This work is supposed to contribute to the development of researches in the area of Patch Antenna. The general purpose involves a Microstrip antenna on Photonic Band Gap structure. The use of this structure implies in the reduction of the troublesome surface waves that plague the performance of these antennas and complicate its theoretical modeling. The FDTD approach is used because of its versatility to study the reflection, refraction and diffraction phenomena. For such problem, an absorbing boundary condition must be introduced at the outer lattice boundary to simulate the extension of the lattice to infinity. In this case, it is very important to avoid parasitic reflections and due this the UPML is used. Here, an efficient code using parallel processing is applied. 1
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