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Module 1b - New important topic T-Line terminated in...

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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 o o o o o V V Z I I , then o o L o o o V V Z Z V V Voltage wave incident on terminated T-Line Rearranging, L o o o o L o L Z Z V V V Z Z   Where L is the reflection coefficient and is a measure of the impedance mismatch at the load.
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