等效面 meaning in English
equivalent faces
isosurface
Examples
- Beginning with the equivalence principal , two types of near - field to far - field ( nfff ) transformation s are discussed systematically , i . e . frequency - domain nfff ( fd - nfff ) and time - domain nfff ( td - nfff ) . in td - nfff transformation , the concurrent - processing approach is used , where the contributions to far - field from the tangential electric current and magnetic current on the equivalence surface are calculated " on - the - fly " in step with the fdtd simulation . as a result , it is not necessary to store the tangential current components for every equivalence surface at every time step , and therefore reduce considerably computer storage required for the td - nfff transformation
在理论部分，本文从电磁场的等效原理出发，系统、详尽地论述了频域和时域近远场变换的基本思想，在时域近远场变换中采用实时的变换方法，即每进行一个时间步的迭代，就计算一次等效面上该时间步的切向电流和切向磁流对远场各方向的贡献，这样就使时域近远场变换不需要储存等效面上每一个时间步的切向电流和切向磁流，大大减小由于近远场变换而增加的计算机内存需要量。 - In order to validate the feasibility of the novel algorithm , ultrawide band pulse wave is used as incident wave . computational domains are limited by absorbing boundary condition . the transformation technique from near zone to far zone is used when the sampling spot is outside of the computational domains
时域成像技术以超宽带脉冲源作为入射波源，用吸收边界条件来界定计算域，而当采样点远离计算区域时，需要通过近?远场的转换技术把近场等效面上的信息转换到远场，本文采用简单而实用的柱面波外推法作为近?远场的转换方法，收到了较好的效果。