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Hfss Convergence

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59 Threads found on Hfss Convergence
hey there, what can i do, besides increassing maximum number of passes and decressing maximum delat energy to get more accurate results? thank you
hi 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
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
Hi guys 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. 125787 Substrate is FR4 (relative permittivity 4.5) and all dimentions described in the paper: Ultr
Hello everyone, I am interested in finding the field distribution inside a large resonant cavity at the resonant frequency. I can successfully simulate the cavity near the resonant frequency and use interpolating sweeps to zero in on the exact resonant frequency. Because the Q factor is so high (simulated at over 10,000), the sweep must necessar
Hi there! 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
Hi everyone, 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
Hi vineelasri, 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
Hello, 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
Hi sandbo, 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.
Hi , 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. Thanks.
hello 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
Hi all, 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
Take into account that in ADS Momentum Ground plane is infinite,not the same in hfss, so as jeedur says, a difference is expected.
simple, try it in CST time domain solver, the you know which hfss version is more reliable.
Hi everyone, 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 Maximum Refin
hi 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
Hi, 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?
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
Hi all 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 katik
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
hi all 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 regards kartik Do you want tutorials on hfss or CST
Hi 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. Thanks Venu
Hi, 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 :) DYL
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 (...)
Hello, 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
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
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?
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.
Hello 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 (...)
Hi guys, 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
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.
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
Hello, Can anybody upload(again) the CST and hfss project files for the Sievenpiper's structure? Thanks kato01
Hello, 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
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).
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? Thanks
Hi all! 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. Bye
Hello, 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
Dear all, 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. thanks.
Dear all, 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
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?
my hfss is not currently working. you can also ask at
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,
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
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
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 (...)
Dear abhi_kolkata: 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 (...)
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.
Hi Guys 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