CAJ | 학술논문

采用移位算子方法把时域有限差分法推广应用于二维磁各向异性色散介质-磁化铁氧体中.证明了电磁波横向入射二维轴向磁化铁氧体目标情形下,电磁波可按目标的轴向分解为横电波(TE波)和横磁波(TM波),且TE波的散射特性与铁氧体介质无关,而TM波的散射特性与介质电磁参量密切相关,同时对其物理原因进行了分析.通过采用移位算子方法处理磁化铁氧体频域本构关系,得到该情形下目标电磁散射的移位算子时域有限差的迭代计算公式,同时解决了电磁波在各向异性和频率色散介质中传播的问题.计算了轴向磁化铁氧体涂敷Von Karman型导体柱的TM波双站雷达散射截面,分析了铁氧体参量对目标双站雷达散射截面的影响.结果表明:恰当地选择铁氧体参量能有效地减少目标的雷达散射截面,本文时谐因子取exp jωt.
채용이위산자방법파시역유한차분법추엄응용우이유자각향이성색산개질-자화철양체중.증명료전자파횡향입사이유축향자화철양체목표정형하,전자파가안목표적축향분해위횡전파(TE파)화횡자파(TM파),차TE파적산사특성여철양체개질무관,이TM파적산사특성여개질전자삼량밀절상관,동시대기물리원인진행료분석.통과채용이위산자방법처리자화철양체빈역본구관계,득도해정형하목표전자산사적이위산자시역유한차적질대계산공식,동시해결료전자파재각향이성화빈솔색산개질중전파적문제.계산료축향자화철양체도부Von Karman형도체주적TM파쌍참뢰체산사절면,분석료철양체삼량대목표쌍참뢰체산사절면적영향.결과표명:흡당지선택철양체삼량능유효지감소목표적뢰체산사절면,본문시해인자취exp jωt.
The finite-difference time-domain(FDTD) method is extended to two-dimensional magnetic anisotropic dispersive media-magnetized ferrite by using Shift Operator(SO).It is proved that when the incident plane wave vector is perpendicular to the axis of the two-dimensional axial magnetized ferrite cylinder,the electromagnetic wave can be decomposed into Transverse Electric(TE) and Transverse Magnetic(TM) waves.The electromagnetic scattering characters of TE wave have no relation with the target,but the electromagnetic scattering characters of TM wave have close relations with the electromagnetic parameters in magnetized ferrite.The physical reasons are analyzed.The FDTD with shift operator(SO-FDTD) formulations in this case are derived based on the constitutive relation for magnetized ferrite and shift operator,which leads to the electromagnetic wave propagation of both anisotropy and frequency dispersion media being solved at the same time.For the electromagnetic scattering of Von Karman shaped conducting cylinder coated with anisotropic magnetized ferrite,the effect of the ferrite parameters on the bistatic Radar Cross Section(RCS) is investigated and some numerical results are obtained.The results indicate that an appropriate ferrite coating may efficiently reduce the RCS of a metallic target,and exp (jωt) denotes the convention of time dependence.