矩形波导中截面微带探针的分析与优化方法

WAVEGUIDE CROSS SECTION PLANE MICROSTRIP PROBE

首先推导出波导探针输入阻抗的一般变分表达式。通过对介质加载波导的并矢格林函数求解，得到了矩形波导中截面探针输入阻抗的积分表达式。该表达式可直接作为分析微带探针或对探针进行优化的依据。利用之中的方法对Ｋａ频段的波导截面探针进行宽带优化设计，经实验验证，得到低插损、小驻波的波导——微带转换结构。

A general expression of incident impedance of probe in waveguide is deduced first.By solving Dyadic Green’s function for dielectric loaded waveguie,the integral equation for in -cident impedance of waveguide cross section plane microstrip probe is obtained.On the base ofthe equation,an analysis and an optimum method is given. This method takes the size and posi-tion of probe as variable parameters,a wide band impedance match optimum processis imployed to realize low VSWR and insert loss of microstrip probe which is verified byexperiments.