Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
FBAR model
Posted 2 ott 2013, 16:59 GMT-4 Acoustics & Vibrations Version 4.3a 2 Replies
Please login with a confirmed email address before reporting spam
Hi,
I'm trying to build a simple model of a Thin film bulk acoustic wave resonator. I followed an example and built one myself. However, my own model somehow gave a different result (impedance) from the example which I could not figure out why.
This is the example model
mega.co.nz/#!NohEjJhQ!aZOcDSYvL4pof__tYallazWXM8Y9LWbuOTn8pl_8Qz8
and my own one
mega.co.nz/#!wsoHEYxY!Dx8YoWK2x3hMs8n7OklIeR4XDbMW4jjgVBPzXDD4mAQ
Can anyone please help me with this?
Regards,
Ngoc
I'm trying to build a simple model of a Thin film bulk acoustic wave resonator. I followed an example and built one myself. However, my own model somehow gave a different result (impedance) from the example which I could not figure out why.
This is the example model
mega.co.nz/#!NohEjJhQ!aZOcDSYvL4pof__tYallazWXM8Y9LWbuOTn8pl_8Qz8
and my own one
mega.co.nz/#!wsoHEYxY!Dx8YoWK2x3hMs8n7OklIeR4XDbMW4jjgVBPzXDD4mAQ
Can anyone please help me with this?
Regards,
Ngoc
2 Replies Last Post 7 ott 2013, 08:57 GMT-4
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi,
The difference is that in your model, you've included the mechancial and electrical losses in the electrodes. This is not included in the example model and will for sure alter the admittance of the resonator.
Best regards
Bertil Nistad
COMSOL
The difference is that in your model, you've included the mechancial and electrical losses in the electrodes. This is not included in the example model and will for sure alter the admittance of the resonator.
Best regards
Bertil Nistad
COMSOL
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi, Bertil
Thank you for answering me. I tried modifying the isotropic structural loss of the electrode in the example model to the same value as in my model, but the result seems to be unchanged. I found some websites, and they said something about the piezoelectric material plane which can cause the unexpected low impedance in my model. However, I didn't see any difference in material plane between two models. Is there any chance that I missed something when checking this?
Regards,
Ngoc
<Newbie in COMSOL>
Thank you for answering me. I tried modifying the isotropic structural loss of the electrode in the example model to the same value as in my model, but the result seems to be unchanged. I found some websites, and they said something about the piezoelectric material plane which can cause the unexpected low impedance in my model. However, I didn't see any difference in material plane between two models. Is there any chance that I missed something when checking this?
Regards,
Ngoc
<Newbie in COMSOL>