具有局部凸起形变反射面天线的方向图仿真

Radiation Pattern Simulation of the Offset Reflector Antennas with Local Protuberant Distortion

针对反射面天线受撞击表面形变问题,利用二次曲面交截椭圆建立局部凸起形变的数学模型,运用基于表面电流积分的物理光学方法计算辐射方向图,研究了天线发生形变后辐射特性随形变面积和形变位置的变化规律。结果表明,随着形变面积的扩大,副瓣电平逐渐升高;形变位于中心位置时,对方向图的影响最为显著。

The computational mathematic model, which is a kind of local protuberant distorted offset reflector antenna, is established considering reflector antennas impacted. The local distorted model is described making use of elliptical section generated by quadric intersection,and the radiation patterns are obtained using the method of Physical Optics （PO） based on surface current integration. The infection of protuberant distorted radiation patterns is discussed as the distorted area and distorted position are changed, As a result,the larger the area and the closer the position of the protuberant distortion to the reflector center,the higher will be position of the sidelobe level.