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85 Threads found on Near Field Hfss
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, 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 (...)
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 (...)
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 (...)
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 (...)
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'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 (...)
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, 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 (...)
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.
Where can I find the near field RFID tag antenna model in hfss? Anyone has recommendations?
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
I'm trying to simulate the near-field of a circular patch antenna driven by 2 probe feeds that are 90 degrees out of phase. Also, the center of the patch antenna is grounded. The model simulates fine (at 915 MHz), and I'm able to obtain some near-field plots using a sphere via the radiation menu in the project tree. (...)
Hi, Yes I know, but since I use far radiation boundary for my antenna, there is no need any more to use a near field one, and this for the same reason I specified above. I mean that near fields can be plotted anywhere inside the far field radion boundary, so why do I need to use the (...)
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,
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... (...)
A dipole array is boxed in a rectangular box similar to radiation boundary box in hfss. It radiates at 915MHz. The wavelength at 915MHz is 32cm. The far field is > 16cm. Can the power radiated be measured, say at 10 cm (in the near field) right outside the rectangular box assuming rectangular box is 10cm wide and long? (...)
I want to use metamaterial for near field Imaging and want to show focusing of design is a dipole antenna which is placed placed just behind Metamaterial slab array,now i want to show focusing of field on a plane can i do this in hfss????
You'll need to set up an 'infinite sphere' for far or near field under radiation. The 3d plot is pretty easy to get as a report but have a look at the coordinate sys on the 3d plot - the phi and theta are reversed. Something to keep in mind when you want a specific cut.
I'm sure you can do this: Right click Results > Create report > Select S-par then OK > on SOLUTION (left-hand side), select Setup1 SWEEP, Then select the frequency you want > ADD TRACE (bottom of window), then keep adding several traces. NOTE: this works with S-Par ONLY. If you select field or near-field, you'll ONLY see 1 frequency at a (...)
How does one create a near field sphere setup ? Is it by clicking on the sphere icon (yellow ball) on top ? Thank you. xxxx
Catalyst I want to stress that hfss stands for High Frequency structure simulator. Therefore 13 MHz would not seem like a high frequency. And yes, a quarter-wavelength distance from the nearest radiating edge is required for the radiation boundary. PML would reduce your simulation time as the distance can reduce down to lamda/6 to lamda/10. In
I'm sorry for bothering you. I'd like to simulate the following structure (see figure): a) A 3mm-diameter loop receiver is placed on a small substrate. b) The receiver and the substrate are then put in a plastic closed-end cylindrical tube (5mm diameter, 0.5mm thick). c) the excitation-source is placed outside the cylindrical-tube, near th
That happens to me too....a while ago.... I could not find any explanation, some of my especulations are that the antenna is not efficient in radiation. It accepts the whole energy but it does not put in a far field way. I found some while ago someone that was experimenting with antennas no effectives. In othe words, it was some sore of a
I will like to obtain a data table of the Complex nearEtheta and Complex nearEPhi values on a near field sphere around my antenna in hfss. However, hfss gives me only real values for these quantities when I attempt the near field Plot. I don't know what the (...)
Hi all, After I finished simulating a planar array, I CAN plot S11 but I CANNOT plot the fields: After create-report for the near or far field, the plot shows that the field (or the gain, or Etotal, or anything else) is "nan", which I think means infinitely small number or something ?. This despite I've added the (...)
Hello, I am wondering if anyone can help me. I need a tutorial for hfss software that will allow me to investigate shielding of different materials/shapes due to far and near field sources. I would like to look at different parameters (e field, hfield) etc. Please help. Thanks.
Hi everyone, I have a problem with my antenna horn simulation. Basically, i'm simulating an existing horn antenna, get the near field and then do the transformation for the far field. However, I couldn't get the simulation to work in the first place. First, I get this warning "given the specified frequency and model dimensions, an (...)
If I wanted to determine the phase center I would try to plot a near field phase front and use the curvature to define a phase center. I have not tried it myself and would be interested to know how the effort works out. I do not know of a post-processor feature in hfss for that evaluation.
hey guys can u help me ... i have created a model in hfss for a loop antenna and for analysing the near field setup .... i am not able to add the magnetic field parameters in the output variables .... can anyone help me ...? please
Hi all, Sorry for asking the following dumb questions. I have this loop in hfss and I would like to connect that loop to 1Watt of power, then 2Watts, of a sinusoidal signal of 150 MHz. I would like to find out the exact magnetic field (A/m) *AND* the received power at a very short distance around the loop. A) I've tried to set the loop
How to simulate a pattern, but not exactly in the far field. I need the pattern somewere in between near and far fied zone. Any ideas?
We have used hfss to model antenna's within the body. WillEd's method is the way we have used when designing antennas for use on implants. We found keeping the structure simple shortens the simulation time without degrading the results. However we also found with "body tissue" dielectrics with relatively high conductivities patches don't work
It is an antenna with many reflectors in the near field, and I have to change the swiching combinations of the switchs in the reflectors in order to get different signals. And the problem is that there are so many reflectors and so many switches in each reflector. Then it must be done automatically by a program or something, but I don't know
Hello friends, This is my first post on the website even though I have been on it for over 2 months and I have found everyone's responses very useful in understanding the workings of hfss. Currently, I am having an issue with meshing of a large structure. The structure consists of concentric cylindrical rings of varying material parameters.
Hello everybody, I'm fairly new to this site and to hfss as well, and had a couple questions about running some simulations of a circular patch antenna. My actual (already fabricated) patch antenna has a single probe feed, but the signal is split in 2 components which are 90 degrees out of phase. These 2 out of phase signals excite the antenn
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
Hi all, I want to simulate a simple coil and view the magnetic field of the coil (on a free space/vacuum). I used the helix option to build the coil and with a vacuum cylinder for surrounding the coil. How I define the boundaries and the excitations? What kind of port I need to define? Lumped port or Wave port? and where (in the cylinder surr
I only see the Antenna Parameters (like power radiated, power incident, power accepted, etc...) for Far field. It does not do it in near field, why? Impractical? Thanks.
hi tallface thanks for reply i look it for define the slant POL and i understand that for X-pol i should define axial ratio and arg of it and that E shows near field and not related to pol E do u have idea about this ? any one have horn with Circular pol for X band???????
haii iam new to hfss.. plz suggest me how to desgin near field reactangular patch array antenna(4x4) in hfss
I totally agree with BigBoss. In addition, sometimes the software that works better is the one whose simulated results are closer to the measured data. However, current softwares are really efficient, and most times disagreements are only due to the fabrication tolerances, or on the source definition. However, nowadays designs are simulated with a
I'm thinking of simulating a 4:1 balun made from a half-wave section of cable. Clearly as the operating frequency departs from the exact frequency the balun is designed for, the balun will become less effective. I'm wondering how I could measure this in hfss? I was thinking of something like looking at the near field around the coax feed (...)
hiii; i am too planning to work on near field imaging using metamaterial ..can you help me in setting up some starting simulation in hfss
1. If I am going to have a receive antenna in simulation model, why do I need a radiation box? The radiation box measures the power radiated, gain, the far field, but what if I have an antenna in far filed to measure all that? 2. Also, the minimum radiation box size of lambda/4 is not in the far field since minimum distance in f
In hfss, my understanding is that power radiated from antenna is calculated at radiation box? So, does the radiation box act as a receive antenna? In real world scenario, what is the method to measure power radiated from an antenna? Isn't it to have a receive antenna in the far field or even the near field? Thanks.
I'm trying to study a colinear antenna in hfss. This is fed at the bottom. Obviously, unless completely balanced the coax will radiate, but I'd like to try to determine how good/bad this is and whether changes made improve or worsten this problem. To me at least, putting ferrite beads on the feeder does not really solve the problem, as you solve on
Hello Guys, At the lab I have an electric field probe hanging on top of an electrical structure which has a large number of wire bonds. The wire-bonds pick up noise when an electric field is produced near them (capacitive coupling). What I would like to do is to model this phenomenon. I have already drawn the structure with the (...)
I am trying to make some structure shown in the attach picture. This structure should have uniform near field magnetic field on one side of it. As it is differential mode, so I was trying to use driven terminal. But when I set the wave port, it says that no conductor found on the port. I am sure I set the material right and there do is (...)