ECE-305-Lecture22

# ECE-305-Lecture22 - Engineering Electro-Magnetics...

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Unformatted text preview: Engineering Electro-Magnetics Engineering Electro-Magnetics ECE-305, Lecture 22 Dennis McCaughey, Ph.D. 13 April, 2010 04/13/2010 Dennis McCaughey, ECE305, Spring 2010 2 Homework Homework Due April 20 11.1, 11.8, 11.19 04/13/2010 Dennis McCaughey, ECE305, Spring 2010 3 Transmission Lines Transmission Lines Characterized by the connection between two electrical devices that are separated by distances on the order of a wavelength or much larger When distances are sufficiently large time delay becomes appreciable. – Phase delays – Wave propagation similar to that in free space Basic circuit elements (resistors, capacitors, inductors) are considered lumped parameters if the time delay is negligible Circuit elements are considered as distributed if the time delay is appreciable 04/13/2010 Dennis McCaughey, ECE305, Spring 2010 4 Basic Transmission Line Circuit Basic Transmission Line Circuit When switch is closed V propagates down the line with velocity v Dotted line represents the wave front as voltage pulse travels (no voltage to the right) Current is flowing to the left of the dotted line Some voltage will be reflected at the resistor and sent back across the line 04/13/2010 Dennis McCaughey, ECE305, Spring 2010 5 For a lossless transmission line the wave propagation velocity will be shown to be: Lumped Element Model Lumped Element Model Lossless Lossless v LC = 04/13/2010...
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ECE-305-Lecture22 - Engineering Electro-Magnetics...

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