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RF Module Antenna Calculation
Posted 2025/03/03 22:28 GMT-5 Electromagnetics, RF & Microwave Engineering Version 6.3 3 Replies
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Hello, I would like to ask for some advice. I am currently using the Electromagnetic Waves, Frequency Domain (RF Module) to build an antenna, with the frequency range set to 0.7 GHz - 5.1 GHz and a step size of 0.6. The calculation process is very slow, but it eventually results in an error. I hope that the S11 parameters and voltage standing wave ratio (VSWR) of this model can be calculated up to 5.0 GHz and above, and I also need to observe whether the S11 parameter values are less than -10. I previously consulted with you and received your response, and indeed, I made a mistake. After recalculating according to the solutions you provided, the error still persists. The error message is: "Feature: Stationary Solver 1, failed to find a solution. The linear iteration diverged. The returned solution does not converge. Not all parameter steps were returned." Could you please tell me what might be causing this? Is it an issue with the model? How can this problem be resolved? Thank you very much for your assistance!
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Do you have a version of your .mph file in English?
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
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Hello, I have re-uploaded the English version of the .mph file. My issue is as follows: I am currently using the Electromagnetic Waves, Frequency Domain (RF Module) to construct an antenna, with the frequency range set from 0.7 GHz to 5.1 GHz, in steps of 0.6. The computation process is very slow, and eventually, an error occurs. I hope that the S11 parameter and the Voltage Standing Wave Ratio (VSWR) of this model can be calculated up to 5.0 GHz and above, ensuring that the S11 parameter value is less than -10. I previously consulted with you and received your reply, and indeed, I was mistaken. After recalculating according to the solution you provided, the error still persists. The error message is: "Feature: Stationary Solver 1, Failed to find a solution. Linear iteration diverged. The returned solution has not converged. Not all parameter steps have been returned." Could you please tell me what might be causing this? Is it a problem with the model? How can this issue be resolved? Thank you very much for your assistance!
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I approximately halved the mesh size and switched the Analysis Methodology from Fast to Intermediate. It solved in 2 min at the highest frequency.
(added note: actually it was the mesh size that made the difference, not the Methodology. I have seen this behavior before where a mesh size too large refuses to converge. I assume this is because some details of the field cannot be represented with the larger mesh size. Also: it looks like this problem can be reduced by one quarter using symmetry).