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73 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.
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. I´m new with HFSS, and i would like to know if there's some option for take the near field data, over a plane. For example, i have a horn antenna, linear polarization("y" axis), and i want the Ey field(real and imaginary components), over a plane in the "z" axis(direction of propagation of the wave). How could get it? (...)
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 (...)
Ask yourself how do you simulate "range"? Hint: you need to know the link budget first. As 13.56 MHz RFID uses magnetic near field, you should run near field simulation and you need to know the minimum required H-field (or B-field) for your tags. You may know that (...)
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
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.
A (simple ?) question An Em simulation tool allows me to get the 6 Re and Im part of the near-field E components (Ex Ey and Ez) in the t-domain. I need help about how to calculate the norm of this vector. This Em tools gives me the f-domain e-field which is also made of 6 components. Is it possible for (...)
I want to simulation of optical near field enhancement with CST MWS. Optical near field enhancement is the problem of optical frequency(hunderd Thz), and 10~100 nm size metal particle. So my simulation condition is so simple. 1. Make 100 nm sheroid with metalic. 2. Excite plane (...)
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 (...)
Hi; I am tring to make a simulation of the ellipse antenna in HFSS9.0. And I have reached some results. my far field pattern is good. But near field pattern isnt good between 300 - 60 degree. I dont understand why it isnt good. If somebody could tell it I will be glad.. thank you for your
You need to open the current distribution file. Then, you can select PROCESS->near field CALCULATION.
hi, I've tried to simulate an ebg structure using empire software. I used a plane wave excitation and near field to far field transformation as described by literature 'FDTD Modelling of finite size ebg structure' in empire website. But I receives an error 'ValueError: bad marshal data'. Somebody please help me suggesting what is wrong with (...)
Hello I have proposal of other approach to your problem. Did you try to find source of problems using near field probe connected to spectrum analyzer? I am just asking because building a model of your PCB may take a big amount of time (I am not familiar with CST - so I am not sure that you may import your design to CST). Additionally simulatio
Hi, i am trying to simulate a terminated meander line structure(@ 2GHz) on FR4 in CST. my main aim is to see the near field(at 1cm and 5cm) as well as the far field (at 3m) strength (preferably in microvolt/m) for different input power levels(0 to -20 dBm). But being unable to do that (as i am new to CST) i cant progress in my project. (...)
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
Hello! I do not have much experience with MV AWR office if someone could help, I'll be grateful, Coupling between coils in the near field UHF range, I will post a photo below what I have done already in MWO EM Structure I'll be grateful for all help I can get to simulate this. How can I draw the loop in AWR mw Office as easy as possible or
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
With the TFSF formulation available for FDTD why are people still contemplating NTFF solutions of analytical Far field formulations in general. I am not sure what you mean by "analytical Far field formulations". But I often use TFSF and NTFF together. TFSF = total field scattered field => used to insert pla
haii ..i want to design rfid near field rectangular array antenna...plz suggest me how to design the antenna..basic requirements.. and which software is suitable for this....plz suggest me because i dont have more knowledge in this.. i want to do this as my thesis work.
Hi all, I have a problem with Feko UTD simulation. The environment is very simple. I have a big box (2x2x6 meters) with inside an other box with only 2 faces and 4 pillar (see figure attached). The source is a spherical source. The frequency solve is 7 GHz and I calculate the near field in a plane with 21x21 point. The time for the (...)
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
Hi all, I have a GPS p@tch antenna with a very thick substate. Is there any way of extracting surface wave strength by software simulation or measurement? Cheers, Element7k Hi, buddy My suggestion is: - simulation in IE3D with infinite dielectric. This inf. dielectric layer will guide out the surface waves
You described how the model is built. Could you tell us the main idea of your custom post-processing code from which the leaky constant and pahse constant are extracted? I haven't opened your attachments, because I am not in office and don't have HFSS handy. From your desccription, I can see that your virtual box intersects with the antenna bod
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.
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
Hi: The .fdfield contains the frequency domain near field information. Whe a user defines SAR calculation (or frequency domain near field calculation), it will create this file. A user has a chose to ouptut E field only in the simulation setip. The (...)
hi, for microstrip port definition you need to draw your structure inside an air box with width of around 10 * microstrip line width and height about 5 * substrate thickness. then you define the port as the whole airbox side, using a wave port. the results should be very near to the measurements, I made some microstrip filters ad the measurem
Speaking generally, our life is harmful - nobody survived yet, except more than 6 billions hoping. But they wont do it better.) This doc has plenty other docs references, of course it is just first result of googling . It studies impact of RF diathermy (12 27
Going back to the initial question. How to estimate the loading effect of antenna? You can’t (without a EM simulator), but you can avoid. Try to keep clear the Reactive near field of the antenna, from any components, especially metals. Reactive_near_field = 0.62*SQRT(D?/λ), where D is the antenna dimension.
Hi, I downloaded your design but I do not understand the setup. If you would like to simulate a incident wave you should use a plane wave as excitation and not a WG-Port. In order to observe the resonance you can use a field probe near or inside the resonator since you will to get any S-Parameter. Only if the resonator is inside a cavity or i
Hi Logan, I am not very expert in RFID. But I think it all depends to the frequency of operation. For example in 13.56MHz systems, the tag should be in the near field of the reader. So the principle of power transfer is based on inductive coupling. Thus it is better to say the coil tag is an inductor. In the other hand, for very high frequen
Hi, kishorekumar_ms: It tells you that your domain is not large enough to enclose the structure. In order to do pattern calculation, a pattern box is defined internally for the near field to far field transformation. If not all of your dielectrics or metal is enclosed by the box, the results will be invalid. FIDELITY detects it (...)
I simulate again with solution frequency 3GHz, 3.1GHz, 3.2GHz, , but the result still change too much I see the following potential problems at your model : 1. You define high-eps substrate and infinitely thin ground. Such a combination leads to very sensitive behavior, depending on actual mesh. Better to draw real
Hello, you have to be careful when implementing the computational domain, if your cavity filled up the whole of your fdtd domain then U don't need to use any ABC at the boundary, except for the PEC BC that will represent the walls of the cavity, however, if your cavity does not fill the entire domain, you have to use ABC to terminate the computati
What am I doing wrong here? You are doing nothing serious wrong but you try to simulate a resonant structure so you must be more presize with mesh quality. There are couple advices : 1. If your structure has a symmetry plane - define it in HFSS as well (plane XY - PerfectH for your case) You will win doub
We know that the power and signal transmission in LF RFID system is based on a transformer model. So you only need to simulate the coupling factor between reader antenna and tag antenna. Then combine the coupling factor with other circuit parameters on both reader side and tag side, like the input impedance of reader and tag antennna, and tag load.
Hi, RCS = 4 X PI X R^2 (Mod(Es) ^2 / Mod(Ei)^2), where Es is the scattered E - field and Ei is the incident E - field. R is the distance from source to the scatterer. In FDTD if you want to implement this you need to implement a near field to far field transformer (Refer Taflove, Chapter 8, 3rd (...)
Hi all How can I compute electric field of the line source in a dielectric cylinder in 2D-FDTD simulation? Thank you.
Hi, sensen9966: Yes. If you use infinite gnd, you can't visualize the current distribution on the infinite gnd because it is not part of the primary solution. However, you can do a near field calculation and find the Hx and Hy on the surface. Jx = Hy and Jy = - Hx on the surface of the ground plane. Best regards,
You can download and use 4nec2: 4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler.
Hi , My RF module which is having PCB mounted PIFA antenna (2.4GHz) is near to the metal sheet which is of dim 10mm X 5mm. 1) What precautions should i take to minimize the losses. 2) Should i make slot in sheet 3) what should be the orientation of the antenna I would be great if anybody can give s
4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler.