CAJ | 학술논문

本文提出了一种新的边界条件：驻波-行波边界条件(STWBC).这种边界条件是在计算域外附加理想导电（磁）壁进行截断，运用反射原理，将边界处的驻波转化为行波，保持计算域内的行波状态，在有限空间内有效模拟出无限大的电磁散射空间.文中给出了该边界条件在FDTD中的差分迭代式，以及二维数值实验结果，并与PML边界和单向波边界进行了比较.由于该边界比单向波边界所需计算空间小，数值稳定性好，同时不象PML边界，需要进行场量分离和附加额外的吸收层，因此计算效率较高.
본문제출료일충신적변계조건：주파-행파변계조건(STWBC).저충변계조건시재계산역외부가이상도전（자）벽진행절단，운용반사원리，장변계처적주파전화위행파，보지계산역내적행파상태，재유한공간내유효모의출무한대적전자산사공간.문중급출료해변계조건재FDTD중적차분질대식，이급이유수치실험결과，병여PML변계화단향파변계진행료비교.유우해변계비단향파변계소수계산공간소，수치은정성호，동시불상PML변계，수요진행장량분리화부가액외적흡수층，인차계산효솔교고.
In this paper,Standing-Traveling Wave Boundary Condition (STWBC) is developed to truncate the computational domain without reflection.The perfect electric conducting (PEC) termination is used,and unlike the PML,no additional absorbing region surrounding the domain of interest is needed.With STWBC,the standing wave on the boundary is transformed to the traveling wave,and creates no reflections.Numerical examples demonstrate that the FDTD implementation of the STWBC technique is stable,and independent of the incident angle of the outwardly traveling wave.As compared to PML,it allows us to obtain a little lower accuracy but a great release of computational requirements.Thus it is more computationally efficient for a big target.