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How can I calculate absolute value of scattered power
Posted 20 feb 2012, 12:44 GMT-5 RF & Microwave Engineering Version 3.5a 2 Replies
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Hi,
I just posted one question about this. However, perhaps the post is not clear enough.
All I want to do is to calculate the absolute value of scattered power, through far field obtained with far-field postprocessing. This should be a standard problem. However, I really don't figure out how COMSOL gives a constant (with respect to distance) value for far field, which should depend on distance.
Does any body know about this issue? Thanks!
I just posted one question about this. However, perhaps the post is not clear enough.
All I want to do is to calculate the absolute value of scattered power, through far field obtained with far-field postprocessing. This should be a standard problem. However, I really don't figure out how COMSOL gives a constant (with respect to distance) value for far field, which should depend on distance.
Does any body know about this issue? Thanks!
2 Replies Last Post 20 feb 2012, 20:06 GMT-5
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Posted:
1 decade ago
First of all, if all you want is the *total* scattered (or radiated) power (again that's total power, not some particular power density), then you really shouldn't use the far-field routines at all. Just integrate the normal component of power density over a surface that surrounds your radiating (or scattering) object.
Now, if you want to better understand how to interpret or manage far-field power patterns and gain in terms of power density, you will likely find the following post of interest:
www.comsol.com/community/forums/general/thread/20515/
See also: www.comsol.com/community/exchange/192/
Now, if you want to better understand how to interpret or manage far-field power patterns and gain in terms of power density, you will likely find the following post of interest:
www.comsol.com/community/forums/general/thread/20515/
See also: www.comsol.com/community/exchange/192/
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Posted:
1 decade ago
Hi, Robert!
Thanks so much for your reply!
It really helps. Now I think far field is not necessary for my case. But as for the particular way COMSOL treats far field, it is nice to read your classic post.
Thanks so much for your reply!
It really helps. Now I think far field is not necessary for my case. But as for the particular way COMSOL treats far field, it is nice to read your classic post.