复合结构偏心对同轴波导电磁特性的影响

Effects of Composite Structure Eccentric in a Coaxial Waveguide Electromagnetic Performance

采用三维电磁仿真软件CST Microwave Studio,数值模拟了内外导体轴线复合结构偏心对同轴波导电磁特性的影响。结果表明:当内外导体的轴线同时存在平行偏心和倾斜偏心时,改变了波导的边界条件,从而导致同轴波导的S21参数和电场幅值实质性下降。随着复合结构偏心程度的加剧,同轴波导的S21参数和电场幅值减小越大。同时,复合结构偏心比平行偏心或倾斜偏心单独存在时对同轴波导电磁性能的影响更大。因此,在同轴波导的实际制作过程中,应尽力避免发生复合结构偏心。

In this paper the effects of composite structure eccentric in an open coaxial waveguide is studied by means of the software CST microwave studio. The results show that composite structure eccentric between the inner-rod axis and the out- er-wall axis changes the boundary conditions of the waveguide, it causes substantial decrease of the field amplitude and $2~ parameter. With the degree of composite structure eccentric increase, the reduced of $21 parameter field profile of TEM modes of coaxial waveguide become more. While, the effects of composite structure eccentric in coaxial waveguide TEM modes electromagnetic performance is more serious than parallel or oblique eccentric existed alone. Therefore, in the actual process of making a coaxial waveguide, the occurrence of the composite structure of eccentric should be avoided.