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attenuation

Posted 23.03.2011, 10:15 GMT-4 3 Replies

M R
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Hi

How could I define attenuation(dB/meter) in wave propagation in PDE module of comsol ?

cheers
3 Replies Last Post 25.03.2011, 07:03 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 24.03.2011, 03:04 GMT-4
Hi

what do you mean ?

to plot

20*log10(myVar)

or to find the expression of myVar ?

--
Good luck
Ivar
Hi what do you mean ? to plot 20*log10(myVar) or to find the expression of myVar ? -- Good luck Ivar
M R
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Posted: 1 decade ago 25.03.2011, 04:30 GMT-4
Hi,

Thank you for your reply? I mean how could I enter attenuation in system? what is myvar and how could I obtain it?

cheers,
Hi, Thank you for your reply? I mean how could I enter attenuation in system? what is myvar and how could I obtain it? cheers,
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 25.03.2011, 07:03 GMT-4
Hi

"myVar" is just a quick name I use to represent any "user" variable. In your case you must then define
myVar = attenuation.

For me attenuation is model dependent, ie. could be the ratio of the integral of the input field to the output field, or the ratio of the values at two locations ...

--
Good luck
Ivar
Hi "myVar" is just a quick name I use to represent any "user" variable. In your case you must then define myVar = attenuation. For me attenuation is model dependent, ie. could be the ratio of the integral of the input field to the output field, or the ratio of the values at two locations ... -- Good luck Ivar

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