传输线矩阵(Transmission line matrix,以下简称TLM)方法,根据场方程和传输线方程之间的相似性,用等效分布传输线网络模拟给定结构,在时间和空间上进行离散化,是一种强有力的三维时域电磁场数值仿真算法。简要介绍三维扩展型结点TLM方...传输线矩阵(Transmission line matrix,以下简称TLM)方法,根据场方程和传输线方程之间的相似性,用等效分布传输线网络模拟给定结构,在时间和空间上进行离散化,是一种强有力的三维时域电磁场数值仿真算法。简要介绍三维扩展型结点TLM方法的模型、激励源和边界条件,并使用该方法对亚波长结构的抗反射特性进行模拟研究,为进一步深入探讨该结构的抗反射特性、进行优化设计提供依据。展开更多
Several technical problems of numerical method in TLM procedures arediscussed.The bandwidth of single mode in four kinds of dielectric slab loaded rect-angular waveguides is investigated,and the optimum bandwidth whic...Several technical problems of numerical method in TLM procedures arediscussed.The bandwidth of single mode in four kinds of dielectric slab loaded rect-angular waveguides is investigated,and the optimum bandwidth which is related tothe dimensions and dielectric constants is obtained.These results are useful to the de-sign of dielectric slab loaded rectangular waveguide.展开更多
In this paper,a lumped RC circuit model,which is based on the Transmission Line Modeling(TLM)method,is used to describe the space charge production and displacement mechanisms in three different solid dielectric mater...In this paper,a lumped RC circuit model,which is based on the Transmission Line Modeling(TLM)method,is used to describe the space charge production and displacement mechanisms in three different solid dielectric materials(LDPE,PTFE and FR4).Each dielectric material is considered as a transmission line with the capacitive and resistance elements.The obtained circuit equations are solved along with the continuity equations for the various charged species in the bulk of solid dielectric material.The electric potential and field,density of different charged species and their recombination rates,resistive and capacitive properties of the solid dielectric material are calculated.In addition,the effects of the variations in the applied voltage,dielectric permittivity and temperature on these physical parameters are examined.Besides,compared with LDPE and PTFE,the net charge density increment rate in FR4 is much higher.Moreover,the influences of temperature on the net charge density in LDPE are not significant.Furthermore,at the higher applied voltages,the current density is increased.Interestingly,the effects of temperature variations on the recombination rates,net charge and current density in LDPE are much lower.Hence,the suitability of LDPE as solid dielectric material is proved.展开更多
文摘传输线矩阵(Transmission line matrix,以下简称TLM)方法,根据场方程和传输线方程之间的相似性,用等效分布传输线网络模拟给定结构,在时间和空间上进行离散化,是一种强有力的三维时域电磁场数值仿真算法。简要介绍三维扩展型结点TLM方法的模型、激励源和边界条件,并使用该方法对亚波长结构的抗反射特性进行模拟研究,为进一步深入探讨该结构的抗反射特性、进行优化设计提供依据。
文摘Several technical problems of numerical method in TLM procedures arediscussed.The bandwidth of single mode in four kinds of dielectric slab loaded rect-angular waveguides is investigated,and the optimum bandwidth which is related tothe dimensions and dielectric constants is obtained.These results are useful to the de-sign of dielectric slab loaded rectangular waveguide.
文摘In this paper,a lumped RC circuit model,which is based on the Transmission Line Modeling(TLM)method,is used to describe the space charge production and displacement mechanisms in three different solid dielectric materials(LDPE,PTFE and FR4).Each dielectric material is considered as a transmission line with the capacitive and resistance elements.The obtained circuit equations are solved along with the continuity equations for the various charged species in the bulk of solid dielectric material.The electric potential and field,density of different charged species and their recombination rates,resistive and capacitive properties of the solid dielectric material are calculated.In addition,the effects of the variations in the applied voltage,dielectric permittivity and temperature on these physical parameters are examined.Besides,compared with LDPE and PTFE,the net charge density increment rate in FR4 is much higher.Moreover,the influences of temperature on the net charge density in LDPE are not significant.Furthermore,at the higher applied voltages,the current density is increased.Interestingly,the effects of temperature variations on the recombination rates,net charge and current density in LDPE are much lower.Hence,the suitability of LDPE as solid dielectric material is proved.
