表面误差对反射面天线电性能的影响

 针对反射面天线存在的误差问题,建立了包含系统误差和随机误差对电性能影响的数学模型.该模型根据表面误差与口径面相位分布的关系,利用口径法得到功率方向图.通过对模型分析可知,随机误差对方向图各个方位产生影响;系统误差产生栅瓣,且栅瓣的位置和电平取决于变形情况.最后将模型应用到8米口径的抛物面天线中,收到了满意的结果,验证了文中模型和方法的正确性.

The Effect of Surface Error on Reflector Antenna Performance

To study the effect of the surface errors on reflector antenna performance,a computational model including systematic distortions and random errors was presented.In the model,power pattern was given by the aperture-field method according to the relation between surface errors and the phase distribution of aperture plane.Then power patterns were simulated and it is shown that random errors work in every azimuth angles and systematic distortions generate grating lobes in a few angles,the location and level of...