有限元方法设计赋形波束缝隙面阵馈电网络

Feed Network Design of Shaped Beam Slotted Array by Finite Element Method

采用缝隙倾角变化实现幅度加权 ,采用等高但不等宽的波导实现相位加权 ,并设计了过渡段以减少反射 ,可以对赋形波束方向图面阵实现所需要的馈电 .为了获得需要的幅度和相位 ,用有限元方法对缝隙单元尺寸、幅度激励和移相网络进行了数值仿真 .通过调整几何尺寸来实现所需要的幅度与相位要求及阻抗匹配 .最后给出了 1个缝隙阵列天线的设计实例 。

Changing the angles of the centered inclined slots was used to design the array feed's amplitude distribution. Changing the widths and lengths of the waveguides was used to design the array feed's phase distribution. A new design method of the feed network of shaped beam slotted array by finite element method was presented. In order to obtain the amplitudes and phases needed, the feed slot sizes, the feed excitation amplitudes and the phase network were calculated by finite element method. An example of design indicates the theoretical and experimental results are consistent well in the main shaped beam.