[Need Help] Using IE3D

Hi,

I'm just start to use IE3D to simulate microstrip antenna...
and I have problem on it, I hope someone here could help me...

when I tried to add probe fed, it ask of several parameters:
like its radius or number of segment. What should (best value) I should input?

when I tried input some different value on it, its simulation yield different results
in here i put radius for 0.25 and 0.5...
also I vary the maximum Meshing Freq at Basic Parameters, (vaule 3,4 and 5GHz)
its also yield significant different results

which one I sould use?and I can rely on...
and what is the best value for those parameter...

Thanks in advance...

Hi,

In Probe fed option radius indicates the radius of the probe and no of segments indicates that division of probe dia in to given no of segments. for eg if u give 6 as no of segments probe will appear as hexagon(ie dia of probe is divided in to six segments).

The higher the Meshing Frequency is, the finer a structure will be discretized. Finer meshing is preferred for higher accuracy, but it leads to increase in Simulation time.

For further clearance regarding meshing frquency and Cells per wavelength go thr section1 of Ch2 in IE3D Manual.

Thanks, but why it yield very different result...
I mean like you said finer meshing is prefered only on higher accuracy...

because when I use 2 kind ofb value for Number of segment, i.e. 0 and 20, the resonant freq on the RL plot is very different...

balaguru thavamani said:

Hi,

In Probe fed option radius indicates the radius of the probe and no of segments indicates that division of probe dia in to given no of segments. for eg if u give 6 as no of segments probe will appear as hexagon(ie dia of probe is divided in to six segments).

The higher the Meshing Frequency is, the finer a structure will be discretized. Finer meshing is preferred for higher accuracy, but it leads to increase in Simulation time.

For further clearance regarding meshing frquency and Cells per wavelength go thr section1 of Ch2 in IE3D Manual.

Click to expand...

Whenever you put the frequency range on the simulator, the Patternview waveform will be evaluated only for the given frequency points.. So if you get a resonant frequency, it is actually the sample which gives highest return loss..

If you want to evaluate the exact resonant frequency, narrow down the frequency range around the frequency you previously got.. if number of samples are sufficienly high, you will get a better and accurate estimate of the resonant frequency..

If you are taking sufficiently large number of samples , you should not get much variation in the resonant frequency..

Hope this helps..

~skygazer

one thing may affect the accuracy of predicting resonant frequency is the Automatic Edge Cells (AEC). If you do not enable AEC or the AEC parameters are too far away from the range, the results may not be converged and the resonant frequency may change with different meshings. Regards.

I'm sorry sir what do you mean by
"AEC parameters are too far away from the range" and also this statement
"the resonant frequency may change with different meshings" ?

how we can calculate the best fit AEC parameter?
and which meshing that I should use for better results?

Thanx

jian said:

one thing may affect the accuracy of predicting resonant frequency is the Automatic Edge Cells (AEC). If you do not enable AEC or the AEC parameters are too far away from the range, the results may not be converged and the resonant frequency may change with different meshings. Regards.

Click to expand...

Hi, micro_tech:

In an IE3D simulation, you are allowed to define Automatic Edge Cells (AEC). The edge cells are used to improve the simulaiton accuracy. Normally, you can set AEC Ratio from 0.05 to 0.1, depending upon the real simulation. If you define no AEC or your AEC ratio is too far away from the normal suggested value, it may decrease the simulation accuracy. More discussion can be found from the IE3D user's manual which is available from the installaiton.

Best regards,