基于VHF频段的弯折面顶加载天线设计

摘要

A top⁃loaded antenna structure with meander surfaces in VHF band is designed,which can not only improve the termi⁃nal match performance of monopole airborne antenna,but also meet the miniaturization requirements.The structure of the antenna model is constructed by using the top⁃loaded technology and the meander line theory.And the electric performance of the antenna is analyzed by genetic algorithm and numerical optimization.The simulation and test results show that the antenna has a good radiation performance and is well matched with a 86�5% relative impedance bandwidth,with S11≤-10 dB,in the band of 105~265 MHz. It can provide a correlative theoretical basis for the engineering design.%为了提高机载单极子天线的终端匹配性能，实现天线的小型化，设计了一种VHF频段顶加载与弯折面式的机载刀型天线。采用顶载技术与弯折线理论构建天线结构模型，并且运用遗传算法和数值优化等方法对天线电性能进行分析。仿真分析与实物测试结果表明，在105～265 MHz频段范围内满足S11≤10 dB，达到相对带宽86�5％，为工程设计提供了良好的理论依据。