Yee algorithm 3D FDTD code in C implementing the free space form

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This a very simple Yee algorithm 3D FDTD code in C implementing the free space form of Maxwell s equations on a Cartesian grid. There are no internal materials or geometry. The code as delivered simulates an idealized rectangular waveguide by treating the

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The Yee algorithm 3D FDTD code in C is implemented in a simple manner to simulate Maxwell's equations on a Cartesian grid. The code has been designed to be easy to understand and use. It is worth noting that the code only simulates an idealized rectangular waveguide with no internal materials or geometry. However, this limitation has been overcome by treating the interior of the mesh as free space/air and enforcing PEC (Perfect Electric Conductor) conditions on the faces of the mesh. This approach has helped to simplify the code and make it more accessible to users who may not have a deep understanding of the underlying principles. Overall, the code is a great starting point for those who are new to FDTD simulations and want to learn more about Maxwell's equations and their applications in the real world.