新型定向超宽带天线

基于圆片单极天线是一种结构简单的超宽带天线,研究了一种新型的超宽带天线,它将4个圆片单极天线垂直交叉放置作为馈源并采用平板反射面,实现定向以及双极化或圆极化特性。分析了2种变形形式:将平板反射器换为抛物面反射器,实现高增益特性;将圆片振子变形,实现更宽的低频端阻抗带宽。通过电磁仿真软件,计算了天线的S参量和辐射方向图随频率的变化规律。分析表明文中的天线对于传统的圆片单极天线有了有效的改进,实现了超宽带、定向辐射、双极化、圆极化、高增益等不同的特性,它们在卫星通信和移动通信中具有良好的应用前景。

Tw0 N0vel Directional Ultra Wide-band Antennas

The circular monopole antenna is a kind of ultra wide-band antennas with simple structure.Firstly a novel ultra wide-band antenna was studied.Four circular disc monopoles were placed across each other.They were considered as the feeds,and the reflection plane is planar.It could achieve directional radiation,dual polarization or circular polarization characteristics.On this basis,further study was carried out for two other novel antennas.The first one is changing the planar reflector to parabolic one,and the purpose was to realize high gain characteristic.The other one is changing the circular disc shape,and the purpose was to realize wider lower band.The novel antennas were theoretically analyzed,and the S-parameter and radiation patterns of the antennas were calculated with electromagnetism simulation software.The analytical results verify that the characteristics of the traditional monopole antenna is effectively improved by the novel antennas.Ultra wide-band,directed radiation,dual-polarization,circular polarization,and high gain characteristics of the antenna are realized.The novel antennas are suitable for satellite and mobile communication systems with good prospects.