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33 Threads found on edaboard.com: Fdtd Far

near field to far field transformation (FDTD)

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 in edge of PML?because as distance from

help to find my error in 3D-FDTD(important)

hi to all. I'm new to fdtd.I wrote a 3D fdtd matlab code in cartesian coordinate with Mur ABC of first order.I want see far-field pattern of my antenna. I completed code,but output is very big.for example my E_theta in terms of dB is about 900dB!!! you think where I mistake? how I can to find error in my code? I think that my geometry (...)

Far field program flowchart

Does my program flowchart of the fdtd far field calculation look correct. There is obviously much more detail in the calculation itself but does the flowchart make sense from a bird's eye view

Use Taylor series to show that the truncation error for the Yee?s FDTD method

Use Taylor series to show that the truncation error for the Yee’s fdtd method in a one-dimensional staggered grid is O(Δt2)in time and O(Δx2)in space. Are you assigning home-work to us?

Need to oblique incident fdtd code

hello I am desperately looking for a 2D fdtd code with an oblique plane incident wave! I have read many books but have difficulty implementing them so need a code to help! PLz! 8-O

3D FDTD microstrip patch antenna

@fogrin Did you check the other thread from yesterday (and the link there)? But again I do not know of any other fdtd book which has as many mistakes (in the code) as Sullivan.

TFSF formulation and Far field

With the TFSF formulation available for fdtd why are people still contemplating NTFF solutions of analytical far Field formulations in general. I am not sure what you mean by "analytical far Field formulations". But I often use TFSF and NTFF together. TFSF = total field scattered field => used to insert pla

searching for a stable subgrid implementation in FDTD

I am searching for a stable subgrid implementation. The methods I tried so far all get unstable after a while. If anybody here has experience with subgrids I would like to learn about your experiences. In particular stability for long running simulations is a concern. Thanks.

Need FDTD code in matlab for calculating far field, RDRA

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 (...)

any antenna using 3D-FDTD method

hello everybody.............. i want to solve the antenna parameters like return loss curve , input impedance and far field of probe feed rectangular DRA and i am unable to solve so plz help me ............. plz send me fully calculation of any antenna using 3D-fdtd method....i want to see how can i proceed ???????????????? provide me algorithm

FDTD matlab code for DRA questions - return loss curve

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

NEAR FIELD FAR FIEL TRNSFORMATION CODE

Do you have access to Sullivan's fdtd book? The code for this is in there. I have not ever written the near-to-far field transformation or I would just send you that. If you give me your e-mail address, I could perhaps send you whatevermaterials I have. -Tip

FDTD code for RDRA analysis i.e. its far field analysis,...

hello plz provide me the fdtd code for rectangular dielectric resonator antenna analysis i.e. its far field analysis,input impedance like . thanx

FDTD near to far field transformation C/C++ source code

Hi, I am looking for fdtd 3d near to far field transformation code in frequency domain written in C or C++. Please help. Thanks. madd

EBG Simulation using EMPIRE software

hi, I've tried to simulate an ebg structure using empire software. I used a plane wave excitation and near field to far field transformation as described by literature 'fdtd Modelling of finite size ebg structure' in empire website. But I receives an error 'ValueError: bad marshal data'. Somebody please help me suggesting what is wrong with my sim

computation of RCS in 2D-FDTD

Hi, RCS = 4 X PI X R^2 (Mod(Es) ^2 / Mod(Ei)^2), where Es is the scattered E - field and Ei is the incident E - field. R is the distance from source to the scatterer. In fdtd if you want to implement this you need to implement a near field to far field transformer (Refer Taflove, Chapter 8, 3rd Edition). (I haven't tried this implementation ye

FDTD Matlab Near to Far field transformation

Hello everyone, I'm trying to implement Near to far field transformation (frequency domain) for my fdtd code in matlab following taflove's books but it doesn't work. I honestly don't understand where I'm doing wrong because I'm following the books step by step. Does anybody have a 3D/2D working code and be so nice to share it? ( cb88(et)hw.ac.u

Can anybody help me for the CST Microwave studio ?? Theory

cst IS BASED ON FIT (finite integrations technique), not fdtd.

FDTD simulations and best hardware configuration

Hi, I'm trying to figure out the best hardware configuration for fdtd simulations in matlab. I hope that I'm not too much off topic, but I think that many other people will find this post useful. As far as I know, the last version(s) of matlab can use the multicore capability of the last CPUs for long vector and matrix operations by simply ticking

I need general Meshing algorithm

Hi everybody, I am trying to build a program that can be used for solving fdtd problems but I need algorithms to use for the meshing of the geometry and also allgorithm for near to far filed transformation. Regards

how to set grid size and time step for dispersive media

Recently, I'm using Rsoft's fdtd to simulate some dispersive media, that is, n+ki. I find when k is very large, suppose, 2+11i, the fdtd will scater. So I want to make sense of the grid size and time step. So far, I define grid size and time step based on lossless media, that is, grid size

Need code for Near-to-Far-Field Transformation

Hi, I'm using fdtd for my research and I would be very grateful if you could post or send me any sourcecode for a near to farfield transform. I've already tried to implement Taflove's book's frequency domain transform but I wasn't successful. Please send any code you might have to henlindg(at)hotmail.com Thanks!

Help me with scaling a FDTD with range of 100km

please i need help to solve this problem i need to simulat an optical fiber one dimension in fdtd but with i take the materieal to be dispersive and nonlinear and i need to get the electric field at very large distance like 100 km but in simulation i can not simulat this large domain so i need to make some scaling to the material to get the same

Information about Empire and its performance

Hi, I have never worked with Empire but as far as I know and I see on their web page it is just a brute force fdtd code without any advanced features like conformal geometry approximation (PBA,TST in CST) or sub mesh. Form this point of view I would prefer other tools. F.

NEAR-FIELD-TO-FAR FIELD TRANSFORMATION+ FDTD

can you give me your fdtd code ??

HUYGENS ' PRINCIPLE and FDTD

HI I try also to simulate the near field far field transformation with fdtd, for the analysis of a p.a.t.c.h microstip antenna to obtain the radiation pattern. I found many difficulties specially to understand the steps to follow to do this transformation. Could anyone help me ??

FDTD far field implementation

Hi everyone, I'm bit a of a beginner with fdtd and i'm looking for some examples of far field implementation (near 2 far transformation). Anyone could help me? I'd appreciate it.

Well, conceptly it can be done by near field and far field transformation. You can see the materials form any classic fdtd books. As for E plane and H plane, you only need to define an angle of radiation pattern you want to caculate such as fai=0 and fai=90

3D fdtd

FAr field of antenna in FDTD

Anyone has the MATLAB code for the far field of a dipole antenna????? Regards

HELP on Near-Field to FAR-FIELD Transform

Hi everyone! I'm trying to get some information on NF to FF transform an maybe any of you can help me. My problem is that I made some antenna measurements but my range is not long enough to fulfill the far-field condition (2*D^2/lambda) I thought that there might be some piece of software with wich I could process those measurements and get the re

Far field estimation pattern using FDTD

I believe you will need a technique originally developed for antenna measurements: near-field to far-field transformation. I did google search for "near-field to far-field" and fdtd, and got about 10 pages worth of (stuff).

Antenna Mutual cooupling measurement

Boy: You can firstly simulate it in CST or HFSS or fdtd! The result may be useful for you !