基于左手传输线的双线极化微带阵列天线

Dual-linearly-polarized microstrip array based on left-handed transmission line

基于左手传输线,提出了一种新型串联馈电的双线极化微带阵列天线结构。通过上层微带线边馈和下层小孔耦合馈电的方式分别实现了天线单元的垂直极化和水平极化的激励,进而使得该天线单元具有高极化隔离度、低交叉极化和宽频带工作等优点。同时由于左手材料具有相位超前的特性,利用传统的右手微带传输线和左手微带传输线的组合以达到零相位延迟,实现了对上述单元构成的微带阵列天线的串联馈电。相对于传统微带阵列天线,该阵列天线结构简单、面积小、插入损耗小、阵列效率高、易于扩展成更大的平面阵列。

Based on Left-handed transmission line （LH-TL）, a novel dual-linearly- polarized microstrip array with series feeding configuration is presented. Because excitations of vertical and horizontal polarization of the antenna element are implemented by means of upper microstrip side-feeding and lower aperture-coupled feeding, respectively, the element is of high isolation, low cross-polarization and broad bandwidth characteristics. With ahead phase shift characteristics of LH-TL in mind, a microstrip array with composite right/left-handed transmission line as feed line is presented, which can remove the insertion phase shift. Compared with the traditional microstrip array, the novel microstrip array shows many advantages, such as simple in structure, small in area, low insertion loss and high efficiency.