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52 Threads found on Near Field Hfss
Hello. It's known that the magnetic antennas (magnetic loop and ferrite rod antenna) have huge magnetic field in the near field. I'm trying to obtain those figures (fields Report-MagE+MagH along the line inside vacuum box), but can't get any results... What is wrong? obrazk
I'm designing a wireless power transfer system in hfss using the magnetic near-field. The transmitter can be of any type but the receiver has to be small enough to be integrated within a device (between 1mm to 3mm thick). I'm designing the transmitter to be a helical coil as it has a large quality factor but a spiral, planar c
How much space are you modeling between the monopole and the absorbing boundaries? I'm not sure about the rules of thumb for hfss, but sometimes with 3D field solvers you need to have enough space to the absorbing boundaries to keep them out of the near field reactive zone, or you can get some funny results at some angles. (...)
I have never used the "near field Setup", so I am not sure how that even works. It might be that you don't want to actually use that setup. If I understand you correctly, you just want to plot the e-field in a plane above the surface resulting from "scattered" field right? If you used a plane wave excitation, then this (...)
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????
Dear all, I am planning to simulate, and in a single setup, an FSS-Antenna system. I need to study the effect of different field patterns of a source antenna on the performance of an FSS structure. The simulation scenario has the following givens: 1- An antenna, in both the radiative-near-field (Fresnel region) and (...)
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 (...)
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'm designing a wireless power transfer system in hfss using the magnetic near-field. The transmitter can be of any type but the receiver has to be small enough to be integrated within a device (between 1mm to 3mm thick). I'm designing the transmitter to be a helical coil as it has a large quality factor but a spiral, planar coil for the (...)
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? (...)
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,
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 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 (...)
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 (...)
haii iam new to hfss.. plz suggest me how to desgin near field reactangular patch array antenna(4x4) in hfss
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???????
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.
Forgot to add, first characterize your metamaterial and get the 'dispersion diagram' and identify your 'bandgap'. This bandgap will stay the same,for it near-fiel/far-field thing is irrelative. The next step then would be to put antenna on top of it and see the effect. The high-impedance surface will act as a perfect reflector only in the 'band-ga
Hello I desine a horn antenna by hfss and now I want to calculate the NFD and plot it versus frequency. NFD means near field directiviy of antenna, it describe by this equation "NFD=Pf/Pt" which Pf is the power radiated from the front face of the antenna and Pt is the total power radiated through all the surface of the air box (...)
The whole complication with near field analysis is that you have a radial component to your fields rather than just the typical far field "TEM". So, indeed your near field plots will be a function of the size of your near field sphere. I would use the (...)
Hi, I want to find the radar cross section for an object. I set the excitation to a planewave excitation but the problem is that I do not know where I should put it. Should it be in the far field or near field of the object. Does this incident field impact the RCS? Thanks
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
How to plot the phase of near H field along a line in hfss?
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
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?
Yes, you also have to be careful not to use lumped ports if they could possibly couple to other things near them. Since they are not de-embedded, you should be careful about using them at high frequencies.
Where can I find the near field RFID tag antenna model in hfss? Anyone has recommendations?
One way to determine the power in hfss is to use the field calculator and integrate the Poynting vector over the face through which the incident wave passes. This will give you Power flow. You can then adjust your hfss / fields / Edit Sources for the Incident Plane Wave to deliver the expected power near (...)
Hello everyone, I don't know if someone can help me on this. I am trying to solve a simple scattering problem from a PEC (perfect electric conductor) rectangular plate. I have an incident field, and I also have prepared a boundary condition on the plate (Rad1). Also I have completed the near and far field sphere setups. I analyze (...)
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
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.
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 (...)
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, 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 (...)
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 (...)
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! 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 (...)
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 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 (...)
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 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 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, 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 (...)
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
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.
Hello~. I want to know peak power in coaxial line or waveguide by mws or hfss. Please, let me know. Thank you. Hello.. simulate electric field distribution in your waveguide and find maximum value (usually near the transition). You can calculate (better to say estimate) maximum power then from breakdown of air (
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?
When using hfss to calculate frequencies ,I find two frequency are very near: 1.8640G 1.8643G Are the two modes degenerate modes?