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## Poor Convergence |

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convergence , convergence problem , convergence transient , convergence issues

11 Threads found on edaboard.com: **Poor Convergence**

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 :: 10.12.2010 06:49 :: ahsaan :: Replies: **2** :: Views: **2265**

I am getting following error in one of my simulation-
Fast sweep setup, process hf3d: **poor** **convergence** in computing port dispersion
I require help to understand the following-
1)What is port dispersion?
2)How it effects the result?
3)How to correct it?
Thanks
Abhishek

Electromagnetic Design and Simulation :: 27.02.2012 02:20 :: abhisheksarkhel :: Replies: **0** :: Views: **964**

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 another.

Electromagnetic Design and Simulation :: 06.04.2006 14:48 :: irfan1 :: Replies: **5** :: Views: **1500**

Anyone knows the term of 'non-converged solutions' and 'meshing' in HFSS? What does it mean by '**poor** meshing'? How to measure how **poor** it is and then how to improve it?
Thanks so much
zahril
You can read a book: Swanson D., Hoefer W., Microwave Circuit Modeling using Electromagnetic Field Simulation, 2003
There

Electromagnetic Design and Simulation :: 15.06.2007 01:39 :: borich_03 :: Replies: **3** :: Views: **894**

My work is on implicit FDTD method which allows time step (delta_t) above CFL limit. Implicit methods require one to solve a large sparse matrix. If delta_t is increased the the solution of this sparse matrix becomes slower. I can see this when I do the simulation with the implicit scheme.
But my query is about mathematical explanation of what

Mathematics and Physics :: 23.07.2009 13:17 :: confi999 :: Replies: **0** :: Views: **860**

My work is on implicit FDTD method which allows time step (delta_t) above CFL limit. Implicit methods require one to solve a large sparse matrix. If delta_t is increased the the solution of this sparse matrix becomes slower. I can see this when I do the simulation with the implicit scheme.
But my query is about mathematical explanation of what h

Electromagnetic Design and Simulation :: 23.07.2009 13:35 :: confi999 :: Replies: **2** :: Views: **979**

I use CST MICROWAVE STUDIO 2008....
(sorry .. my english is **poor**)
There is a aperture of nano-size on the surface of the metal(gold) and we
emission the plane wave foward to the aperture and observe the Power flow distribution.
(frequency : 309Thz , wavelength : 970nm )
This is what I simulate now...
Not error is occured but the re

Electromagnetic Design and Simulation :: 03.11.2009 01:01 :: happytgt :: Replies: **0** :: Views: **1156**

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?

Electronic Elementary Questions :: 24.10.2010 11:34 :: mac.feri :: Replies: **1** :: Views: **2155**

hi, ansoft guies:
There is one simple question about HFSS.
Since Adaptive 'Single frequency' analysis will allow users to setup 'Requested Passes', what number will be suitable? I used 7.
However, issues come up! The results,obtained by 'Single Frequency', differs greatly from 'Sweep' analysis
results? Because of the higher acc

Electromagnetic Design and Simulation :: 23.01.2003 10:49 :: mike_bihan :: Replies: **1** :: Views: **2399**

Two comments:
- You can't drive a NMOS-FET this way. It needs 5 to 10 V Vgs to turn it on. Switchers with NMOS output stage
typically use a bootstrap circuit to drive the FET. Consult existing circuit examples.
- A buck converter with unregulated PWM gives very **poor** output voltage stability. With no load, the output voltage
rises up to the

EDA Jobs :: 22.12.2009 03:17 :: FvM :: Replies: **8** :: Views: **2151**

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 :: 28.09.2012 12:45 :: abhisheksarkhel :: Replies: **3** :: Views: **495**

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