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An Analytical Antenna Modeling of Electromagnetic Wave Propagation in Inhomogeneous Media Using FDTD: A Comprehensive

Dafnik Saril Kumar David¹, Yeongseok Jeong¹, Yin Chao Wu¹

¹Department of Civil Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA.

Sensors (Basel, Switzerland)

|April 28, 2023

Summary

This study develops a numerical model for electromagnetic wave propagation in inhomogeneous media using the finite difference time domain method. The model accurately predicts wave behavior and validates against experimental data for materials like concrete and asphalt.

Keywords:

EM wave GPR finite difference time domain ground-penetrating radar

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Finite Element Modelling of a Cellular Electric Microenvironment

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Published on: May 18, 2021

Area of Science:

Electromagnetics
Materials Science
Computational Physics

Background:

Characterizing electromagnetic (EM) wave propagation in inhomogeneous media presents significant challenges.
Accurate material property determination (dielectric constant, conductivity, magnetic permeability) is vital for EM wave analysis.

Purpose of the Study:

Develop a numerical model for EM antennas using the finite difference time domain (FDTD) method.
Enhance understanding of EM wave phenomena in complex materials.
Validate the model's accuracy against experimental data.

Main Methods:

Utilized the finite difference time domain (FDTD) method for numerical modeling.
Analyzed various antenna models with diverse materials (absorber, polyethylene, perfect electrical conductors).
Modeled inhomogeneous mixtures with randomly distributed aggregates and voids.

Main Results:

Achieved accurate analytical signal responses verified against experimental data for antenna models.
Successfully modeled and verified the behavior of EM waves in inhomogeneous media.
Demonstrated the practicality and reliability of inhomogeneous models using experimental radar responses.

Conclusions:

The FDTD numerical model provides a reliable tool for analyzing EM wave propagation in inhomogeneous materials.
The study successfully bridges the gap between numerical simulation and experimental validation in EM wave characterization.
Findings are applicable to understanding wave behavior in real-world composite materials like concrete and asphalt.