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Implementation of Floquet Boundary Conditions in FDTD Analysis of Periodic Phased Array Antennas with Skewed Grid

The Floquet (periodic) theorem is implemented in finite difference time domain (FDTD) for the analysis of periodic phased array antennas. The array grid of interest is considered to be generally skewed and this required a new procedure in the implementation of the Floquet theorem in FDTD. Numerical results for triangular antenna arrays are given to validate the proposed method of solution.