一种提高全向水平极化天线带宽的设计

Design of improving the bandwidth of the omnidirectional horizontally polarized antenna

设计了一种新型带微扰的宽带全向水平极化天线,通过天线正面的弧形偶极子的阶梯状边缘和背面的正方形微扰提升天线带宽。利用CST仿真得到最优的参数解,并制作实物进一步验证天线带宽。四对弧形偶极子组成一个圆环,每对弧形偶极子对应一个方向,并通过宽带巴伦均匀同相馈电,模拟载有均匀同相电流的圆环以实现全向水平极化。天线相对带宽50%(1.71~2.85GHz),并且在1.71~2.55GHz间拥有较高增益(2~4dBi)。该天线结构简单、紧凑、低剖面,特别适合于室内基站建设。

A novel wide band omnidirectional horizontally polarized antenna is proposed and its bandwidth has been improved by introducing perturbations which consist of the ladde-like edges of the arc microstrip dipole arms and the square-shaped copper sheets. Using CST to simulate optimal solutions, and fabricatingthe proposed antenna to validate the bandwidth. The four pairs of the arc microstrip dipolesform a ringin four directions. Wideband baluns are used to feed uniform and in-phase current. Which is used to simulate uniform and in-phase current circle to achieve omnidirectional horizontally polarization. The relative bandwidth of the proposed antenna is 50 % （1.71 - 2.85 GHz）. The proposed antenna demonstrates a high gain（2-4 dBi） at 1.71-2.55 GHz. It is small, compact and lowprofile and especially suitable for application indoorbase stations.