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How to calculate the power of a terminal in frequency domain study

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I am following the saw gas sensor example. When try to calculate S parameter, we need to fix the input power of the terminal and then perform a frequency domain study. I try to calculate the power from the terminal current and voltage by the equation for average AC power. But the result are not equal to the value I set to the terminal and it looks similar to the S parameter. Does my calculation give the output power? And How comsol apply the fixed power to the terminal in terms of the boundary conditions ?


2 Replies Last Post Oct 6, 2023, 9:50 p.m. EDT

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Posted: 9 months ago Sep 29, 2023, 1:07 p.m. EDT
Updated: 9 months ago Sep 29, 2023, 1:07 p.m. EDT

Hello

Are you referring to this example?

https://www.comsol.com/model/surface-acoustic-wave-gas-sensor-2129

It does not use s-parameters so I am curious what you changed or are doing? It uses electrostatics, at least that is what i see in the file. I cannot simulate the file as I don't have the mems module but I can see the setup.

What equation are you using to calculate AC power?

Hello Are you referring to this example? https://www.comsol.com/model/surface-acoustic-wave-gas-sensor-2129 It does not use s-parameters so I am curious what you changed or are doing? It uses electrostatics, at least that is what i see in the file. I cannot simulate the file as I don't have the mems module but I can see the setup. What equation are you using to calculate AC power?

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Posted: 9 months ago Oct 6, 2023, 9:50 p.m. EDT
Updated: 9 months ago Oct 9, 2023, 9:34 p.m. EDT

Hello

Are you referring to this example?

https://www.comsol.com/model/surface-acoustic-wave-gas-sensor-2129

It does not use s-parameters so I am curious what you changed or are doing? It uses electrostatics, at least that is what i see in the file. I cannot simulate the file as I don't have the mems module but I can see the setup.

What equation are you using to calculate AC power?

Yes, it is the example. I was following the steps of the veido from the link https://www.youtube.com/watch?v=FqL6NXh6kZY. I plotted the s-parameters by setting a terminal boundary with fixed power in electrostatics and performing frequency domain study.

>Hello > >Are you referring to this example? > >https://www.comsol.com/model/surface-acoustic-wave-gas-sensor-2129 > >It does not use s-parameters so I am curious what you changed or are doing? It uses electrostatics, at least that is what i see in the file. I cannot simulate the file as I don't have the mems module but I can see the setup. > >What equation are you using to calculate AC power? Yes, it is the example. I was following the steps of the veido from the link [https://www.youtube.com/watch?v=FqL6NXh6kZY](https://www.youtube.com/watch?v=FqL6NXh6kZY). I plotted the s-parameters by setting a terminal boundary with fixed power in electrostatics and performing frequency domain study.

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