FinalSp-08 - UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Scences EECS 117 Final Examination T.K

# FinalSp-08 - UNIVERSITY OF CALIFORNIA College of...

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UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Scences EECS 117 Final Examination T.K. Gustafson May 16 2008 PRINT YOUR NAME: , S.I.D. : , SIGNATURE: , Do your work on the exam. If you do use extra sheets attach these to the exam so they can be considered as well. Make your methods clear so that partial credits can be given. There are six problems Each problem will be graded out of 20.
UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Scences EEECS117, Spring 2008 Spring 2008 Final Exam : There are six questions: Number one ) Transmission Lines (Smith Chart) A lossless Z 0 = 100 Ω one meter (h = 1m) line is terminated in a load with Z L = 100+ j 50 Ω . It is excited at 30 GHz with a voltage v s = ˜ V s e iωt Take k = ω/c if needed. Use the accompanying Smith chart to find the following. Clearly indicate how you do this. a) Label with A the location of Z L /Z 0 . What is the reflection coefficient at the load , Γ L ?
b) Label with B, the location at which the standing wave ratio (S. W. R.) is obtained. What is the value of the S.W.R? c) Label with C, the location of the input impedance 0.35 λ from the load and with D, the admittance. d) Label with E, the position of the first voltage minimum from the load. e) What value of capacitance at the load which would eliminate reflections from the load?

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