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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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relation between two sudy

Posted 2012年7月13日 GMT-4 12:42 RF & Microwave Engineering, Acoustics & Vibrations, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers, Structural Mechanics Version 4.3, Version 4.3b 4 Replies

Sahar Simyari
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hi all,
i created a model of piezoelectric device in piezoelectric module,now i want to transfer it to electromagnetic wave module because i need S parameters(that aren't in piezoelectric answers)but when i add elctromagnetic wave and open my model in that module i see error:(
so i have a question:what do i do i can see my model in electromagnetic module?
thank alot
4 Replies Last Post 2014年7月30日 GMT-4 12:31
CatalinBotezatu
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Posted: 1 decade ago 2012年8月2日 GMT-4 08:33
Hello,

I am also experiencing some difficulties in combining the two physics.
I am building a model for a SAW device.
I tested it using the "Piezoelectric Device" physics and I was able to see the admittance and other parameters.
Now, I want to obtain the S parameters. I introduced the "Electromagnetic Waves" physics and performed
some settings for it: added the ports and periodic conditions.

I started the simulations, but the parametric solver remains stuck around 20%.
Has any of you done this kind of simulation?
Do I need to operate some settings in order to get the two physics to work together?
Am I missing something?

Thank you,

Catalin B.
Hello, I am also experiencing some difficulties in combining the two physics. I am building a model for a SAW device. I tested it using the "Piezoelectric Device" physics and I was able to see the admittance and other parameters. Now, I want to obtain the S parameters. I introduced the "Electromagnetic Waves" physics and performed some settings for it: added the ports and periodic conditions. I started the simulations, but the parametric solver remains stuck around 20%. Has any of you done this kind of simulation? Do I need to operate some settings in order to get the two physics to work together? Am I missing something? Thank you, Catalin B.
CatalinBotezatu
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Posted: 1 decade ago 2012年8月6日 GMT-4 06:11
Hello,

I am still experiencing difficulties in obtaining the S-parameters for a SAW device.
For the moment, I am only considering a piece of it to whom I apply periodic boundary conditions.
My two main problems are:

1.what type of port should I use for this?
I saw in help that is recommended to use lumped ports when the dimensions of the port are much smaller
that the wavelength. When I put lumped port, simulation works, but my S11 parameter is just a line.
If I use only Port (Rectangular or User defined), the simulation doesn't pass 0% on parametric solver.

2. Perfect electric conductor: by default, Comsol considers all boundaries as PEC.
Some of this get overridden when I choose ports and PBC.
But there are many left as PEC, which should not happen in my case. And I think this is the reason why I obtain a plane line for my S11 parameter.
How do I modify this? What should I add to my model?

I also attached my model to this message.


Thank you,

Catalin B.


Hello, I am still experiencing difficulties in obtaining the S-parameters for a SAW device. For the moment, I am only considering a piece of it to whom I apply periodic boundary conditions. My two main problems are: 1.what type of port should I use for this? I saw in help that is recommended to use lumped ports when the dimensions of the port are much smaller that the wavelength. When I put lumped port, simulation works, but my S11 parameter is just a line. If I use only Port (Rectangular or User defined), the simulation doesn't pass 0% on parametric solver. 2. Perfect electric conductor: by default, Comsol considers all boundaries as PEC. Some of this get overridden when I choose ports and PBC. But there are many left as PEC, which should not happen in my case. And I think this is the reason why I obtain a plane line for my S11 parameter. How do I modify this? What should I add to my model? I also attached my model to this message. Thank you, Catalin B.

Attachments:

Heshik Gowda
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Posted: 1 decade ago 2013年5月14日 GMT-4 05:21
I am new to the Comsol tool. Can some one help me how to calculate the S- parameter for model build using PIezoelectric material.
I am new to the Comsol tool. Can some one help me how to calculate the S- parameter for model build using PIezoelectric material.
Farrukh Mateen
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Posted: 10 years ago 2014年7月30日 GMT-4 12:31
Hello did any one get a solution to this problem

Thanks
Hello did any one get a solution to this problem Thanks

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