On the edge mode in the theory of TM scattering by a strip or strip grating

Consider a plane wave incident on a perfectly conducting strip (or strip grating), and let the incident electric vector be parallel with the edges of the strip. If the edge mode is included among the basis functions, it is found this greatly improves the convergence of the moment-method solution. Numerical data are included for the reflection coefficient of the strip grating. To correct an error in the previous literature, the rigorous solution is tabulated for broadside backscatter from a single strip.