W频段波导功率分配器的设计

Design of Waveguide Power Divider at W Band

波导功率分配器是微波、毫米波系统中常用的重要部件,但是传统匹配结构因加工困难而在W频段很难实现.文中首先利用基于亥姆霍兹方程弱形式的有限元法设计了一种圆弧匹配结构,该结构的半径为铣床刀头的半径,故其轮廓与铣床刀头的外边缘匹配,可以方便地在普通铣床上加工,有效地降低制作成本;然后采用两对圆弧和三对圆弧的匹配结构分别设计了H面和E面波导功率分配器.该功率分配器散射参数的计算结果与实验结果吻合得很好,表明文中的设计方法具有很好的工程应用价值.

As for the waveguide power divider, an important component in microwave and millimeter wave systems, its traditional matching structure is difficult to realize at W band due to the machining difficulties. In order to solve this problem, this paper proposes an arc structure via the finite element method based on the weak form of Helmhohz equation. As the radius of the arc structure is that of the milling cutter, the structure contour matches well with the outer fringe of milling cutter and can be easily manufactured with a common milling machine, thus effectively reducing the manufacture cost. Moreover, a H-plane waveguide power divider and an E-plane one are designed using two pairs of arcs and three pairs of arcs, respectively. It is proved that the proposed design method is of engineering applicability because the calculated scattering parameters accord well with the experimental ones.