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Impedence and reflection

by lavster
Tags: impedence, reflection
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lavster
#1
Dec8-13, 01:57 PM
P: 214
why does a change in impedance causes reflection? I know that R=(Z2-Z1)/(Z1+Z2), but what is it that makes the wave be reflected?

thanks
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DaleSpam
#2
Dec8-13, 05:10 PM
Mentor
P: 16,943
Basically it comes from energy conservation. At an interface of difference impedances not all of the energy will be transmitted beyond the interface. Since energy must be conserved, whatever is not transmitted must be reflected.
Claude Bile
#3
Dec13-13, 05:42 AM
Sci Advisor
P: 1,472
An alternate, but equivalent explanation to Dale's, is that reflection occurs so as to satisfy the boundary conditions at the interface.

Claude.


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