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## Convergence In Hfss |

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43 Threads found on edaboard.com: **Convergence In Hfss**

Hi vineelasri,
This sounds like a **convergence** issue. What are your **convergence** criteria? Do you have a seed mesh?
It could also be the port - what dimensions are you using? Is it a microstrip line?

Electromagnetic Design and Simulation :: 03-16-2015 11:54 :: PlanarMetamaterials :: Replies: **5** :: Views: **493**

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

Electromagnetic Design and Simulation :: 11-25-2014 09:17 :: ings :: Replies: **4** :: Views: **700**

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.

Electromagnetic Design and Simulation :: 11-25-2014 13:02 :: PlanarMetamaterials :: Replies: **2** :: Views: **866**

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.

RF, Microwave, Antennas and Optics :: 09-27-2014 18:46 :: soaringeagle :: Replies: **2** :: Views: **542**

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

Electromagnetic Design and Simulation :: 01-21-2014 10:08 :: hermit :: Replies: **2** :: Views: **673**

In your design go to Results>Solution Data. A window with differece tabs pop up. One tab is **convergence**.
There you can find **convergence**, in my opinion is easy to look for the plot.
I have to say that in the Analysis Setup I always select : Options>Adaptative Options>Minimum Converged passes: 2. (Maybe it is by default)

RF, Microwave, Antennas and Optics :: 11-07-2013 07:50 :: svia :: Replies: **7** :: Views: **364**

Help !!!!
Hi,
I simulated a narrow band cavity filter around 20 GHz. Geometry is very simple ; no curve, no imported object, all faces straight, no exotic material....I've optimized my Bandpass filter's response with **hfss** version 11. **convergence** is very fast with a simple setup (Delta S =0.02 , min passe = 15 --> 10.000 tetraedra last adaptive

Electromagnetic Design and Simulation :: 10-24-2013 03:35 :: Tucco :: Replies: **1** :: Views: **677**

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

Electromagnetic Design and Simulation :: 10-11-2013 23:17 :: jianke :: Replies: **0** :: Views: **558**

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

Electromagnetic Design and Simulation :: 09-29-2013 21:07 :: aniakhan :: Replies: **3** :: Views: **547**

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?

Electromagnetic Design and Simulation :: 04-23-2013 20:19 :: xyz1380 :: Replies: **0** :: Views: **472**

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 12:45 :: abhisheksarkhel :: Replies: **3** :: Views: **785**

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

RF, Microwave, Antennas and Optics :: 06-07-2012 03:04 :: kartikkhurana :: Replies: **2** :: Views: **640**

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 17:40 :: DeboraHarry :: Replies: **0** :: Views: **867**

There are four different design's that are mentioned in the tutorial,and there are some errors as well that have to be fixed in this tutorial
coming to your question.**convergence** is The criteria of **hfss** is based on S-parameter at the ports. S-parameter is the integration of field intensity on the port surface. So, S-parameter is considered converge

Electromagnetic Design and Simulation :: 01-19-2012 08:59 :: elchiquito :: Replies: **5** :: Views: **1170**

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

Electromagnetic Design and Simulation :: 12-19-2011 14:08 :: venu.gongal :: Replies: **2** :: Views: **1546**

for most applications ΔS=0.02 is quite adequate. Decreasing the ΔS will result in a more complex mesh and more simulation time.
Maximum number of passes of about 6 to 15 is enough.
You can see the **convergence** data of your design by right clicking on the setup in project manager and selecting "**convergence**" from the pop-up menu. If it has

Electromagnetic Design and Simulation :: 10-16-2011 06:42 :: amihomo :: Replies: **2** :: Views: **778**

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 10:37 :: kmmaran :: Replies: **5** :: Views: **1682**

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

RF, Microwave, Antennas and Optics :: 12-10-2010 06:49 :: ahsaan :: Replies: **2** :: Views: **3722**

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 12:36 :: pir0texnik :: Replies: **0** :: Views: **1041**

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 11:34 :: mac.feri :: Replies: **1** :: Views: **2804**

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 11:10 :: streamlet :: Replies: **1** :: Views: **777**

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 (...)

Electromagnetic Design and Simulation :: 04-15-2010 13:12 :: mankan :: Replies: **0** :: Views: **1258**

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

Electromagnetic Design and Simulation :: 01-12-2010 03:21 :: Chourizo :: Replies: **0** :: Views: **918**

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 :: 10-20-2009 22:41 :: katko :: Replies: **3** :: Views: **2078**

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

Electromagnetic Design and Simulation :: 02-16-2009 08:20 :: Heikoo :: Replies: **0** :: Views: **1442**

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 16:00 :: rfmw :: Replies: **2** :: Views: **6750**

Yes, **convergence** is not an issue. I believe that the way the phase is handled by the simulator might be the problem.

Electromagnetic Design and Simulation :: 09-22-2008 15:02 :: famale :: Replies: **2** :: Views: **877**

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

Electromagnetic Design and Simulation :: 07-30-2008 10:25 :: kt302 :: Replies: **0** :: Views: **1090**

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

Electromagnetic Design and Simulation :: 07-12-2008 04:13 :: wlcsp :: Replies: **2** :: Views: **1497**

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.

Electromagnetic Design and Simulation :: 06-02-2008 04:32 :: wlcsp :: Replies: **1** :: Views: **906**

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

Electromagnetic Design and Simulation :: 05-30-2008 04:26 :: wlcsp :: Replies: **4** :: Views: **971**

Hi freek,
first your simulation is not converged, you should change your number of passes to 10 or 20 (I tried a good point at 12) for the **convergence** of simu,
second you have not the plan of mass, I think that it is better to add it ..

Electromagnetic Design and Simulation :: 05-31-2007 06:19 :: cuongtran :: Replies: **3** :: Views: **1083**

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 09:12 :: madengr :: Replies: **1** :: Views: **3188**

please tell me whether its necessary that every
solution should converge somewhere when using **hfss**9.2
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 10:53 :: zeshan102 :: Replies: **1** :: Views: **815**

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 14:48 :: irfan1 :: Replies: **5** :: Views: **1914**

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 13:10 :: loucy :: Replies: **3** :: Views: **1546**

check the **convergence** in matrix data whether it is converged first;
try to reduce the **convergence** criteria and re-run the simulation again;
the difference of simulated S11, what kind of difference is it? for example, whether all the resonance are still there? whether the resonant frequency shifted? If only the magnitude of resonace different, mos

Electromagnetic Design and Simulation :: 06-09-2005 02:48 :: asdfaaa :: Replies: **12** :: Views: **7751**

Hi,
I think you might have problems with plane wave excitation. Try to use the solver view option from **hfss**, to ensure that plane wave excitation is not overridden by other boundaries. also chek for **convergence** (let the minimum converged paths be 2 or 3).
BR
Adel_48

Electromagnetic Design and Simulation :: 04-12-2005 01:13 :: adel_48 :: Replies: **1** :: Views: **1571**

hi
itaifrenkel posted a message below. it would help:
**hfss** using **convergence** in order to get an accurate solution. After creating an initial mesh it starts doing adaptive passes until the desired error residual is achieved. In each stage it refines the mesh and resolves the problem. The resulting S-Matrix is compared to the previous one. The ma

Electromagnetic Design and Simulation :: 11-10-2004 10:37 :: haydar :: Replies: **1** :: Views: **2193**

Hi guys,
The time domain has an inherent limitation. In order to reduce the time step it needs to refine the grid (and the other way around).
I recommend to test Ansoft **hfss** which uses Finite Element Analysis. Not only that it has no refinment problems, but also you can control the accuracy of the **convergence** process. In pr

Electromagnetic Design and Simulation :: 11-03-2004 15:31 :: eirp :: Replies: **5** :: Views: **1233**

the simulation will terminate when either of these 2 criteria is met.
if you set the maximum number of passes to 6 and the model does not converge within 6 passes the simulation will stop regardless.
the maximum delta s defines the **convergence** criteria, if you use 0.02 it means that when the difference between two passes is less than 2% th

Electromagnetic Design and Simulation :: 09-27-2004 07:25 :: Matt :: Replies: **4** :: Views: **2252**

about the **convergence** message in **hfss** v9.0 :()
1. why the 6th and 8th pass gave Delta S in terems of N/A? what does N/A mean?
2. it seems Delta S becomes larger when pass Numbers increasing, I don't know if it's reasonable since I feel Delta S should get smaller with increasing pass Numbers solved.
Thanks in advance!
the next is a

Electromagnetic Design and Simulation :: 05-23-2004 21:26 :: jackle :: Replies: **2** :: Views: **1002**

If you first do the **convergence** analysis for a single frequency, the mesh used in the final pass is recorded.
There is an option for the mesh used in the frequency sweeping. Choose "current mesh"(?), then the sweep will be done with the mesh recorded above.

Electromagnetic Design and Simulation :: 01-23-2003 20:55 :: loucy :: Replies: **1** :: Views: **2958**

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