CST工作室套装简介.ppt

CST STUDIO SUITETM CST MWS理论简介 有限积分法 ? Maxwell积分方程 b e 将实体数字化（离散化） 每一个“单元格”都有不同的材料属性 实体空间 （核磁共振成像 头部数据） 单元格 有限积分法：Yee网格（空间离散化） bn el ej ei ek 有限积分法： 麦克斯韦方程的离散化 有限积分法：解析到网格的一一映照 1976导出 Maxwell积分方程 Maxwell网格方程 FI div curl = 0 S C = 0 curl grad = 0 T ~ C S = 0 FI 有限积分法：通用算法 Maxwell 网格方程 瞬态场(慢变) MWS MAFIA EMS 静电场 静磁场 稳恒电流 粒子跟踪 简谐场 瞬态场(快变) 自洽带电粒子 PS 本征场 CST专有技术1：PBATM – 理想边界拟合 1998 CST Microwave Studio 1.0 CST专有技术2：TST – 薄片技术 2002 CST Microwave Studio 4.0 薄片技术 1个网格允许有3种材料 N (网格节点数) CPU时间 FE MOM, BEM M ( ) = r b e 隐式算法 TLM FDTD, FITD ( ) = M ( ) b b e (n+1) e (n) 显式算法 计算时间：有限元 vs 有限积分 T ~ N 2 T ~ N 1.1-1.2 有限元 CPU时间与网格节点数平方成正比 有限积分 CPU时间与网格节点数成超线性关系 时域有限积分：“蛙跳”算法(frog leap)—时间离散化 t 没有矩阵的求逆过程 ! ( ) = M ( ) e e b (n+1) b (n) 显式时域积分 仿真算法的比较 Freq Domain Solvers FEM, MoM, FIT 隐式算法  ( A x = b ) 窄带稳态 Time Domain Solvers FIT, FDTD, TLM 显式算法 ( xn+1 = M xn ) 宽频瞬态 CST MAFIA MWS CST 同时拥有频域和时域两种求解器 谢谢！ * At this point the theoretical background of the method shall be illuminated All electromagnetic phenomena in calssical electrodynamics are described by the four Maxwell equations. They are known as Faraday‘s law, Ampere‘s, the non-existence of magnetic charges and Gauss law. The compact form in which they were written is deluding. Attempts to solve them analytically are only successful in very simply structure under certain assumptions. Because of the complexity of today’s electromagnetic problem’s analytical solutions are often not practicable. Besides the truly analytic solutions, there are also semi analytic approaches known, where the final solution is derived by numerical evaluation of analytically based fundamental solutions. There are several numerical solutions to Maxwell‘s equations. Most of them apply only to specific problems. Various methods like the Finite Element Method, the Method Of Momentum, Finite Difference Time Domain a