中波广播天线近场区电磁辐射场强的空间分布测算

The Calculation of Spatial Distribution of Electromagnetic Radiation Field Strength in the Near-Field of Medium WaveBroadcasting Antenna

中波广播主要应用垂直极化波沿地面进行传播,其天线近场区电磁辐射空间分布较为复杂,会影响中波广播信号的传输距离和覆盖区域。基于此,利用参数估计算法计算天线近场区电磁辐射场强进行计算和分析,以形成对电磁辐射场强空间分布的数值型具象描绘。测算结果表明,中波天线的辐射功率、中波信号波长均会对天线近场区电磁辐射场强的空间分布产生不同程度的影响,为相关天线辐射功率研究提供参考。

Medium wave broadcasting mainly uses vertically polarized waves to propagate along the ground.The spatial distribution of electromagnetic radiation in the near-field area of the antenna is complicated,which will affect the transmission distance and coverage area of medium wave broadcasting signal.Based on this,the electromagnetic radiation field intensity in the near-field area of the antenna is calculated and analyzed by parameter estimation algorithm to form a numerical representation of the spatial distribution of electromagnetic radiation field intensity.The results show that the radiation power of medium wave antenna and the wavelength of medium wave signal will have different degrees of influence on the spatial distribution of electromagnetic radiation field intensity in the near-field area of antenna,which provides a reference for the research of relevant antennaradiationpower.