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# Near Far

147 Threads found on edaboard.com: Near Far

## NEAR-FIELD-TO-FAR FIELD TRANSFORMATION+ FDTD

HELLO please i need help I need to put calculation of radiation pattern in my FDTD code. I read the taflove and sullivan book but its very confusing Anyone can explain step-by step procedure?or any other advice :cry: thank you

## Descriptive echo canceler for hybrid network phones

Do you need a traditional hybrid circuit or a DSP echo canceller for long delay times? For telephony near end echo cancellation is done inside the new generation DSP codecs. You can read in this article more: For far end echo cancellation you can use dedicated DSP

## How to get the H-plane and E-plane in the far field in HFSS

How does one create a near field sphere setup ? Is it by clicking on the sphere icon (yellow ball) on top ? Thank you. xxxx

## near-field antenna simulation example

Hi, In HFSS, Analyze at you would with far-field simulation. When Analysis is done, Create a line on which the field is to be measure, then select Result/CreateReport/near-field. Regards.

## Near-Field to Far-Field Transformation

Hi all, I would like to learn the basics of near-field to far-field transformations for antennas. Can anyone suggest a book, paper, or link? Thank you.

## Anechoic Chamber Problem

Hi, everyone, I have a question about the EM anechoic chamber dimension and test frequency. There is one chamber in my school with about 7 mx5 mx2.5 m, two dimension. so what's the frequency range for far field test in this chamber? or is it possible to test far field? The other question is that if the result is near field, is it (...)

## HUYGENS ' PRINCIPLE and FDTD

Hi jeanne In order to determine the radiation pattern at a point of frequency, freq.domain near-to-far-field transformation technique is more useful, easier and more memory-efficient than time-domain technique. Using real-time DFT technique, equivalent surface current on the virtual surface surrounding antenna will be calculated. I reccom

## Is anybody familiar with XFDTD?

For near field pattern, please refer to ricy's post. For radiation pattern, after you compute the far-field Data, you should have files such as projectname.tvp0.tb0.te360.in5, etc. It was organized as #angle Ephi mag Etheta mag Ephi phase Etheta phase

## field calculation away from an antenna

Hi, I was wondering which simulator people would recommend in the following scenario. Imagine that the problem is the estimation of the near and far field several tenths of meters away from an antenna (near and far field) by considering also the reflected contribution from a ground plane. A simulator that has already (...)

## Near Field Region for Wire Antennas - ?

Hi, there was a great paper on one of the latest AP-magazine (2-3 month ago), discussing near fields of wire antennas. Check it... If I remember, they were talking about much bigger distances for real far-field, several λ

## What are the principles or techniques for VHF board design?

If you use an external oscillator, you should provide a separate ground for it and preferably to avoid have signal traces routed near or around it. As much as possible, route them in space far from it. You might not need a guard ring or special isolation as it is only 70-MHz. If you have digital and analog parts, use separate power and ground, a

## A way to launch evanescent waves in MWS?

is there a way to launch an evanescent wave (inhomogeneous plane wave) in to the computational domain in MWS? such an feature would be quite usefull if one wants to analyze the contribution of homogeneous and inhomogeneous (evanescent waves) to the near field and far field (seperately) radiation properties.

## omnidirectional antenna

I can recommend this software: 4nec2 is a completely free Nec2 / Nec4 and windows based tool for creating, viewing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near- and far-field radiation patterns for both the starting and experienced antenna modeler:

## How to plot the near field in HFSS?

Anyone know how to plot the near field in HFSS?help me please.What is the different between the near fields and the far fields in HFSS simulation?

## 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.

## antenna design for small rfid tag needed !

Hi Zbigniew, take into account that the distance is small in relation with wavelength, so the antennas are in near field (induction region) rather in far field (radiation region). The coupling properties are quite different. If you use coils, you should think in mutual coupling rather than in radiation pattern. The power transfer can be very go

## C pointer related question

near and far pointers are not part of the C language. They are unpleasant extensions provided by some compilers. In some DOS C compilers, near pointers are 16-bit offsets into the current data segment, and far pointers are normalized 32-bit pointers to the entire memory address space. This is messy business. Search Google (...)

## what best book of antenna analysis?

Pattern measurement on millimetric frequency exclude near field mesurement. A good way still remain the far field measurement with rotor, goniometer etc. etc. I don't think it's a matter for a book, in any case i've found useful info on: Clarricoats, Olver - Corrugated horns for microwave antennas - Peter Peregrinus - ISBN 0 86341 003 0. (paragra

## The difference between "pec" and "pec+infinit

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.