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147 Threads found on edaboard.com: Near Far
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
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 does one create a near field sphere setup ? Is it by clicking on the sphere icon (yellow ball) on top ? Thank you. xxxx
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.
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.
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 (...)
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
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
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 (...)
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
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
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.
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:
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?
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.
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
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 (...)
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 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.
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