LCL Characteristics of Power Line for Power Line Communication Using Four Port Network Theory

We calculated the transmission characteristic and the degree of unbalance to the ground of the power line in high frequency band, in order to obtain characteristics of the power line. The calculation model of power line is made by a four port network theory, which has circuit constant as chain matrix of distributed constant on transmission line. And we compared the calculated value with the measured value. As the result, in transmission loss characteristic, it is confirmed that the calculation value agrees well with measurement value, by considering the conductance of the insulating dielectrics of a power line. From the comparison of measurement and calculation values with four port network, it is revealed that the frequency and the level occurring hump in LCL (Longitudinal Conversion Loss) characteristics agree well with each other. From the comparison of the calculation results of Method of Moment (MoM) and the four port network theory, it was shown that the four port network theory is better than MoM in calculation accuracy.