POWER BASED CONSIDERATIONS ON THE SPECTRAL-DOMAIN ANALYSIS OF LEAKY WAVES IN COVERED STRIP-LIKE TRANSMISSION-LINES

The paper analyses the power flux characteristics of the different rep resentations of the electromagnetic field of leaky modes in covered lo ssless strip-like structures in terms of nonuniform modes of the backg round parallel plate waveguide. Spectral domain analysis is used to co mpute the propagation characteristics of leaky wave solutions. The rel ation between the choice of the inversion contour for the spectral Gre en dyad and the field expansion in background waveguide modes is also investigated and the radiated power flux associated with each expansio n (or inversion contour choice) is shown. Finally, we discuss the cond itions of excitation for the different leaky wave solutions that can b e obtained following different Green dyad inversion contours.