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## Finite Field |

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total field scattered field , near field far field matlab , field field fdtd , near field far field code

38 Threads found on edaboard.com: **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

Electromagnetic Design and Simulation :: 11-14-2016 11:30 :: Daniel_G :: Replies: **2** :: Views: **516**

Usually, simulation tools allow visualizing the **field**s 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 (...)

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 11-13-2016 02:21 :: timof :: Replies: **2** :: Views: **517**

You could also apply a "**finite** conductivity" boundary and set the properties to be that of copper.

Electromagnetic Design and Simulation :: 10-08-2015 14:40 :: PlanarMetamaterials :: Replies: **2** :: Views: **452**

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:

Electromagnetic Design and Simulation :: 05-05-2013 14:45 :: rrumpf :: Replies: **0** :: Views: **832**

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

Heuristic methods, Machine Learning, AI, and Soft Computing :: 02-17-2012 11:36 :: tariavo :: Replies: **0** :: Views: **702**

Hi, I've developped an online tool for generating a **finite** **field** multiplier with any primary polynomial. You can try it at .

ASIC Design Methodologies and Tools (Digital) :: 09-17-2011 16:13 :: sycolegend :: Replies: **2** :: Views: **1438**

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

Electromagnetic Design and Simulation :: 12-21-2010 22:50 :: Kohi_boy :: Replies: **8** :: Views: **2189**

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

ASIC Design Methodologies and Tools (Digital) :: 11-13-2010 17:06 :: tariq786 :: Replies: **4** :: Views: **4267**

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)

Mathematics and Physics :: 10-25-2010 17:31 :: BAT_MAN :: Replies: **0** :: Views: **2555**

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 (...)

Electromagnetic Design and Simulation :: 06-20-2010 10:51 :: iggyboy :: Replies: **2** :: Views: **1740**

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

Digital communication :: 03-02-2010 02:26 :: puripong :: Replies: **1** :: Views: **660**

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

Electromagnetic Design and Simulation :: 01-04-2010 12:43 :: maxwell.j.c :: Replies: **11** :: Views: **2743**

Hi,people.
My question is about **finite** difference modeling of EM **field**s.
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

Electromagnetic Design and Simulation :: 10-15-2009 11:39 :: computer1 :: Replies: **0** :: Views: **1110**

Yes. However, in an inhomogeneous **field** and with **finite** toroid diameter, the cancellation isn't complete.

Elementary Electronic Questions :: 08-31-2009 06:44 :: FvM :: Replies: **3** :: Views: **950**

For a **finite** size you can use plane wave excitation but you will have to calculate the reflected power using **field** calculator yourself.

Electromagnetic Design and Simulation :: 07-13-2009 18:34 :: mideoguns :: Replies: **2** :: Views: **1511**

Hi all,
I need to simulate an in**finite** (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 in**finite**-length geometries in the 2D RF (...)

Electromagnetic Design and Simulation :: 05-19-2009 13:04 :: iaia :: Replies: **0** :: Views: **2230**

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 Quick**field** Student Version that allow **finite** element analysis of simple coil geometries.

RF, Microwave, Antennas and Optics :: 03-16-2009 07:31 :: FvM :: Replies: **4** :: Views: **1884**

In FDTD, the **field**s 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 (...)

Electromagnetic Design and Simulation :: 01-16-2009 02:01 :: rrumpf :: Replies: **6** :: Views: **1700**

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

Electromagnetic Design and Simulation :: 12-23-2008 21:59 :: rrumpf :: Replies: **1** :: Views: **1314**

An in**finite** current filament carries a current of 3A and lies along the x-axis. Using Biot-Savart Law, find the magnectic **field** intensity in cartesian coordinates at a point P(-1,3,2).
dH = I vec{dl} x hat{R} / 4piR^2
let substitude hat{R} with vec{R} / R
then dH = I vec{dl} x vec{R} / 4piR^3
vec{R} = hat{x}(-1-x) + hat{y}3 + hat{z}2 an

Elementary Electronic Questions :: 10-28-2008 03:01 :: kingmaker :: Replies: **2** :: Views: **1745**

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

Electromagnetic Design and Simulation :: 08-23-2008 19:44 :: rrumpf :: Replies: **1** :: Views: **978**

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 (...)

Electromagnetic Design and Simulation :: 07-16-2008 14:55 :: yvonne82 :: Replies: **3** :: Views: **1789**

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.

Electromagnetic Design and Simulation :: 01-03-2008 13:34 :: wandering heart :: Replies: **4** :: Views: **1436**

Of course there can't be a true plane wave with **finite** width.
Why not use in**finite**ly wide plane wave?

Electromagnetic Design and Simulation :: 01-03-2008 13:30 :: wandering heart :: Replies: **6** :: Views: **1347**

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

PLD, SPLD, GAL, CPLD, FPGA Design :: 09-29-2007 08:59 :: 2M :: Replies: **2** :: Views: **1220**

Because the conductivity for PEC is infinity, you can't
have a **finite** value of electric **field** at the boundary,
otherwise singularity arises.

Electromagnetic Design and Simulation :: 09-17-2007 00:39 :: wandering heart :: Replies: **4** :: Views: **1144**

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

Mathematics and Physics :: 08-02-2007 12:00 :: chin :: Replies: **0** :: Views: **879**

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

Electromagnetic Design and Simulation :: 06-27-2007 03:15 :: maxwellian :: Replies: **3** :: Views: **1061**

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 (...)

Mathematics and Physics :: 06-09-2007 11:54 :: nonlinear :: Replies: **2** :: Views: **2185**

Hi, Abdoeng:
Yes if it is **finite** size ebg. You can use planewave and find the scattered **field**. If it is in**finite** periodical structure, it should be there for scattered **field** (assuming the size is **finite**). However, the reflection coefficient may not be implemented. Regards.

Electromagnetic Design and Simulation :: 03-31-2007 17:06 :: jian :: Replies: **4** :: Views: **1024**

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.

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 11-29-2006 15:55 :: flatulent :: Replies: **4** :: Views: **1991**

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 (...)

Electromagnetic Design and Simulation :: 07-27-2006 22:53 :: navuho :: Replies: **3** :: Views: **4047**

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 **field**s at far distances. The calculation involves numerical calculation of (...)

Electromagnetic Design and Simulation :: 06-08-2006 02:10 :: jian :: Replies: **3** :: Views: **1726**

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** (...)

Electromagnetic Design and Simulation :: 06-08-2005 20:35 :: rito :: Replies: **12** :: Views: **6193**

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

Digital Signal Processing :: 05-30-2005 06:28 :: sxqzj :: Replies: **6** :: Views: **4394**

This is special tools used to solve the **finite** element problem.

Elementary Electronic Questions :: 12-17-2004 21:00 :: videohu :: Replies: **7** :: Views: **2841**

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 in**finite**, perfectly conducting plane.
The words above is from the help of HFSS.But I am very clear about it.

Electromagnetic Design and Simulation :: 10-07-2004 08:02 :: mwhero :: Replies: **1** :: Views: **995**

RF, Microwave, Antennas and Optics :: 09-19-2004 19:22 :: DJ :: Replies: **5** :: Views: **1120**

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