摘要
本文利用遗传算法对不等间距阵列天线进行优化 ,实现了一种赋形波束基站天线。天线模型用矩量法分析 ,并采用遗传算法综合天线方向图 .在优化过程中通过合适的目标函数 ,保证了天线较好的频段特性 ,并压制干扰区副瓣、填充服务区零值、控制后瓣。优化后天线在整个工作频段上实际性能为 :上副瓣小于 - 18.32dB ,填充零点大于 - 14 .71dB ,前后比小于 - 2 6dB .与以前的方法相比 ,本文的结果更接近实际情况 ,并且该方法可应用于较复杂的天线 .
A shaped beam base station antenna is realized with the unequal spacing array using an optimization technique based on genetic algorithms. Antenna model is evaluated by using the Method of Moment (MoM). During the antenna optimization process, an appropriate fitness function is used to suppress the sidelobe in interference zone, fill the null points in service zone and control the back lobe, to get satisfactory pattern shape in the whole frequency band. As a result of this optimization, a practical shaped beam antenna with suppressed sidelobe smaller than-18.32 dB and backlobe-26 dB, filled null point larger than-14.71 dB is achieved. The proposed method is closer to reality compared with previous methods and can be used to optimize complicated antennas. The result is very useful for engineering and theoretic analysis.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2003年第9期1310-1312,共3页
Acta Electronica Sinica
基金
国家自然科学基金 (No .69971 0 1 7)
西安海天天线股份有限公司资助
