EMC On System Interconnection

In this paper, basic transmission line equation and four kinds of lumped-circuit model were constructed according to transmission line theory, microwave network, antenna theory and matrix theory. Three types of transmission line model were given by different reference conductor, which may be wire, ground or overall cylindrical shield. Based on previous theory, coupling model of field-to-single conductor transmission line was constructed, including perfect and imperfect ground. Extending transmission line equation into multi-conductor transmission line equation, using model decomposition & Chain Parameter Matrix to solve crosstalk voltage and current in homogeneous and inhomogeneous medium, and considering boundary condition or termination-networks at the ends of the line, then the crosstalk voltage and current of the nearest end and the farthest end to/from generator-circuit source were solved. Coupling equations of field-to-multi-conductor transmission line were build by considered incidence field as voltage source or current source. The per-unit-length capacitance matrix used in multi-conductor transmission line coupling equation can be solved by Moment Method. Some programs, which are coupling program of field-to-single conductor transmission line in perfect and imperfect ground, crosstalk program of multi-conductor transmission line in perfect and imperfect conductor and per-unit-length capacitance matrix program, are compiled to be solved induced voltage and current. Some examples of field-to-single conductor transmission line for different interference source were build to be solve induced voltage and current, of multi-conductor for different reference conductor were build to be solve crosstalk voltage and current. Results are analyzed and verified in detail and general principle.