新颖的宽带高增益车载全向天线

一种新颖的宽带高增益车载全向天线

内容简介：介绍了一种工作在225～800MHz的双锥柱形超宽带垂直极化全向天线结构。在两天线单元之间加同轴电缆扼流圈替代传统的0．25A0扼流杯，并在天线底部加同轴电缆扼流圈和用Г匹配方式给两天线单元馈电的方法，完成了一种具有4个倍频程的超宽带垂直极化全向天线。该天线具有良好的匹配性能和辐射特性，有效的克服了一般超宽带全向天线垂直面辐射方向图主波瓣容易偏离水平面的不足。

Abstract：A new structure for an ultra-broadband vertically polarized omnidirectional antenna is proposed for operation in the frequency range 225 -800 MHz. The new antenna element has a center-fed cylindri- cal configuration with a bicone at the feeding point. For a two-element antenna array, a coaxial-cable choke is adopted between two antenna elements, instead of using a traditional A0/4 choke. An additional coaxial-cable choke is employed in the bottom of the antenna array with each element fed with a F- matched unit. An ultra-broadband vertically polarized omni-directional antenna with a 4 ： 1 bandwidth is obtained. This antenna has the advantages of good impedance matching and desirable radiation patterns that effectively avoid the mainlobe shifting from the horizontal plane as happened for a traditional ultra- broadband vertically polarized omni-directional antenna.

作者：吴荣远, 黄武装,

关键词：宽频带, 垂直极化, 车栽, 全向天线,