A Note on the Complex Poynting Vector, and on the Fractional Current on the Upper Surface of a Microstrip Line

It is shown how the two forms E x H* and E* x H should be used when extracting reactance information from the complex Poynting Vector in a microstrip problem. When the strip is narrow, some of the axial current appears on top of the strip. Its value is calculated and the practical use of this information is indicated.