加载电阻和开不等矩形槽的Vivaldi天线

本文提出了一种新型的指数型渐变槽线天线(即Vivaldi天线或ETSA,Exponential Tapered Slot Antenna)。在传统Vivaldi天线的基础上,对两个地方进行改进：一是在天线的指数槽底部加载电阻,二是在天线辐射区开对称的三个不等矩形槽。主要目的是改进天线的低频段性能。该加载电阻的开槽Vivaldi天线的尺寸为150mm*150mm,采用的介质基板是介电常数4.4,损耗正切0.02的玻璃纤维环氧树脂板(即FR-4板)。运用Ansoft HFSS14电磁仿真软件对结构进行优化分析,设计并制作了一款工作在0.8-3.8GHz(实测)的改进型Vivaldi天线。该天线在带宽范围内具有良好的定向辐射特性。

Resistive Loaded and Unequal rectangular SlottedVivaldi Antenna

In this paper, a novel exponential tapered slot antenna (Vivaldi antenna OR ETSA) is proposed. On the basis of traditional Vivaldi antenna, the two parts are improved: one is the load resistance at the bottom of the antenna"s exponential tapered slot, and the other is the three rectangular slots in each radiation area of the antenna. The main objective is to improve the low frequency performance of the antenna. The size of the resistive loaded slotted Vivaldi antenna is 150mm(length)*150mm(width),and the dielectric substrate is glass fiber epoxy resin board (FR-4 board),whose dielectric constant is 4.4 and loss tangent is 0.02. We use HFSS14 Ansoft electromagnetic simulation software to optimize the structure,and then fabricate a improved Vivaldi antenna,which works in the 0.8-3.8GHz (measured). The antenna has good directional radiation characteristics in the bandwidth range.