加载对拓结构介质的高增益Vivaldi天线

A design of high-gain Vivaldi antenna based on antipodal structural dielectric loading

Vivaldi天线属于渐变缝隙天线的一种,被广泛应用于平面超宽带天线设计中.Vivaldi天线在理论上可以展宽带宽到无限大,但受限于加工工艺和尺寸,其增益提高效果并不明显.文中立足于经典Vivaldi天线,在天线辐射前端加载对拓结构的介质,仿真结果表明相对带宽扩展了79.1%,在5.5GHz与12GHz处提高增益达3dBi.过孔矫正技术可以使天线辐射的相位分布更加均匀,提高幅度分布的口径效率.在对拓结构基础上,天线辐射端加载相位矫正的过孔阵列结构,仿真结果表明加载该技术后,天线提高增益2dBi以上.包含以上两种技术的天线结构具有高增益、便于设计、小型化的特点,这为端射天线提高增益和增强定向性提供了新的思路.

Vivaldi antenna,a kind of tapered slot antenna,is widely used in the design of planar ultra wideband antennas.Vivaldi antennas can broaden the bandwidth infinitely in theory,but the improvement of the gain is not prominent because of the processing technology and the dimension.This paper loads the antipodal structural dielectric on the front of the radiation structure.The results indicate that the relative bandwidth broadens by 79.1% and the gain increases 3 dBi at 5.5 GHz and 12 GHz.The technology of slotting correction makes the radiation phrase distribution more symmetrical,thus enhancs the efficiency of the amplitude distribution.The results indicate that the gain increases 2 dBi through loading the technology.Both technologies in the design own the merits of high gain,simple design and miniaturization,which provides a new idea for end-fire antenna gain and directivity improvement.