加载电磁带隙结构的阶梯型微带天线设计及分析

摘要

In order to reduce the high temperature damage caused by atmospheric friction,aircraft radar antenna will gener-ally be equipped with radome or dielectric window.In this paper,the bandgap characteristic of the electromagnetic bandgap (EBG)structure and the bandwidth and the good matching characteristics of the ladder-type microstrip antenna are combined to design an EBG structure ladder-type microstrip antenna with dielectric window,and then the antenna radiation characteristics and the effect of dielectric window on them are calculated and analyzed.The results show that the bandgap produced by the EBG structure can restrict the propagation of the surface wave of the antenna and improve the bandwidth and gain performance of the antenna.The structure can also reduce the mutual coupling effect between the antenna and the dielectric window,which can pro-vide a theoretical reference for the design and application of the EBG structure ladder-type microstrip antenna with dielectric win-dow.%为了减弱大气摩擦引起的高温损伤,航空飞行器雷达天线一般都会加装天线罩或介质窗,将电磁带隙(EBG)结构的禁带特性和阶梯型微带天线的带宽及良好的匹配特性相结合,设计了一种含介质窗的EBG结构阶梯型微带天线,并计算分析了天线的辐射特性及介质窗对辐射特性的影响.结果表明:EBG结构产生的带隙能够制约天线表面波的传播,改善天线的带宽和增益性能,且当介质窗存在时,该结构亦可降低天线与介质窗间的互耦效应.这为含介质窗的 EBG结构阶梯型微带天线的设计和应用提供了一定理论参考.