# What is Fdtd: Definition and 12 Discussions

Finite-difference time-domain (FDTD) or Yee's method (named after the Chinese American applied mathematician Kane S. Yee, born 1934) is a numerical analysis technique used for modeling computational electrodynamics (finding approximate solutions to the associated system of differential equations). Since it is a time-domain method, FDTD solutions can cover a wide frequency range with a single simulation run, and treat nonlinear material properties in a natural way.
The FDTD method belongs in the general class of grid-based differential numerical modeling methods (finite difference methods). The time-dependent Maxwell's equations (in partial differential form) are discretized using central-difference approximations to the space and time partial derivatives. The resulting finite-difference equations are solved in either software or hardware in a leapfrog manner: the electric field vector components in a volume of space are solved at a given instant in time; then the magnetic field vector components in the same spatial volume are solved at the next instant in time; and the process is repeated over and over again until the desired transient or steady-state electromagnetic field behavior is fully evolved.

View More On Wikipedia.org
1. ### How to Choose Between FDTD, FEM and MoM | Open-Source Codes

Hi, I've just written an article about how to choose between FDTD, FEM and MoM for Electromagnetic Simulations, and also with brief reviews of some of the best Open Source alternatives out there. https://www.matecdev.com/posts/differences-fdtd-fem-mom.html I've seen that in this forum many...
2. ### How to get device phase in FDTD solution?

These days, I designed a Bragg grating using FDTD Solution. But when I try to get its phase information of the transmission spectrum, I meet some trouble. Could anyone give me some suggestion? Which monitor should I choose? Or should I use INTERCONNECTION? Thank you !
3. ### Fortran Solving Large/Infinite Results w/Yee 1D FDTD Code

Hello to all! I have written this 1D FDTD code but the results I take are very large and after some timestep they get to infinite/NaN... I really don't know what's wrong. The expressions I have used are the exact given solution for the Maxwell equations. Thank you for your help. program yee...
4. ### FDTD of (ultrasound) wave propagation through muscle

Im a mechanical engineering student currently, with a third year project of simulating ultrasound propagation through the abdomen. Currently i just want to simulate it going through muscle with no obstacles. I don't really understand where to start, I have formed some equations based on the wave...
5. ### How to use 3D FDTD code for 1D problem?

Hello, I have a three dimensional FDTD code. The problem I have for simulation is one dimensional. How can I use this 3D FDTD code for the 1D problem. The 1D problem is like this: in one-dimension half of the problem space is filled with a dielectric medium and the other half is free-space. A...
6. ### Can anyone provide the FDTD paper on Two Dimensional Plane Wave implementation?

Hi, I am looking for below paper. Already contact both writers but got no reply. Anyone who have this or can access this journal, can you please send it to me. Winton, S., and Rappaport, C. Implementation of a Two Dimensional Plane Wave FDTD Using One Dimensional FDTD on the Lattice Edges,''...
7. ### How to Model Drude Materials using FDTD

Hello all, I have been learning to use FDTD to model light interaction with various materials. I've successfully managed to model light interaction with semiconductors/insulators. However, I've been having trouble understanding how to incorporate metals into this model. The code becomes...
8. ### How to find Resonance frequency of rectangualr cavity from FDTD data

Hello, I have written 3D FDTD code with Mur ABC which gives correct results for time domain data. Now I want to compute the resonance frequency of a rectangular cavity using this 3D FDTD code. I don't know how I will do that. Would someone please advise me the steps I need to follow now to...
9. ### Fortran [Fortran90] fdtd in polar coordinates, got infinity output

hi all, attached here is my code for 2d fdtd in polar coordinates, from 'numerical electromagnetic: the fdtd method (umran s inan, pg 94-96) written in fortran90. I have try a few approach I could think about to troubleshoot this code but the output is still infinity. Anybody here can give me...
10. ### [2D FDTD TFSF problem] got error in result but don't know why

HI all, I did wrote codes for 2D FDTD TFSF TMZ mode using yee algorithm. But the output I got was not as expected. The curve was bended, and major leaking after some time when approaching ilast, jlast. Can anyone help me to analyze the output graph eg, why the leaking happened, and why the...
11. ### How to put mur's absorbing boundary condition in 1d fdtd maxwell equation

hi can anyone teach me how to put Mur's ABC in my fortran code for 1d fdtd maxwell's equation as below !1d fdtd Simulation in free space subroutine fd1d01(f0,miu,delta,S,E0) implicit none double precision :: f0 !frequency double precision...
12. ### Numerical solution for 1d fdtd maxwell equation using yee algorithm

Homework Statement to compute 1d fdtd maxwell equation using yee algorithm with fortran 90Homework Equations 1D discretization for maxwell equation (TEM mode) : electric field vector: Ez(i-1/2,n+1/2) = Ca*(Ez(i-1/2,n-1/2) + Cb(Hy(i,n)-Hy(i-1,n) magnetic field Hy(i,n+1) = Da*(Hy(i,n) +...