ECE549_M2L1

ECE549_M2L1 - M2 L1 1 NC STATE UNIVERSITY ECE549 Principles...

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M2 L1 1 NC STATE UNIVERSITY © M. B. Steer, 2001–8 ECE549 Principles of Microwave Circuits Professor Michael Steer http://www4.ncsu.edu/~mbs MODULE 2 RF Networks LECTURE 1 Transmission Lines
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M2 L1 2 NC STATE UNIVERSITY © M. B. Steer, 2001–8 Lecture Goal Develop an understanding of signal propagation on a transmission line and of the equations that describe signals. Begin with a mathematical description leading to an intuitive understanding of forward and backward traveling power waves. – Lumped element circuit model of a transmission line – Field analysis of transmission lines – Terminated lossless line and reflection
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M2 L1 3 NC STATE UNIVERSITY © M. B. Steer, 2001–8 V X Modeling Transmission Lines • Basics of a transmission line: – The important concept to note is that there is always a signal return current. Return Current I
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M2 L1 4 NC STATE UNIVERSITY © M. B. Steer, 2001–8 Equations Transmission on Lines I Suddenly apply voltage, What happens. A B Δ z Δ V = V A V B Δ V Δ z For there to be a , Q A > Q B . Therefore I must continue to increase. That is, there must be a . Δ I Δ t
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M2 L1 5 NC STATE UNIVERSITY © M. B. Steer, 2001–8 Equations Transmission on Lines I Suddenly apply voltage, What happens. A B Δ z Δ V = V A V B Δ I Δ z For there to be a , Q A > Q B . Therefore V must continue to increase. That is, there must be a . Δ V Δ t
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M2 L1 6 NC STATE UNIVERSITY © M. B. Steer, 2001–8 Signals on a Transmission Line (with finite loss) V X Coaxial Line
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M2 L1 7 NC STATE UNIVERSITY © M. B. Steer, 2001–8 Coaxial Line with Pulse V X V X a b V X t tt tttttt 1 2 3 t 456 7 8 9 V X E L E T E T E L E L E L INITIAL LINE VOLTAGES
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M2 L1 8 NC STATE UNIVERSITY © M. B. Steer, 2001–8 Pulse on a Coaxial Line V X zzzzzz z z 13 2 4 5 6 7
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This note was uploaded on 09/24/2009 for the course ECE 549 taught by Professor As during the Fall '09 term at N.C. State.

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ECE549_M2L1 - M2 L1 1 NC STATE UNIVERSITY ECE549 Principles...

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