Three-Dimensional FDTD Method for Far-Field Extrapolation Computation

This program implements far-field extrapolation calculations using the three-dimensional finite-difference time-domain (FDTD) method, serving as a powerful tool for electromagnetic simulations. Developed in MATLAB, the code employs Yee's algorithm for spatial discretization of Maxwell's equations and utilizes perfect matched layer (PML) boundary conditions to minimize reflections. The implementation includes key functions for near-field to far-field transformation using surface equivalence principles, where electromagnetic field data collected on a virtual surface is processed through vector potential calculations and radiation pattern generation. The program features modular architecture with separate functions for field updating, boundary handling, and far-field computation, allowing researchers to customize simulation parameters and analyze electromagnetic wave behavior across various environments. Its intuitive interface supports both time-domain field visualization and frequency-domain radiation pattern plotting, making it valuable for antenna design, radar cross-section analysis, and electromagnetic compatibility studies. The code efficiently handles large-scale simulations through optimized matrix operations and memory management techniques, providing accurate predictions for electronic device optimization and electromagnetic research applications.