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研究一种超宽带TEM喇叭天线。提出一种无需加载的超宽带TEM喇叭天线的设计思路,理论推导该天线的远区场,由此得到特性阻抗变化与反射系数的关系。利用电磁仿真软件Ansoft HFSS模拟分析,在此基础上,设计一种视轴长度10cm的此类型TEM喇叭天线。测量得到在100～550MHz天线驻波比小于2.0,结果表明此天线在不加载情况下,通过对其结构进行合理的弯曲设计,也能使其具有良好超宽带特性。
Study of an ultra-wideband TEM horn antenna. A design idea of UWB TEM horn antenna without loading is proposed. The far field of the antenna is derived theoretically, and the relationship between the characteristic impedance and the reflection coefficient is obtained. Using electromagnetic simulation software Ansoft HFSS simulation analysis, based on this, we design a TEM horn antenna of this type with a visual axis length of 10 cm. The measured results show that the antenna standing-wave ratio is less than 2.0 at 100 ~ 550MHz. The results show that this antenna can have good ultra-wideband (UWB) characteristics by reasonable bending design of the antenna without loading.