摘要
本文采用矩量法分析了任意截面支臂加载矩形波导T形结。首先根据等效原理将所研究的波导T形结分成两个独立的区域,把这两个区域中的磁场用支臂端口面上的等效磁流源和并矢格林函数的积分形式来表示,根据端口面上磁场切向分量的连续性条件建立了关于等效磁流源的积分方程。然后运用矩量法将该积分方程转化为矩阵方程,求解矩阵方程可得支臂端口面上等效磁流源的近似解。最后由等效磁流源导出了矩形波导T形结的散射参数。文中对两种不同结构的波导T形结在主模激励下的散射特性进行了数值计算,结果与现有文献中给出的数据吻合一致,从而证明了本文方法的有效性。
This paper describes the calculation of the scattering parameters of a T-junction of rectangular waveguide having arbitrary cross-section by the method of moments. An equivalence theorem is first utilized to divide the T-junction investigated here into two separate parts. The magnetic fields in these regions can be represented by the integral form of the equivalent magnetic current over the surface of the junction end of the side arm and the dyadic Green's functions. An integral equation about the magnetic current is set up by applying the continuous condition of tangential components of magnetic field. And then the integral equation is transformed into a set of linear algebraic equations by the method of moments. The approximate solution to the equivalent magnetic current can be obtained by solving this matrix equation. At last the scattering parameters of the T-junction can be derived. The scattering characteristics of the dominant mode excited in two different T-junctions are computed.Numerical results show good agreement with available values in the literature
关键词
波导
微波
电磁波
散射
waveguide,microwave technique,electromagnetic wave scattering, moment problem, T-junction, dyadic Green's functions
