Module 1b - 1/15/2009 New important topic T-Line terminated...

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1/15/2009 1 New important topic Impedance transformation. When a generator or source is connected to a transmission line, the impedance “seen” by the source is usually NOT the line impedance. At steady state, there is a reflection from the far end of the line (where there is a “load”), that modifies the ratio of V/I This has a strong impact on the amount of power transmitted to the load (either for power or information delivery) T-Line terminated in impedance Z L at z = 0 we have (0) (0) (0) (0) ( 0) ( 0) o o o o L o o o o s s z z V V e V e V V Z I I e I e I I           Since oo o VV Z II   , then Lo ZZ Voltage wave incident on terminated T-Line Rearranging, o o o L V V V  Where L is the reflection coefficient and is a measure of the impedance mismatch at the load. Reflection coefficient between a line and a load (Z L Z 0 ) L = (Z L + Z 0 ) L varies from -1 to 1 when Z L varies from 0 to ∞ L = 0 if Z L =Z 0 The load impedance
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This note was uploaded on 09/27/2011 for the course ENGINEERIN 3600 taught by Professor Victor during the Spring '11 term at Carleton CA.

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Module 1b - 1/15/2009 New important topic T-Line terminated...

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