The Analysis And Research Of EMC On Multiconductor Transmission Lines

Firstly, by utilizing the theory of multiconductor transmission lines, this thesis analyses the physical meaning of per-unit-length inductance(L), capacitance(C),resistance and conductance matrixes and how to get them by experimental methods. By making use of the background of theory, three models are established, include: normal transmission lines, ribbon cable, printed circuit board(PCB) trace, which generally, externally describe actual circumstances. Secondly, some software corresponding to models are programmed, which including: the calculation of normal transmission lines L, C applying to n pieces of wide-separation non-shielded wires, n pieces of wires above a conducting plane, and n pieces of wires within a conducting shield, calculation of ribbon cable L, C applying to ribbon cable, calculation of PCB trace L, C applying to PCB trace. Calculation of frequency-domain response takes the L, C as input, and can calculation the crosstalk voltage of corresponding transmission lines. Finally actual data of devices are introduced to software, and the simulation chart and conclusion which are satisfied with demand of company are gained, as a design reference, they exert an important effect.