基于FDTD的天线远场快速算法

Fast Algorithm of Antenna Far Field in FDTD

将FDTD法与二维离散余弦变换(2D-DCT)递归算法相结合计算天线远场,大幅提高了计算效率并降低了计算存储空间。采用2D-DCT递归算法对近场数据进行压缩,得到失真度较小的重构场,并用该重构场计算天线远场,数值仿真角反射器天线所得到的结果与实验测量结果吻合良好,说明该方法的有效性。

An efficient method of computing the antenna far field was introduced, which used the finite difference time domain （FDTD） method combining a recursion algorithm of two dimension discrete cosine transform （2D-DCT） . This method improved computing efficiency greatly and saved memory. The corner reflector antenna was calculated using FDTD. A reconstructed near field calculated by 2D-DCT shows little distortion. The far fields received from reconstructed near fields agree with the experimental measuring results.