考虑互耦的阵列天线辐射近场近似计算方法

针对大规模阵列天线辐射近场电磁兼容性问题,基于有源单元方向图原理和子阵信息的综合方法计算了大规模阵列天线辐射近场场强的分布。该方法采用等效技术获取大规模阵列天线的端口特性,进一步结合天线单元的远场数据综合分析得到大规模阵列天线的近场分布;计算结果表明,在满足天线单元辐射远场条件下,该方法能够准确计算出大规模阵列天线的辐射近场分布。相较于全波分析,本方法在保证精度的同时,提高了计算效率,并且具有良好的灵活性。通过全波分析的数值算例验证了该方法的正确性。

An Approximation Method for Calculating the Near Field Radiation of Large Finite Antenna Arrays Including Mutual Coupling Effects

A novel method combined of active element pattern concept and small array information is developed to calculate the near field radiation of large finite antenna arrays, for the investigation of electromagnetic compatibility of the platform. First, the terminal information of subarray elements are employed to deduce those of large finite antenna arrays, then the near field characteristics are analyzed by combining the far field radiation of an isolated antenna element. The results of horn antenna arrays show that this method could accurately predict the near field distribution, provided that the far field condition of a single element is fulfilled. This method is considered highly efficient and flexible as well as accurate, which is validated by the results of full wave simulations.