K波段平顶波束赋形反射面天线设计

Design of a K-band Flat-top Contoured-Beam Reflector Antenna

摘要:

为了获得照射均匀的平顶波束，使用反射面赋形的方法，设计了一款工作在19~22 GHz的单偏置反射面天线. 结合Zernike多项式展开法与遗传算法优化反射面形面，采用天线远场照射面特定区域照射电平差值作为目标函数以实现平顶波束. 仿真结果表明，赋形后天线方位面方向图在±8°范围内，照射电平波动小于0.6 dB，电平幅度大于20 dBi.

Abstract:

In order to obtain the flat-top beam, an offset reflector antenna that works at 19 GHz-22 GHz is designed using reflector shaping method. Using Zernike polynomial expansion method and the genetic algorithm to optimize reflector shape. The difference between actual and ideal value of the irradiation intensity of a specific area on the far-field radiation surface of the antenna is selected as the objective function to achieve flat-top beam. The simulation results show that irradiation intensity ripple of the antenna is less than 0.6dB and the amplitude is greater than 20.5 dBi within ±8° in the azimuth pattern.