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parametric sweep of feed position

Dear Altruist,

I hope my message will find you well.

Could you please let me know how can I do parametric sweep of my feed position and extract the result in CADFEKO v2022.3.For the time being I am using simple wire feed with 50 ohm voltage source.

It would be better if anyone could give me a link of video tutorial for that.

Thank you.

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Feko

v2022.3

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Evan_Urban

Hello,

I do not know if there is a video tutorial to help you with parametric sweep. However, if you have your model constructed and your wire feed is defined with a variable, you can select the Parametric Sweep in the Macro Library:

Here you can define the variables you want to sweep, such as your feed location. In 2022, you can select your sweep definition (I have a dipole for example in this case and choosing to sweep the radius. I can select a start value for the radius and end value, including number of samples):

Lastly, you should be able to just run the sweep and view the Parametric Sweep results in POSTFEKO.

Does this help your question? You just need to define the feed variable here in the sweep and it should run the computation for you.

Respectfully,
Evan Urban

GOLAP

Hello Evan,

Thank you for your answer.

After following instruction I can run the parametric sweep to move the feed position.

But in a window it is saying no mesh file were loaded although in my design I defined fine mesh. Please help me what to do next.

Thanking You,

Golap

Evan_Urban

Hello Evan,

Thank you for your answer.

After following instruction I can run the parametric sweep to move the feed position.

But in a window it is saying no mesh file were loaded although in my design I defined fine mesh. Please help me what to do next.

Thanking You,

Golap

Hi Golap,

That is just because multiple simulations were run and each simulation has a mesh. The mesh is a good mesh (adequate mesh is necessary in order to run the sweep), so you do not need to worry about that. When you go into POSTFEKO you can load the mesh to view if you desire, however you can now view the parametric sweep results (Can see the "The Data is stored under (Stored data)" line).

Respectfully,
Evan Urban

GOLAP

Hello Evan,

Thanks for your reply.

After running the sweep I can see the results. I am sweeping for different feed position for a frequency range of 1.4 GHz- 1.6 GHz.

Could you please help me realize where I can find out the details of which position of feeding which result.

Now I can only see only the 20 samples of S11. I want to know which position of feed point is giving me which result.

Please help.

sweep.jpg

Evan_Urban

Hi Golap,

Would you be able to share your model with me (Including the sweep parameters you would like to sweep and the values)? I can have a better understanding of your results first hand and share images to help.

Respectfully,

Evan Urban

GOLAP

Hello Evan,

Please check the attachment. My sweep parameter is V_move such I can get S11 way below -20 dB.

Thanking You,

Golap

Patch_2_Air.cfx

Evan_Urban

Hi Golap,

I finished running the simulation. For the results you can select as your trace the VoltageSource_sweep. This gives you all of the simulated results of the reflection coefficient from the parameter sweep that was performed (Top right square). With this plotted you can cycle through the various V_move values and it updates the plot to the Reflection Coefficient of that simulation (In the case I am showing -20dB at a V_move value of 10). You can view various results this way by selecting the Sweep results.

Does this help with your question?

Respectfully,
Evan Urban

GOLAP

Hello Evan,

Thank you very much.

I was looking for the the second block that you showed me( V_move option).

Thanks for your help.

Will be in touch with you for further assistance.

Thanking You,

Golap

Evan_Urban

Hi Golap,

Not a problem, feel free to reach out with any questions.

Respectfully,
Evan Urban

GOLAP

Hello Evan,

Could you please let me know how can I create Layer 2, Layer 3 and so on on top of Layer 1 rather than going below.. I tried to after giving + ve or - ve values of Z ( below). But every time it is creating below the Layer 1.

Could you please guide me how can I create the layer on top layer1 ( infinite ground plane or infinite substrate layer).

Thanking You,

Golap

Evan_Urban

Hello Golap,

What you can do is just define what you would for the top layers as Layer one. For example, just consider Layer 1 as the top and assign the appropriate thickness and material to that layer. Continue downward with Layer 2 and so on. I see you have a PEC defined for the Ground Plane in Layer 1. If you wish this ground plane at the very bottom of your substrate, just choose PEC for the bottommost layer in your creation (Set none for Layer 1 and set PEC for Layer 3 Ground Plane in the image you provided). That should give you the proper substrate.

Don't consider Layer 1 as the bottom layer, just consider it as the first layer from the top of the substrate you define.

Does this explanation help clear up your question?

Respectfully,

Evan Urban

GOLAP

Hello Evan,

Thanks for your reply.

Will give a try based on your suggestion.

I will let you know.

Thanking You,

Golap

Evan_Urban

Hi Golap,

It appears the Altair Community is restored. Have you been successful in your simulation?

Respectfully,

Evan Urban