Learning Forum

[biswash paudel]

Hi 
I am running a simulation in HFSS 2023 R2.
My simulation consist of a 5 zigzag antenna inside a chip. 
And I got the following error.
Solving adaptive frequency ....... process hf3d exited with code 1073740791.

[Praneeth]

Hi,

Thank you for reaching out to the Ansys learning forum, your patience is much appreciated.

At what stage of the analysis this error is triggering? Please provide the details to help us serve you better. If you are trying to use HPC, then check whether you are using it within the limit allowed by your machine.

Best regards,
Praneeth.

 

[biswash paudel]

Hi Praneeth,

Thank you for your reply.

I encountered this error while simulating a chip model containing 5 antennas. Yes, I am using HPC. Could you please clarify what you mean by "using it within the limit"? I conducted the simulation on a machine equipped with 50 processors and 256 GB RAM.

[Praneeth]

Hi,

Did this occur during the adaptive passes stage of the analysis?

Please share the HPC options screenshots to help us serve you better.

Best regards,
Praneeth.

[biswash paudel]

Hi Praneeth 

Thank you for your prompt reply. 

Yes, the problem occurs during the adaptive passes. 

Please find the attached screenshot for HPC setting.

[Praneeth]

Hi,

Please use 90% of RAM and try solving the model again.

Best regards,
Praneeth.

[biswash paudel]

Hi Praneeth 

Thank you for the info. 

I will run the simulation with 90% of RAM. 

May i know what might be the reason to change from 99 to 90%?

Best regards,

Biswash Paudel

[Praneeth]

Hi Biswash,

This is a general recommendation to not load the RAM fully. 

Best regards,
Praneeth.

[biswash paudel]

Hi Praneeth,

Thank you for clearing the doubt.

I am working on a chip model with 4 layers (10x10x1.35 mm^3): copper layer, Polyimide, Aluminium Nitride, and Aluminium.

I have placed 9 zigzag antennas (0.2mm length) in the polyimide layer at equidistant positions from each other.

I am looking for a transmission coefficient. What would be the best mesh setting and speed up for this type of simulation? Could you please help with this?

 

Best regards,

Biswash Paudel 

[Praneeth]

Hi Biswash,

Did you try the HFSS 3D layout design type which is predominantly used for 3D models with small thickness like PCBs?

Best regards,
Praneeth.

[biswash paudel]

Hi Praneeth,

No I use the HFSS for the design of whole structure and define individual layers. 

 

Best regards,

Biswash Paudel

 

[Praneeth]

Hi Biswash,

It is recommended to use the HFSS 3D layout for layered structures like PCBs.

Best regards,
Praneeth.

[biswash paudel]

HI Praneeth 

Thank you for the suggestion. 

On the another note, I keep getting this kind of error on a regular simulation (just on the above metnion design after I reduce some complexities in the model).

Coud you please advise me, what trigger this error? 

 

Best regards,

Biswash Paudel

[siva bala]

hi what is the reason for getting this error and how to resolve it

 

patch antenna (C:/Users/Administrator/Documents/Ansoft/)
  HFSSDesign1 (Terminal Network)
    [error] Solving adaptive frequency ..., process hf3d exited with code -1073741795. (08:47:53 PM  Feb 25, 2024)
    [error] Simulation completed with execution error on server: Local Machine. (08:48:14 PM  Feb 25, 2024)

[Praneeth]

Hi,

Did you go through the recommendations mentioned in the thread?

Best regards,
Praneeth.

[biswash paudel]

Hi, 

Yes, I relaxed the mesh setting, decrease the frequency sweep and applied domain decomposition solution with first order of basis function. 

 

Best regards,

Biswash Paudel 

[Praneeth]

Hi Biswash,

Thank you for confirming.

Best regards,
Praneeth.