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38 Threads found on Finite Field
Hi, first off all you need to understand the Radiation Boundary you use. The thing you want to simulate is the far field characteristics of your antenna in an infinitly large air box. As this cannot be designed you put the radiation boundary at the end of a finite airbox. This boundary is shall absorb all incoming waves but to work well it must be
Usually, simulation tools allow visualizing the fields that are simulated. For example, for capacitive coupling, electric field lines would tell where capacitance is coming from (in finite element or finite difference method based tools), or a surface charge density (in boundary element tools). Very often just viewing the (...)
You could also apply a "finite conductivity" boundary and set the properties to be that of copper.
We recently published a paper that describes a very simple and powerful technique for implementing total-field/scattered-field sources in the finite-difference frequency-domain method. The paper also serves as a brief tutorial of the method. The paper is open access and freely available:
I am interesting in distributed hardware architectures. Especially: - what kind of software/hardware can be synthesized in a distributed manner - what are the current challenges in the field of synthesis of distributed systems Currently I am working on automatic synthesis of finite-state-machines working in rings. Let me know, if you wan
Hi, I've developped an online tool for generating a finite field multiplier with any primary polynomial. You can try it at .
Why not begin with the simple point/line source? You might also want to read: 1) The finite difference time domain for electromagnetic by Kunz 2) Electromagnetic simulation using FDTD method by Dennis Sullivan
For AES alone, you dont need montgomery multiplication. for public key, you do need montgomery multiplication. You can understand the algorithm and code it yourself. I have a reference but its in VHDL finite-field Arithmetic Circuits Under chapter 3, see article 3.4.3
I am confused in calculating inverse in finite field Gf( 2^8 ) using extended euclidean method of (x6+x4+x+1)^-1mod (mod x8+x4+x3+x+1)
Hello. I am trying to calculate the electrostatic field on a coupled microstrip enclosed withing a ground plane using finite difference method. the coupled microstrip rests on a 1mm thick dielectric, the rest is just air. The space where I compute the field is 5x5mm. 10V common mode is imposed on the coupled microstip. I wrote some (...)
Hi, I finished my work on RS code for a long time. I think you know that the basic concept of RS code is based on finite field (so, primitive polynomial too). I remember that I did not generate primitive polynomials , but found them on the appendix of some textbooks. With selected primitive polynomial , i can use it to generate binary repre
See Allen Taflove's book. The name is Computational Electrodynamics: The finite-Difference Time-Domain Method. You can find it in www dot 4shared dot com
Hi,people. My question is about finite difference modeling of EM fields. Exist some methods to force numeric divergence be zero, not changing too much the overall field picture? Like / dx + / dy + / dz = 0. Theoretically Maxwell equations maintain divergence st
Yes. However, in an inhomogeneous field and with finite toroid diameter, the cancellation isn't complete.
For a finite size you can use plane wave excitation but you will have to calculate the reflected power using field calculator yourself.
Hi all, I need to simulate an infinite (in the y direction) dielectric slab with finite width (in the x direction) in COMSOL and see the scattering field, but I do not know how to set the absorbing boundary condition at the edges of the slab. Does anyone know how to simulate infinite-length geometries in the 2D RF (...)
Generally the magnetic filed around a coild can be calculated by integrating the contribution of individual current elements according to Biot-Savarts law. There are also free tools as Quickfield Student Version that allow finite element analysis of simple coil geometries.
In FDTD, the fields are known only at discrete points. Maxwell's equations are approximated using finite-differences which generates one equation for every field component at every point. These equations include field components at surrounding points. At the edge of your grid, you will be required to include a (...)
Just look for materials on the finite element method for electromagnetics. 99% of the material you will find is FEM is in the frequency-domain. Time-domain FEM is quite rare because it has some problems, but it certainly exists. -Tip
Because it is an infinite wire use the BS formulation of finite straight wire to the case of infinite wire. Here because the wire is along the x-axis, the x-ordinate (1) is of no importance, as any x-ordinate is identical w.r.t. infinite wire. The distance of the field point from the wire is R = (2^2 + (...)
In electromagnetics, finite element analysis (or finite element method) is almost always in the frequency-domain by default. So FEFD in your case is really just the standard FEA or FEM you will read about anywhere in electromagnetics. There are time-domain finite-element algorithms, but they are the exception right now. -Tip
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 (...)
Is radiated em wave (esp. for far-field) of a simple antenna a finite sum of multipole waves? Since I think at resonance the antenna may be approximated by some dipole or quadrpole.
Of course there can't be a true plane wave with finite width. Why not use infinitely wide plane wave?
Hi where or how can i find the vhdl codes for 1.permutation instructions such as GRP 2.Modular multiplications such as montgomery algorithm 3.finite field operations
Because the conductivity for PEC is infinity, you can't have a finite value of electric field at the boundary, otherwise singularity arises.
Hi all.... I am working on a project which requires finite field division algorithm... Any one who worked on finite field topic, please help me... thanks in advance chin
I used CST4.2 before, but the problem is that: First, it can not give the imaiginary part of the Charecteristic Impedance of a Microstrip line if the dialectrice between the two strips has finite conductivity like 5000S/m Second, it does not have the field Calculator like that in HFSS. So the post processing of the result is no
Magnetic field outside a long solenoid can never be zero. Because a solenoid of finite length will have edges and field will come out. However, if we imagine a straigth solenoid of infonite length or a toroid, it will not have edges from where lines of force can come out. therefore field would be zero outside a toroid or a (...)
Hi, Abdoeng: Yes if it is finite size ebg. You can use planewave and find the scattered field. If it is infinite periodical structure, it should be there for scattered field (assuming the size is finite). However, the reflection coefficient may not be implemented. Regards.
The holes have an effective mass in the lattice just as the electrons have an effective mass. The departing electrons take a finite time to move under the influence of an applied electric field. This makes the holes move with a finite time.
Hi tw20053010 ! To simulate how much losses you'll have in your structure, you don't need to solve the field inside the skin layer. You can do it later in postproc by integrating tangential surface H-field for example. Or you can define conductivity on your surface. "In HFSS, finite conductivity boundaries represent imperfect (...)
Hi, antenna_abc: The near field calculation on IE3D is based upon solving the PHI and A numerically. E and H are solved using finite differences on PHI and A. Also, the near field calculation on IE3D is not supposed to be used for the E and H fields at far distances. The calculation involves numerical calculation of (...)
HFSS uses finite element method. These are the books that might help you. If you are looking for a theoretical background - finite Elements for Electrical Engineers by Peter P. Silvester, Ronald L. Ferrari If you are looking for practical use of EM tools including HFSS - Microwave Circuit Modeling Using Electromagnetic field (...)
i am just now study rs codes and its implementation ,mainly specilized in efficient finite field arithmetic and vlsi implementation for error control codes application ! btw , the site cannot link, i thought it would useful for theory and practical realization
This is special tools used to solve the finite element problem.
The selection only affects the calculation of near- and far-field radiation during post processing. The 3D Post Processor models the boundary as a finite portion of an infinite, perfectly conducting plane. The words above is from the help of HFSS.But I am very clear about it.
finite-Difference Time-Domain (FDTD). The electric field is solved at a given instant in time, then the magnetic field is solved at the next instant in time, and the process is repeated over and over again. In order to have an aquarate solution the grid should be crowded, let say Lamda/10. Can you tell more about the stability? The (...)