新型宽波束圆极化UHF终端监测天线设计

Design of A novel wide beam and circularly polarized monitor antenna in UHF band

本文设计了一种UHF频段宽波束圆极化天线。天线辐射振子为十字交叉阵子形式且采用同轴馈电方式,反射器也采用十字振子取代常用的金属板。这样既可以提高天线增益,又可以有效地降低风载利于实际工程应用。软件仿真结果表明,该天线在工作频带内电压驻波比小于2.0,增益大于5.0dB,具有120°以上的方向图波瓣宽度并且圆极化特性良好。同时,该天线具有小型化、轻型化和低成本的优点,其可以作为高速公路收费系统的终端监测天线。

A novel UHF band wide beam and circularly polarized antenna is presented in this paper.The radiation element is based on cross dipole,and backed with a cross reflector to achieve a high gain uni-directional pattern.The proposed antenna is successfully simulated.The simulated results show that for the designed antenna the VSWR is less than 2.0,the gain is greater than 5.0 dB,and the antenna displays more than 120°beamwidth and excellent circularly polarized characteristics.In addition,the antenna exhibits the merits of compact,lightweight and low cost,which is very suitable for the terminal monitor antenna of the thruway charge system.