高速运动状态下天线基本振子的辐射场研究

Research on radiation field of short antenna dipole under high-speed motion

在研究人们处于飞机、高铁等高速载人工具中的通信问题时,研究构成天线的基本成分——基本振子在高速运动下的辐射特性具有重要的意义。本文在静态基本振子辐射场的基础上通过洛伦兹变换推导出其在高速运动状态下的辐射场和两种状态下的能流密度矢量。根据静态和高速运动状态下基本振子的辐射场表达式以及能流密度矢量推导出其场强方向性函数和功率方向性函数,并用MATLAB进行仿真分析。由分析可知高速运动状态下基本振子的辐射场主要被洛伦兹变换所带来的高速分量影响;若因角度变化导致分量中包含光速的单项式丢失,则分量的辐射场几乎为零,为未来高速载人工具中天线的定向辐射和天线布阵奠定了理论基础。

When studying the communication problems and people in high-speed manned vehicles such as airplanes and high-speed rails,it is of great significance to study the the radiation characteristics of the basic oscillators under high-speed motion which are the basic components of the antennas. Based on the static short dipole radiation field,the radiation field under high-speed motion and the energy density vector in two states are derived by Lorentz transformation. The radiation field expression of the short dipole is based on static and high-speed motion. And the energy density vector derives its field strength directivity function and power directivity function and simulated by MATLAB. It can be seen from the analysis that the high-frequency component of the radiated field of the short dipole is mainly caused by Lorentz transformation under high-speed motion. If the monomial containing the speed of light in the component is lost due to the angle change,the radiated field of the component is almost zero. It lays a theoretical foundation for the directional radiation and array of high-speed mobile antennas in the future.