FDTD Simulation with Gaussian Pulse Excitation - MATLAB Implementation

This MATLAB-implemented FDTD (Finite-Difference Time-Domain) simulation program under Gaussian pulse excitation conditions employs a modular architecture with core functions including field update equations using Yee's algorithm, perfectly matched layer (PML) boundary conditions, and Gaussian pulse source implementation. The code structure features parameterized configuration files for easy customization of simulation domains, pulse characteristics (center frequency, bandwidth), and material properties. Key computational modules handle electromagnetic wave propagation through discrete Maxwell's equations solved using central-difference approximations in both time and space domains. The program's versatility extends to modeling complex scenarios including waveguide structures with mode analysis capabilities, metamaterial units with customized constitutive parameters, and plasmonic devices incorporating dispersive media via auxiliary differential equation (ADE) methods. The user interface provides intuitive parameter input sections for defining geometry dimensions, material layers, and excitation sources, while output modules generate time-domain field distributions, frequency-domain responses via FFT analysis, and visualization of propagation dynamics. Implementation highlights include efficient matrix operations for field updates, adaptive time stepping based on Courant stability condition, and memory-optimized data structures for large-scale simulations. The code supports various analysis applications in telecommunications (antenna radiation patterns), radar systems (scattering analysis), and photonic devices (optical waveguide modeling), making it a comprehensive computational electromagnetics tool for researchers and engineers.