In this lesson we will analyze a probe-fed rectangular patch antenna as the model for Floquet port analysis, which is created using the Antenna Tool Kit present in Ansys HFSS. Assigning of coupled lattice pair boundaries is discussed to enforce the periodicity in the geometry model. This lesson also explains the setup of modes using the mode calculator, which will generate a table with mode type and attenuation. We will do analysis setup, analyze the model, and look at the return loss and gain plot.