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改进了 FDTD中基于 Kirchhoff积分的近远场变换。它的优点在于实现简单 ,计算某一远场分量只用到与之相同的近场分量 ,既能计算远场又能计算近场 ,可以大大缩减 FDTD计算空间。同时将每一时间步的近场对远区的贡献分别计算 ,避免了存储积分面上上一时间步近场值的内存开销 ,近远场变换得到了进一步简化。计算结果表明 ,这种变换方法非常准确。
Improved near-far field transform based on Kirchhoff integral in FDTD. The advantage of this method is that it is simple to implement. Calculating a far-field component uses only the same near-field component, so far both the far field and the near field can be calculated, and the FDTD calculation space can be greatly reduced. At the same time, the contributions of the near-field to the far-field of each time step are calculated separately, which avoids the memory overhead of storing the near field value of the last time step on the integral surface, and the near-far field transformation is further simplified. The calculation results show that this method of transformation is very accurate.