摘要
根据磁化铁氧体材料的磁场强度和磁感应强度之间色散的本构关系式,利用时间微分算子/t和jω的时域和频域对应关系,将磁化铁氧体材料频域的本构关系转化为时域的本构关系,然后将时间微分算子/t在时域采用直接离散的方式,得到磁场强度和磁感应强度的时域有限差分迭代式.数值结果表明,该方法易于实现,简单可行,并节约内存.
Based on the constitutive relation between the magnetic permeability and magnetic flux density, the constitutive relation of magnetized ferrite medium in frequency domain is transformed to the time domain by using the corresponding relation between the time-differential operator δ/δt and jω. And the constitutive relation including the time-differential operator δ/δt in time domain is presented. By the introduction of a direct-discrete method, the time-differential operator δ/δt is dispersed. Then direct discrete-finite-difference time-domain（DD-FDTD） iterative formula are derived in the discrete time domain. To exemplify the availability of the algorithm, the backscattering radar scattering section of a magnetized ferrite sphere is computed, and the numerical results are the same as the reference values, and show that the DD-FDTD method is correct and efficient.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第5期2936-2940,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:40674060)
江苏大学高级专业人才科研启动基金(批准号:07JDG063)资助的课题~~
关键词
电磁散射
磁化铁氧体
时域有限差分方法
直接离散方法
electromagnetic scattering, magnetized ferrite, finite-difference time-domain method, direct-discrete method
