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针对传统方法设计的多波束反射阵天线增益低、波束偏移大、要求波束对称等问题,通过引入全局优化算法中的遗传算法对反射阵相位分布进行优化,以完成非对称多波束反射阵天线设计。为验证其有效性,设计并制作了一副Ku频段,波束指向分别为θ1=25°,1=0°和θ2=15°,2=180°的非对称双波束反射阵天线。测试和仿真结果较吻合,天线在中心频点的增益为26.03dBi,效率达到28.04%,1dB增益带宽和3dB轴比带宽均能覆盖11.3~12.3GHz(8.3%),实测波束指向为θ1=24.3°,1=0°和θ2=15°,2=180°,波束偏移0.7°。结果表明遗传算法能有效完成非对称多波束反射阵天线设计。
Aiming at the problems of low gain, large beam offset and beam symmetry required by the traditional method, the phase distribution of the reflection array is optimized by introducing the genetic algorithm in the global optimization algorithm to complete the asymmetric multi-beam reflection array antenna design. In order to verify its effectiveness, a pair of asymmetric dual-beam reflected array antennas with Ku band and beam directions of θ1 = 25 °, 1 = 0 ° and θ2 = 15 ° and 2 = 180 ° are designed and fabricated. The experimental results show that the antenna has a gain of 26.03dBi at center frequency and an efficiency of 28.04%. The 1dB gain bandwidth and the 3dB axis bandwidth both cover 11.3 ~ 12.3GHz (8.3%). The measured beam directivity is θ1 = 24.3 °, 1 = 0 ° and θ2 = 15 °, 2 = 180 °, and beam offset 0.7 °. The results show that genetic algorithm can effectively accomplish the design of asymmetric multi-beam reflected array antenna.