3D FDTD MATLAB Source Code for Electromagnetic Simulation

This article presents MATLAB source code for 3D FDTD (Finite-Difference Time-Domain) simulation, designed to model electromagnetic wave propagation and reflection phenomena. The code implementation includes core FDTD algorithm components such as Yee cell discretization, where electric and magnetic fields are staggered in both space and time dimensions. Key parameters and variables configurable in the code include electromagnetic wave frequency specifications, material properties of propagation media (permittivity, permeability, conductivity), and boundary condition setups like Perfectly Matched Layer (PML) absorption boundaries. The modular structure allows researchers to modify and optimize parameters according to specific simulation requirements, enabling precise modeling of desired electromagnetic behaviors. The code architecture supports extensions through additional functionality integration, such as incorporating custom dispersion models, nonlinear material properties, or advanced excitation sources. Core functions handle field updates through Maxwell's curl equations using centered difference approximations, with separate routines for E-field and H-field calculations that maintain numerical stability through the leapfrog time-stepping scheme. This MATLAB source code serves as a versatile foundation for electromagnetic simulation studies, providing researchers with a flexible toolset for investigating wave propagation characteristics, scattering analysis, and antenna design applications. The implementation follows standard FDTD methodology while maintaining readability for educational and research purposes, making it suitable for both academic studies and practical engineering applications in computational electromagnetics.