Dyadic Green´s function for an electric current source in the unit cell of a periodic structure

In this paper the dyadic Green´s function and expressions for the fields due to an electric current source in a Floquet phase-shift-wall waveguide (unit cell) are derived. The expressions are valid in the entire unit cell region including the source. Numerical results for the scattering from a conducting strip in a unit cell using these expressions are in a good agreement with numerical results obtained by the HFSS code. The dyadic Green´s function can be used in future analyses of phased arrays and metamaterials.