59 Threads found on edaboard.com: Hfss Convergence
what can i do, besides increassing maximum number of passes and decressing maximum delat energy
to get more accurate results?
Electromagnetic Design and Simulation :: 09-27-2016 09:14 :: chenfire :: Replies: 3 :: Views: 482
i am designing a wave guide whose side walls are sinusoidal corrugated. the corrugation of the walls depend on several parameter parameter, one is called delta which supposed to be very small. i design a matlab code that generate the same result of hfss but only for small values of delta, and an upper bound on value of delta need to be known b
Electromagnetic Design and Simulation :: 04-09-2016 23:20 :: IssaW :: Replies: 2 :: Views: 524
Yes, that's a lot of points for a regular PC and that will take time to finish. I use a server farm for jobs of that size and larger. Usually, I'll use 8 cores and 16GB to 64GB of memory for jobs requiring hundreds of thousands of tetrahedra.
One thing I noticed is that it says "N/A" at the 6th adaptive mesh. Did you stop and start this mo
RF, Microwave, Antennas and Optics :: 02-17-2016 19:02 :: Felis_Silvestris :: Replies: 5 :: Views: 412
Iv'e simulated an EBG structure described in IEEE paper simulated with hfss but my results are very far from the paper's results. What's my mistakes?
It's a fat-dipole antenna above an EBG structure. See it.
Substrate is FR4 (relative permittivity 4.5) and all dimentions described in the paper:
Electromagnetic Design and Simulation :: 02-04-2016 10:52 :: rizoeda :: Replies: 6 :: Views: 922
I think that because you're near or exactly at the resonant frequency, the field change rapidly, so hfss doesn't find an ideal adaptative mesh. I mean that between to simulations the S parameters evolve rapidly so the difference in S parameters changes and the convergence is not reached. A solution will be to take a solution frequency greater
RF, Microwave, Antennas and Optics :: 02-01-2016 12:14 :: eraste :: Replies: 3 :: Views: 650
I just started working with hfss a while ago, so i´m still not totally aware of all relevant settings in my simulations.
The following problem is nagging me right now:
I am designing patch antennas that should work for a frequency range from 76-81GHz and transmit into a WR12 Waveguide. I got a few promising designs out of it and
RF, Microwave, Antennas and Optics :: 01-28-2016 15:44 :: mav3rik :: Replies: 3 :: Views: 588
Building a microstrip patch antenna on hfss. I used a wave port and de-embedded it to start on the beginning of the inset feed of the transmission line. During the solution, the convergence is not happening even though i have 30 passes with DS = 0.01. The results are very big like 5.7e+86 etc.. Any thoughts?
Thanks in advance
RF, Microwave, Antennas and Optics :: 01-23-2016 11:19 :: Antros48 :: Replies: 8 :: Views: 556
Based on that information it seems that your port is adequately sized. Assuming its in the correct location as well, it does seem like this is a mesh/convergence issue. The default adaptive meshing in hfss is not particularly adequate unless you want to do alot more passes than you need to.
I would set up a seed mesh on the por
Electromagnetic Design and Simulation :: 03-17-2015 15:00 :: PlanarMetamaterials :: Replies: 5 :: Views: 806
i hae a prblem in my smulation for antenna monopole
when i run this prject this anayse is ok and run is about 2 hours and fnaly he dsplay me error in cnvergence
what is the solution please
Electromagnetic Design and Simulation :: 11-25-2014 14:17 :: ings :: Replies: 4 :: Views: 953
In working with CPW lines in hfss, I've found that meshing the air gaps with a maximum length of half the gap width is sufficient for good convergence. I've also found that meshing the air gap seems to be more important than meshing the strip, which it appears what you are doing.
Electromagnetic Design and Simulation :: 11-25-2014 18:02 :: PlanarMetamaterials :: Replies: 2 :: Views: 1724
I am trying to simulate a structure in hfss and it does not have large number of meshes. Near convergence ( around 20 passes ) the total number elements are 286540. But my simulation slows down while computing Kyrlov matrices etc.
I have to finish this simulation and to see the results. I will be very thankful for quick help.
RF, Microwave, Antennas and Optics :: 09-27-2014 22:46 :: soaringeagle :: Replies: 2 :: Views: 810
I am doing simulation on corrugated horn antenna in 15 GHz using hfss . after completing the simulation it gives following warning
Adaptive Passes did not converge based on specified criteria.
Normal completion of simulation on server: Local Machine.
How can i remove this warning message and what do the
Electromagnetic Design and Simulation :: 05-22-2014 13:55 :: xx_kitaro :: Replies: 2 :: Views: 873
Newbee, first post, and still learning the rules and etiquette of this place. Be easy, k.
Here's the synopsis: I'm running an hfss driven terminal solution. The design is a spiral transformer--a single loop primary around a flat archemedean spiral of a few turns.
I've read in various places that specifying port impedance does no
Electromagnetic Design and Simulation :: 01-21-2014 15:08 :: hermit :: Replies: 2 :: Views: 823
Take into account that in ADS Momentum Ground plane is infinite,not the same in hfss, so as jeedur says, a difference is expected.
RF, Microwave, Antennas and Optics :: 11-08-2013 07:28 :: svia :: Replies: 7 :: Views: 535
simple, try it in CST time domain solver, the you know which hfss version is more reliable.
Electromagnetic Design and Simulation :: 10-29-2013 19:11 :: zhul3 :: Replies: 1 :: Views: 854
I met a problem when I use hfss's Driven Terminal to simulate a structure. It is a warning, "Fast sweep setup, process hf3d: Poor convergence in seeding data." My simulation setup is following,
Solution Frequency: 14.25GHz
- Adaptive Solutions
Maximum Number of: 20
Maximum Delta S: 0.02
- Adaptive Options
Electromagnetic Design and Simulation :: 10-12-2013 03:17 :: jianke :: Replies: 0 :: Views: 964
i am facing a problem,when i designed antenna and simulate i got convergence and got good results but when i simulate on same pc after 1 hour i got some results very different from previous one,i checked only differnce in both design is convergence point and max delta number,results that normaly changes are axial ratio and gain normaaly changes
Electromagnetic Design and Simulation :: 09-30-2013 01:07 :: aniakhan :: Replies: 3 :: Views: 677
I have calculated E field and stored energy in a cavity using hfss eigen mode. So maximum delta (resonant) frequency is used as convergence criteria in this mode. Now there is a question: How E field or stored energy can be used as convergence criteria in eigen mode?
Electromagnetic Design and Simulation :: 04-24-2013 00:19 :: xyz1380 :: Replies: 0 :: Views: 583
I am using a metamaterial as superstate to enhance gain of antenna.When i use 10 pass with center frequency 2.5 GHz for the frequency range of 1-3 GHz using fast sweep i got good result.But when i use 10 pass with center frequency 2 GHz for same frequency range of 1-3 GHz
i got poor both the cases hfss shows that convergence criteria i
Electromagnetic Design and Simulation :: 09-28-2012 16:45 :: abhisheksarkhel :: Replies: 3 :: Views: 962
i read hfss user guide 11 but not able to understand the significance of convergence,
adaptive meshing, discrete meshin,
when we should choose in analysis set up as fast, linearcount , discrete and what they all mean
help in this respect
RF, Microwave, Antennas and Optics :: 06-07-2012 07:04 :: kartikkhurana :: Replies: 2 :: Views: 772
The attached hfss file is for a half-wave dipole for 14.2 MHz. The dipole is only just over 1 m long, but is emmersed in water, so the relative permttivity is around 91, so it should resonate around 14.2 MHz or so, though perhaps a bit higher, as there is not a huge amount of water.
The problem is, the mesh will not converge. It slowly converge
Electromagnetic Design and Simulation :: 05-25-2012 21:40 :: DeboraHarry :: Replies: 0 :: Views: 1068
i want to learn basic concepts for hfss design and is meant by each step in designing this tutorial
so that i can design a microstrip patch antenna
can u give me a good tutorial of cst microwave studio with lot of examples of design of patch antenna
Do you want tutorials on hfss or CST
Electromagnetic Design and Simulation :: 01-30-2012 13:06 :: drkirkby :: Replies: 5 :: Views: 1516
I am facing problems with meshing in hfss for a waveguide filter design
Can u suggest me any document of hfss inorder to setup the meshing and its convergence..
I can share my file with u ..if required.
Electromagnetic Design and Simulation :: 12-19-2011 19:08 :: venu.gongal :: Replies: 2 :: Views: 1792
In hfss, I have found that some settings affected significantly final results. If you were not to mind about simulation time, what values do you set to hfss analysis parameters. For example, Maximum number of passes = 50, Max. Delta S = 0.001, ect.
Please suggest ...
Thanks a lot :)
Electromagnetic Design and Simulation :: 10-09-2011 19:31 :: DoYouLinux :: Replies: 2 :: Views: 891
I am designing a dipole meander line antenna using hfss for RFID application that suppose to resonate around 1.5GHz frequency. And my Solutions frequency is 1.5Ghz, with sweep setup of fast sweep, sweeping from 500MHz to 2Ghz. I am using a wave port with an air box.
I have modeled the antenna in hfss and after the simulation, the (...)
Electromagnetic Design and Simulation :: 02-19-2011 15:37 :: kmmaran :: Replies: 5 :: Views: 2057
I am simulating a 2-18 GHz cavity backed spiral antenna in hfss but I am getting these warnings (mentioned below) in fast sweep when I decrease the spiral arm width to anything below 0.25 mm. I have searched alot on google and hfss guides but there is nothing on these warnings.
How can i remove this warning message and what do these war
RF, Microwave, Antennas and Optics :: 12-10-2010 11:49 :: ahsaan :: Replies: 2 :: Views: 6036
Why simulators like hfss and CST use (as a default) absolute convergence criterion not relative? I guess the last method could be more accurate because it for example can make difference between s11(n)=1, s11(n-1)=0.9 and s11(n)=0.2, s11(n-1)=0.1. In the first case relative error is 11% in the second - 200%, but absolute error is constant = 0.1. W
Electromagnetic Design and Simulation :: 11-25-2010 17:36 :: pir0texnik :: Replies: 0 :: Views: 1165
Fast sweep setup, process hf3d: Poor convergence in computing port dispersion.
this is a warning i have some questions about:
1. what does it refer to?
2. what is "port dispersion"?
3. how can i control or determine the properties of this convergence?
4. to what level this error may effect my results?
Elementary Electronic Questions :: 10-24-2010 15:34 :: mac.feri :: Replies: 1 :: Views: 3366
I have done such a comparison between IE3D and hfss with the same structure, and a good match is achieved to give u some confidence. I suggest u to improve the convergence condition used in hfss.
Elementary Electronic Questions :: 10-20-2010 15:10 :: streamlet :: Replies: 1 :: Views: 873
I am using hfss for my PCB trace SI simulation. In my sweeps, the solver getting struck in one point at a particular interpolation error thinking that in that frequency convergence will occur. for example at freq 2.5 GHz where the interpolation error is 33%, the solver is thinking the convergence will occur at that frequency range (...)
Electromagnetic Design and Simulation :: 04-15-2010 17:12 :: mankan :: Replies: 0 :: Views: 1444
I have a problem with a simulation. The solution converges succesfully, but the results are not the waited. If I use a really low convergence condition, I get good results (not always).
Have you ever seen that problem? I think maybe there is something wrong in the model, and it causes errors if the mesh is enough fine. How do you se
Electromagnetic Design and Simulation :: 01-12-2010 08:21 :: Chourizo :: Replies: 0 :: Views: 1011
From the discussion the problem you are facing is not clear. kindly post your hfss model, after running the model the problem you are facing can be solved.
Electromagnetic Design and Simulation :: 10-23-2009 04:27 :: dee25pak :: Replies: 10 :: Views: 1705
You probably don't need deltaS that low. It defaults to .02, so unless you need some insane accuracy, you don't need .001. Try setting it at .01.
convergence is just when the deltaS gets below that value. Try setting it to deltaS=.01 and then forcing it to do 2 or 3 consecutive converged passes or something rather than a really low deltaS for (I
Electromagnetic Design and Simulation :: 10-21-2009 02:41 :: katko :: Replies: 3 :: Views: 2366
Can anybody upload(again) the CST and hfss project files for the Sievenpiper's structure?
Electromagnetic Design and Simulation :: 07-06-2009 13:09 :: kato01 :: Replies: 31 :: Views: 12421
does somebody know which mesh type is to chose in hfss for plane structures?
And if I have a radiation box which mesh type is to select for this.
I have read that for round structures with surface approximation the result will meet fast the convergence criterion. And to decide whether the mesh is good the optical look is important. Is
Electromagnetic Design and Simulation :: 02-16-2009 13:20 :: Heikoo :: Replies: 0 :: Views: 1712
What that means is that the convergence was not reached by your adaptive passes (that is delta S is not under 0.02, which is typical value). You need to let the hfss solve more passes (increase the max adaptive passes value in the analysis-setup window).
Electromagnetic Design and Simulation :: 10-09-2008 20:00 :: rfmw :: Replies: 2 :: Views: 10131
I am simulating a structure in hfss and plotting some complex quantities defined as output variables. Plotting the real and imaginary parts I have jumps in the graphs such that if I could flip the part over I would get the output I am expecting.
Does anybody ever had this problem before? How did you solve it?
Electromagnetic Design and Simulation :: 09-19-2008 22:02 :: famale :: Replies: 2 :: Views: 977
I am very new in the hfss field, and I have one question. I wonder why sometimes the solution does not converge even if the maximum number of adaptive passes is not reached yet.
Thanks for your answers.
Electromagnetic Design and Simulation :: 07-30-2008 14:25 :: kt302 :: Replies: 0 :: Views: 1298
I just need to know the exact definition of (solution frequency) in hfss?
hfss will optimize the mesh to reach convergence criteria at the solution frequency and eventually solve the field at that particular frequency only. When you choose "interpolation sweep", the rest of the frequencies are interpolated b
Electromagnetic Design and Simulation :: 07-12-2008 08:13 :: wlcsp :: Replies: 2 :: Views: 1619
I notice several things in hfss. Please confirm when you ever noticed the same:
1. The convergence profile/curve is not the same when change the sweep method e.g. fast sweep or interpolation. Although, all other parameters remain the same.
2. Interpolation sweep works better over a broadband frequencies.
Electromagnetic Design and Simulation :: 06-02-2008 08:32 :: wlcsp :: Replies: 1 :: Views: 1022
I ran an hfss simulation and after 7 passes, it reached my convergence criteria. However, it could not run the frequency sweep (Fast sweep) due to out of memory.
Is it possible to get the mesh after 6 passes? I am just wondering if using the mesh after 6 passes would help reduce the memory significantly.
Would changing to interpo
Electromagnetic Design and Simulation :: 05-30-2008 08:26 :: wlcsp :: Replies: 4 :: Views: 1085
See the attached hfss file. Apparently, S11 and S12 have artificial resonace around 1GHZ due to interpolation. This can be verified by sweeping using discrete type. does anyone have good idea how to solve the problem?
Electromagnetic Design and Simulation :: 08-16-2007 04:13 :: lhasayak :: Replies: 4 :: Views: 1512
my hfss is not currently working. you can also ask at
Electromagnetic Design and Simulation :: 05-30-2007 08:11 :: savedadogs :: Replies: 3 :: Views: 1178
I would recommend using more than 3 adaptive passes as a default. For hfss, I usually set deltaS to 0.005 and maximum number of passes to 10 or 12. Check the convergence before viewing the results. It is a good habit to get into.
Also remember that converging on input impedance is no guarantee that the radiation boundaries (and therefore gain,
Electromagnetic Design and Simulation :: 05-16-2006 22:37 :: antennas321 :: Replies: 4 :: Views: 1434
What results are you looking to get from hfss?
a) Be sure to check the current distribution. Se my posts in:
b) Do a convergence analysis by comparing s-parameters of runs with decreasing Delta-S error tolerance AND port error tolerance (if using wave ports). Do this in MWO also
Electromagnetic Design and Simulation :: 04-26-2006 13:12 :: madengr :: Replies: 1 :: Views: 3421
please tell me whether its necessary that every
solution should converge somewhere when using hfss9.2
normally i just give the solution setup then sweep
with some step size ........and then validate it and
simply run and note the results.....
i don't go in RESULTS/SOLUTION DATA/convergence and
check whether the solution gets converged somew
Electromagnetic Design and Simulation :: 04-18-2006 14:53 :: zeshan102 :: Replies: 1 :: Views: 930
I am experiencing a similar problem with hfss. I set up the simulation such that at least 5 runs converge. After a while convergence is achieved. Then in the subsequent 3-4 runs, the convergence is achieved. But suddenly at the 4th or 5th run there is an error of %98. Out of 36 runs, none of the 4 runs converged to the same value after one (...)
Electromagnetic Design and Simulation :: 04-06-2006 18:48 :: irfan1 :: Replies: 5 :: Views: 2158
Try forcing hfss to take more adaptive passes. Sometimes it shows error convergence when error convergence has not really been achieved. Sometimes, you get two adaptive passes that happen to have about the same amount of error, which can fool the convergence criteria tester to think you have achieved (...)
Electromagnetic Design and Simulation :: 11-12-2005 02:01 :: maxwellian :: Replies: 1 :: Views: 893
Yes, the waveport in hfss can have lossy dielectric and/or good (non-perfect) conductor.
my guess for your problem:
1. 2xTsub is hardly "large" enough, check convergence w.r.t. all the sizes that you set to be around 2xTsub.
2. make sure you understand the unit of the hfss answer correctly.
Electromagnetic Design and Simulation :: 09-07-2005 17:10 :: loucy :: Replies: 3 :: Views: 1732
Sorry for late reply but I haven't been using hfss for a long time. First of all it was optimized for high frequencies, so 64 MHz is too low. Recently I heard that they made modifications for lower frequencies.
Anyways, ideally all should give the same results. I would check the setup first, lumped elements are tricky. If everything looks o
Electromagnetic Design and Simulation :: 01-18-2012 05:55 :: haydar :: Replies: 12 :: Views: 9096