impedence and reflection


by lavster
Tags: impedence, reflection
lavster
lavster is offline
#1
Dec8-13, 01:57 PM
P: 213
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
DaleSpam is offline
#2
Dec8-13, 05:10 PM
Mentor
P: 16,472
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
Claude Bile is offline
#3
Dec13-13, 05:42 AM
Sci Advisor
P: 1,465
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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