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108 Threads found on Fdtd And Matlab
Hello, I have just started to learn about fdtd and electromagnetic simulation using this method. I have Sullivan's book about fdtd; but the code inside is not practical to run. it seems that there is a need to modify it. In order to write the codes in Visual C, I want to run in matlab (it is more suitable to simulate such (...)
hi; I'm working in ARM-fdtd (adaptative mesh refinement fdtd) in electromagnetic waves. That is a method to subgrid in fdtd. I 'm blocked in the implementation of the mesch refinement in the fdtd electromagnetics equations. Please help and if any one have matlab coding for ARM (...)
i need fdtd-1D (gauss source) matlab code and with PML. please!!! help me.
Hey I am using CST for 3D fdtd simulation. I can do 2D and 1D in C or matlab code but with 3D code becomes complicated hence I want to shift to CST. I understand that CST microwave studio can do the job for me. I just want 5x5x5 m 3D space and take a gaussian source somewhere within this space. I want to (...)
Electromagnetic Simulation Using the fdtd Method by Dennis M. Sullivan Try starting with this book.. I gives good theory and has some matlab codes too..!!
Hi I am doing research on photonics crystals, using fdtd method and the matlab code I have made it my GUI environment. Do you need to change the structure of the code is updated? In addition, the band gap and spray charts and I can not transfer power to get you please help me (...)
Hello sara67, If you go to my groups website, , and go under resources and you will find some lectures notes. They explain how to place devices on a grid for fdtd and other various numerical methods. Cesar
hi to all. does anyone have a matlab or C++ or fortran code for ADI-fdtd or Leapfrog-ADI-fdtd methods in 2D and 3D? or at least,there is anyone that is familiar with this methods in fdtd? if you have a code,please contact me. my email: and if you are (...)
hi all. I want to learn particle in cell and fdtd simulation.can enyone help me to learn it? Perhaps enyone have matlab code? Sorry, no. which book i want to study? What background do you have? How deeply to you want to study? What kind of problems do you want to solve? plea
hi. I have a question in fdtd and antenna feeding. I want to feed my DRA with coaxial cable and transmission line feed model.I wrote a code in matlab. do I have to use from thin-wire modeling,to model inner conductor of coaxial cable? how model outer conductor of coax? I'm confused really!!! please help me...
hi. I have a basic question in fdtd.I know formula and concepts of Huygens surface and I know formulas of near field to far field transformation (NFTFF) and also I can write matlab codes for this purpose.but I have a simple question. for NFTFF calculations,where I should place Huygens surface?before PML or (...)
hi. I have a can I convert a C code to matlab code?I have a fdtd code to C language and should convert it to matlab. how should do this work? please step by step tell me... thanks...
hi to all. I wrote a 3D-fdtd code in matlab. I have a cylindrical dielectric antenna that surrounded by air(epsr=1).I know maxwell equations and discretized forms of them both in vaccum and dielectric.but I donn't know how import a coaxial feed to my dielectric antenna.this antenna is like of monopole antenna. I placed a (...)
hi to all. why in my 3D fdtd matlab code fields become very big?for example they are from order of 1e20! why my code become divergence? how should set a proper source for my cylindrical dielectric antenna? do I set proper permitivity in programming or should use from averaged permitivity in interface of dielectic antenna-air? this permitivity
hi friends. I wrote a 3D fdtd matlab code in cartesian coordinates with first order Mur ABC. but I don't konw why my Fields become very big (in order of 1e20!!!). can anyone find it's reason and find my error? I don't konw how import a current source to bottom surface of my antenna. my antenna is dielectric with high negative (...)
Hi ghasem_008, - here is a free full 3d fdtd program: Maybe this helps? :-) best: Ricy are you? i need to help... anyone does have 2D fdtd (finite difference time domain) or FDFD (finite difference frequency domain) matlab code for solving mawxell equations in a dispersive medium ba ABC PML? my antenna has cylindrical configuration with medium dispersive. if you have this code,please help me. i have another question: wha
I have used a 2D fdtd matlab code from Hagness/Taflove to compute the scattered near field from a vertically orientated conducting cylinder. I have then computed an equivalent model from a commercial 3D MOM package and calculated the scattered H filed in the near field at the same location as in the fdtd model(i.e. apart (...)
can anybady help me about the fdtd NL in matlab to calcul the efficacité GSH (generation second harmonic) and the transmissin.... i need it pleazzzzzzzzzzzzzzzzzzzz help me :cry:
Hello, I am studying fdtd with Sullivan's book. I have a problem on calculating bessel function expansion calculation along the main axis of a dielectric sphere in fig 4.7. I used matlab-funtions in "matlab functions for mie scattering and absorption" to get mie coefficients and calculated internal (...)
Dear friends I'm trying to execute the fdtd code of this book: "The Finite Difference Time Domain Method for Electromagnetics With matlab Simulations" In the chapter 3 I want to the see the objects defined by the define_geometry.m and show something like the following Figure. 67956 disp('defining the prob
Hi everyone, I am dealing with 2D fdtd simulation in Cylindrical coordinate system. I attached my matlab code but there is some problem which i dont undersand. It seems as dispersion but time and space increments obey Caurant stability condition. Can someone post me fdtd code in Cylindrical coordinates (...)
You could be more precise in stating what you do and what you do not understand. For example is the problem 1) matlab 2) fdtd 3) the telegraphers equation
Hi, I want model a simple transmission line using FEM and i want to write a code in matlab. so can any one tell me a good reference of modelling equations. I have Coded 1D fdtd for a transmission line modelling using the book "Computational Electromagnetics" by David B. Davidson but For 1D FEM case this refence doesnot explain the (...)
This appears to have already been discussed in Actually, the guy's real name is Denis M. Sullivan and the book is "Electromagnetic Simulation Using the fdtd Method" - next time please give some more information, but you got me interested enough to find all that out myself. :-)
Greetings! and a Happy NY ;) I'd like to find out Any Information about using fdtd in the field of Acoustic Wave Propagation Research. Here , in attach , it is a description of related problem. Now I have the discrete model of acoustic noise emission, resulting from the continuous model by its finite-difference approximation of second order
i simulate in matlab with fdtd to evaluated SAR and i need model for visible human any one know site or others or can to send it me ? thanks in advance excuse my bad english help me please i cant advance in my thesis and any one have an idea for wath in can to do for article its welcom thanks
pleasee help I need help to implement the TFSF plane wave with fdtd in matlab 3D I have 2D code but it doesn't much help I have not found any code related to the 3D Rotem
Hi, I'm trying to implement nonorthogonal fdtd mixed with orthogonal fdtd in 2D in matlab but i have some problems to define the cells which are nonorthogonal, i don't know if i have to use the basis vector which define these cells for the neighbour cells. I let the code here and i hope some of you can help me.
I have a problem with a technique with particular focus on non-reflecting boundary conditions and handling non-Cartesian surfaces. The balance between numerical efficiency and accuracy, in particular with regard to the approximation of the non-Cartesian surface have to be explored. My problem is the following two-dimensional problem : (...)
i am working on the same project by using finit difference time domain please if you have any information or matlab code for fdtd Added after 3 minutes: i have this one wich i got it from IEEE ''chracteristics of equilateral triangular patch antenna using cavity'' model and it shows the resonante frequenc
hi, can anybody help me with writing a fdtd code in matlab for 3 rectangular split rings placed periodically so as to calculate its S11 and other parameters like refractive index etc..
Does anyone know how to code an fdtd code in matlab for a dielectric slab? I don't mind being pointed in the helpful resources so that I do my own reading. The slab is like three horizontal slabs (like a sandwidch) and the EM waves propagate in the middle slab
hi, I'm new in fdtd, can anyone help me? how can I learn it fast? :?:
Can someone help me to calculate the reflection and transmission coefficient for a periodic structure? The fdtd domain is excited by a plane wave using TF/SF technique. Can any one send me a matlab or c++ code for that?
Hi How can I define plane wave source in matlab, in fdtd algorithm with PML? The source is in 3d and transmitted to +z only from XY plane in coordinate Z=Z0. Now I use pointed source but it's temporary I checked some codes like the one above but it's not suit can someone help me with that
do any one have matlab code for lumped element modeling using fdtd method and coaxial cabel modeling using fdtd method plz
Hi all, I have some difficulty to write Fortran77 programs for fdtd method. I couldn't find any book for this. If anyone want to help me, please, suggest some books. If possible, please upload or send to my mail. If anyone have Fortran77 code for fdtd method then kindly send to my mail ID - bhrigu[/em
hii i want display the cylindrical object using fdtd in matlab. plz also tell me how can i define voltage and current source for cylindrical probe in matlab using fdtd method.
hii plz tell me how can a define and create 50 ohm coaxial probe for exciting the antenna in fdtd??????? plz tell me the exact alogorithm for creating cylinder in matlab. i tried for defining cylindrical object in matlab but i don't where is the problem. here i am giving matlab code plz tell me where (...)
there are one very good book titles as "The fdtd method for electromagnetics with matlab Simulation" by Atef Elsherbeni and vensyl Demir . this book published by Scitech publication . in this author provide matlab code for every step by step to solve problem in fdtd.
hii anyone can tell me how can i define cylindrical structure in fdtd.
Hi all, i am a new comer in the area of photonics. i want to analyse the band structure of Metal photonic crystal (2D) using fdtd. Have anyone matlab code for it?Plz send me that code i shall be highly obliged to him. My email is: thanks
Hello Everyone. I´m computing a fdtd simulator to study the radio channel characteristics using power delay profile. I use a scenario 2550px x 2550px and I need more than 2 hours to have some kind of results. I´m reading about parallel computing with parallel computing toolbox and I tried some stuff...without good results... Tried to (...)
To start with any 3d fdtd code should do. The far field computation is a separate issue. The main question is whether you are going to continuously update the far fields during the fdtd simulation or use a post-processing step In any case I would go one step at a time and if problems occur post them as concisely as possible here.
Help ! I want to have a model in a free space and within a house respectivly , that's to say ,get a human body or otherthing ,moving or not, using fdtd , modeled and simulated.Who can give me some codes based on matlab or others ,and tell me how to make the human body or something other into the free space (...)
Help ! I want to have a model in a free space and within a house respectivly , that's to say ,get a human body or otherthing ,moving or not, using fdtd , modeled and simulated.Who can give me some codes based on matlab or others ,and tell me how to make the human body or something other into the free space (...)
hello Dear, i need fdtd code in matlab for rectangular dielectric resonator antenna analysis. i want to calculate its return loss curve , input impedance and far field pattern . plz help me. anybody wants to help me then also send me at
do any body have this book plz 'The Finite Difference Time Domain Method for Electromagnetics: With matlab Simulations' by Atef Elsherbeni and Veysel Demir
Hi I have written a 3D fdtd sample code by matlab based on Sulivan book. ABC used for these codes is PML with 7 cells.