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1000 Threads found on edaboard.com: Near Field Simulation
Dear Friends, I have to make a near field simulation of dipole antenna array at 11 GHz... Aperture size is 1 meter... 32 dipole antennas are uniformly distributed through aperture (with equal step size) ... Unfortunately, as Tallface65 says, the array factor is not calculated for near field in HFSS... (...)
Dear Friends, I already made a mimo array near field simulation using cad feko as seen in figure-1... now I would like to get near field data from post feko... First of all, How to get phase data from post feko I do not know (see figure-2)... second, getting near (...)
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.
However, if I run the simulation with an airbox which is just very slightly larger than the antenna size, the simulated values become very close to the measured ones. Makes perfect sense. These low frequency "antenna" tags have negligible far field radiation. They work with inductive coupling in the near field only,
Hi, Currenntly, I am traying to simulate MIMO array using Feko... a mimo antenna consists of 4 transmitters positioned at outer (2 right outer side, 2 left outer side), 8 receivers positined inner...90914. by processing the data using Range migration algorithm, I would lke to reconstruct the sphere reflectivity functio
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 have a question about the antenna near field analysis. In order to analyze the near field of the printed antenna, we need to define the plane for display. It seems to me that we still need the radiation boundary in order to absort all the outgoing radiation wave. But my problem is that the wavelength (...)
I have 2 projects: The first is the simulation of the radiation in near field of a monopole antenna. In the second one, i want to import the excitation from the first one by using an excitation as a near field incident wave. can any one tell me how can i proceed. Thanks in advance..
hi i think you need to make sure your near field monitor is inside the simulation domain specified by you using boundary conditions you can manually add space or use open(add space) boundary condition to resolve this problem i hope this helps regards
Hi fcolleon firstly select insert near filed setup in the radiation tree and then select sphere secondly after simulation in the results select near filed data and in the results page you can select any plan you want by its theta and phi(fixed theta or fixed phi) I hope it'll be helpful
Hey Everybody, I'm simulating a DNG metamaterial in HFSS 12.1. I've already investigated the far-field behavior by simulating a unit-cell, utilizing master-slave boundaries to force the unit-cell behavior to be replicated and forcing a plane wave to impinge upon the infinite sheet of metamaterial by utilizing perfect E and perfect H boundaries o
Hello everyone, I'm using FEKO 5.4 and would like to determine the distance where the near-field converges to the far-field within a certain tolerance. I'm having a bit of difficulty in figuring out how to implement this entirely in FEKO. From what I can tell, I can't even subtract the near-fields from (...)
Hi, What happens if the sub-relfector is in the near of antenna's main feed in a dual-reflector antennas? As feeds are normally electrically large, their farfield distance is quite large! and What is the solution? Cheers, Hadi
Dear colleague, Nowadays the research on near-field Optics more and more concentrated on nanostructures. Is there someone also engaged in this topic? Let's share our experience on calculation, theory and experiment.
Hello, for an optic-design I need data of a near-field measurement of a LUXEON white emitter. I would like to use a Luxeon III but Lumileds told me that it is possible to use the near-field data of a Luxeon I too. Best regrads, cube007
I make some research on the probes for near field measurements, if you can help me by your ideas or documents I would be thankful to you.
some paper about near field measurement
hi, If any one has informations or documentations about near field measurements by probes; please put them in this sire. with regard.
Hi! It's me again... Related to what I posted before: Could GRASP8W do that transformation form NF to FF? I've heard it's possible to go from Far-field to near-field with that software, but is it to get FF values from a NF measurement? Thanx again! Mortin
Hi, Anybody nows the easiest way (or software) where you can import an antenna pattern or structure and check how much is the received field in the near field region or how this field diminishes in the near-field region with an increasing distance from the antenna? The interest here is for (...)
hi all i heared that i can use the near field electromagnetic ranging in locating objects so if any one have details about it ..................and any sites of projects made using this techinque because i wanna use it in my project for tracking my robot thanks for help
Hi, the farfield calculation in CST is easy and doesn't need an extra farfield probe. You just add the farfield monitor (solve -> field monitors -> farfield/RCS + frequency). You then will see the 3D farfield once the calculation is done. The bad thing is just that you will have to run the (...)
Hello all, A basic question :- The Rayleigh distance (2D? / λ) describes the radius for the near field region and depends upon the largest dimension of the antenna. Is this definiton of 'near-field region' valid for wire antennas ? Many Thanks
Hi savedadogs, near field Antennas Measurements by Dan slater - Artech House Should be useful to you. Cheers, Element7k 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.
Do you have any good ref or link on near field measurement methodes? and how the to measure EM field taking into account the distorted field induced by the probe
i need web site or note to let me know how to measure near field for small range antenna (3 meter ) with equation ? regards
i need web site or note to let me know how to measure near field for small range antenna (3 meter ) with equation ? regards
i need how can i measure near field antenna(small range antenna 3 meter ) in electromagntic plane ? regards
Hi, does anyone know that what is the difference of "near field" and "field" in HFSS. I try to plot the magnitude of the E-field along a specified polyline. But I cannot use "near field" option but only "field" Option. So what is the difference between them? Thanks
I am writing a final year project topic on Effect of the near field energy density distribution on Living cell. Please, does any one have a book that treat( or specialize in the analytic treatment of) near fields of Radiating antnna.Any help will be greatly appreciated.
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 (...)
Hi everyone, I will like to obtain a 3D polar plot of the near-fields (on a near-field sphere) of an antenna in HFSS but I am interested in the Htotal component. However, under report type "near-field", only the E field components are available. So my question goes... Can (...)
does anybody have references or book on near field boundaries? Otfen used is the rayleigh boundaries between the near field and far field (with 2D square/ lambda), but the EMC has a slighly diferent approach (with lambda/2 Pi) Thanks SunnySan Added after 13 minutes: I found a good paper from www.ednma
Dear all, I was trying to calculate near E field of structure consisting of dipole illuminating lossy dielectric brick with high er. Result is very strange, the E field (cut inside the brick) is decreasing monotically even at the boundary air-brick and it seems that the dielectric brick is ignored by near (...)
Hi! I'm new and I have a little experience with HFSS. I would like to simulate an array antenna (maybe using patch antennas or open ended waveguides) and to evaluate the near field across a plane in front of the array (about 10 waveleghts far from it). I have understood i need to solve only one element and then i have to set up the array defini
every one from field of electromagnetics knows that their exist to fieldS near field... and 2 far field but when comes to our result we always consider far field and pattern is always used why why not near field I CAME TO KNOW THAT (...)
For 3.5 Ghz antenna (used for wimax), how can I calculate the near field boundary or magnitude ?
Hi, I am trying to simulate pyramidal horn antenna (60GHz) and than consider the field distribution at the different distances from the antenna using far field/near field wave excitations and ?source?, ?target? projects. While near field excitations works well, far field (...)
hi, i am trying to design a compact cassegrain antenna where the shaped subreflector is in the near-field of the feed horn.now, my problem is that - how to see the near field (radiation) pattern in HFSS?? so that i can accordingly design the subreflector surface. if anybody knows the answer kindly share ur views here. (...)
I have used the near field setup with a line and I then plotted the electric field along this line. My question is whether there is a way to do this with the magnetic field as well? I havent been able to figure this out, and any help would be appreciated. Thanks in advance.
Hi, can anyone kindly tell me what is near field antenna ?Thanks in advance. Best Regards Xcy_antenna
Hi Ravi, You can use field monitor for measuring H field . near field is mainly due to magnetic coupling. H field will give you a measure of near field distribution. I guess you will be using some kind of Loop antenna, you can measure the surface current and magnetic (...)
hi plz tell me how we can see the near field distribution of an antenna in CST . is it possible to calculate near field in CST? also plz tell me something abt SAR analysis in CST?
Hi, Interesting blog about 3D field simulation by using CST's Microwave Studio. Alex:D
plz tell me i something about near field analysis of antenna in CST . is it possible to calculate the near field of antenna in CST? any one tell me how can i calculate the near field of antenna in CST?
Where can I find the near field RFID tag antenna model in HFSS? Anyone has recommendations?
Usually, loop antenna is a good way to realize near coupling. You can search some RFID antennas as examples. It can be realized by multilayer PCB, Flex Printed Circuit, or just wrap a wire to form a coil.
For a particular wavelength, the only way to reduce the near field (reactive or radiating) is to reduce the physical dimension of the antenna (at the expense of losing efficiency).
Hi, streamlet: In a 3D space, you can only display some quantity on a 2D plane. For far field, it is displaying the far field pattern on Theta and Phi. For near field, there are 3 variables there (x, y, z). One of the variables has to be discrete in order to be visualized in a 3D space. That is why you only see the cuts. (...)
Hi to all, I need the following paper: A near field focused microstrip array for a radiometric temperature sensor. I something about phased array (printed antenna) focused for near-field applications. Thank you so much