基于H边值关系的面电流定义的重构

Reconstruction of Surface Current Definition Based on the H Tangential Boundary Value Relation

本文从场强H边值关系的推演及面电流应用两个方面,揭示面电流的物理本质:将分布在媒质表面邻域内的体电流等效为二维平面上的电流,引入面电流密度Js表征电荷在二维面空间上的运动特点。同时,由场强E的边值关系以及微分形式的欧姆定律可知由于不同媒质电导率间的差异,媒质分界面处电流密度的切向分量将发生突变。然而切向电流密度的突变并不会导致面电流的产生。

In this paper,the physical essence of surface current is revealed from two aspects:the deduction of boundary condition of magnetic field H and the application of surface current.Essentially,the volume current distributed in the neighborhood of the medium surface is equivalent to the surface current on the two-dimensional plane.In order to quantitatively characterize the motion characteristics of charge in two-dimensional surface space,the surface current density Js sis introduced.In addition,according to the boundary condition of electric field E and Ohm's law of differential form,we can know that due to the difference of conductivity of different media,the tangential component of current density is not continuous at the interface of different media.However,the mutation of tangential current density will not generate surface current.