统的设计法。
Due to the complexity of the transmission line impedance transformation formula, it is generally not possible to directly use it to design a stub impedance matching device. For this reason, a scheme of constructing the objective function according to the impedance transformation formula and solving the stub of the stub by calculating the extremum is proposed. In order to overcome the inherent periodicity, non-convexity and multi-valued of this objective function, the linear fractional interpolation adopted is improved to ensure the rapid convergence of the extreme value. Based on this, a program for designing a stub impedance matcher was developed, which can completely replace the traditional Schmidt chart method. Given the quasi-code and design examples of this procedure. The experimental results show that the whole design process can be completed within 30 seconds with this method, the speed and accuracy far exceed the traditional design method.