提出了一种新颖的宽频带双极化方形偶极子基站天线单元,该天线单元由圆柱形支撑座、方形偶极子单元、改进的双倒L型馈电线以及反射板组成。仿真和测试结果显示,在1.69 GHz~3.16 GHz 频段内,两个端口处的电压驻波比(VSWR)均小于1.5,其中,在所需要的工作频段1.71 GHz~2.69 GHz 内,两端口的VSWR均小于1.4,隔离度小于-30 dB,交叉极化比均小于-29 dB,最大增益为10.6 dB,在整个宽频带内具有较为稳定的方向图和增益。同时,该天线经过改进后重量轻,馈线可调性好,安装简单易实现。

A novel broadband dual-polarized square dipole base-station antenna is presented in this paper. The antenna is composed of cylindrical supported structure, modified double inverted-L feed strips, quadratic dipoles and baffle-board. The antenna achieved a common impedance bandwidth of 1.69 GHz~3.16 GHz (VSWR<1.5) and 1.71 GHz~2.69 GHz (VSWR<1.4) at both input ports. In 1.71 GHz~2.69 GHz, it has good performance in isolation which is more than -30 dB between the two input ports. The cross-polarization of the antenna is better than -29 dB and the maximum gain is about 10.6 dBi. The radiation pattern and the gain in the operating frequency band are stable. The improved antenna is light and the feed strips are adjustability meanwhile.

广东省自然科学基金资助项目