设计了一种采用切比雪夫渐变线的TEM喇叭天线,分析了其工作原理,采用数值模拟的方法研究了其阻抗特性、传输特性与辐射特性,并在不同的馈入脉冲下与常用的线性渐变TEM喇叭天线进行了性能对比。结果表明: 切比雪夫渐变线TEM喇叭天线具有低反射、高带宽和高辐射场强的优点,其性能要明显优于线性渐变TEM喇叭天线,且馈入脉冲越宽,性能越明显。分析了最大反射系数对切比雪夫渐变线TEM喇叭天线辐射性能的影响,馈入脉冲越窄时,宜选择反射系数越大的辐射天线。

An Chebyshev tapered transmission line TEM horn antenna is designed, and the working principle, impedance characteristics, transmission characteristics and radiation characteristics are studied based on numerical simulation. Compared to conventional linear TEM horn antenna, the Chebyshev tapered transmission line TEM horn antenna has lower reflection, wider band and higher radiation efficiency. The wider the input pulse is, the better performance the antenna has. The effect of maximal reflection coefficient on radiation performance of antenna is analysed. The results show that if the input pulse is narrow, we should select the larger reflection coefficient antenna.