CAJ | 학술논문

应用分裂平面波时域有限差分（Splitting Plane wave Finite Difference Time Domain ，SP-FDTD ）方法到三维时域有限差分（Finite Difference Time Domain ，DFDTD ）中引入高效平面波源。该方法基于分裂场思想，在一维FDTD上构造了新的迭代公式，使得一维FDTD和三维FDTD离散网格之间的数值相速度一致，消除了由于相速不一致而在总场区引起的泄漏误差以及插值带来的数值误差。通过数值算例验证了SP-FDTD方法对不同波源在任意角度（斜入射）下的平面波入射都是有效的，且泄露误差均在-300dB水平。
응용분렬평면파시역유한차분（Splitting Plane wave Finite Difference Time Domain ，SP-FDTD ）방법도삼유시역유한차분（Finite Difference Time Domain ，DFDTD ）중인입고효평면파원。해방법기우분렬장사상，재일유FDTD상구조료신적질대공식，사득일유FDTD화삼유FDTD리산망격지간적수치상속도일치，소제료유우상속불일치이재총장구인기적설루오차이급삽치대래적수치오차。통과수치산례험증료SP-FDTD방법대불동파원재임의각도（사입사）하적평면파입사도시유효적，차설로오차균재-300dB수평。
The method of SP-FDTD (Splitting Plane wave Finite Difference Time Domain )is applied to 3D FDTD (Finite Difference Time Domain )method for plane wave incidence .Based on the split-field formulation ,the method has the new iterative e-quations and can eliminate the error of interpolation and discretized phase velocity mismatch between 1D FDTD and 3D FDTD grid . Numerical results show that the present method is valid for different type of wave sources ,and accuracy for oblique incident plane wave ,with the leakage error on the order of -300dB .