305_exam_1_s04 - (c Compute the loss in dB/m(d Compute L C...

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ECE 305 Name: Spring 2004 Exam #1 Student No. Note: Be sure to include units where appropriate! Note: YOU MUST SHOW YOUR WORK TO GET CREDIT! Note: Each problem is worth 8 points 1. Transient transmission lines. A battery is switched into a short-circuited transmission line through a series resistance, as shown below. a) Draw and label the voltage and current bounce diagrams, and use them to plot ) , 0 ( t v and ) , ( t i for 0 6 t T ≤ ≤ .
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1 continued b) Find the steady-state current, ) , ( t i , t .
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2. Transmission line parameters. A high-loss transmission line operating at 100 MHz has a characteristic impedance of 0 10 0 j Z + = Ω and a propagation constant of 10 5 j + = γ m -1 . (a) Compute the phase velocity. (b) Compute the wavelength.
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Unformatted text preview: (c) Compute the loss in dB/m. (d) Compute L, C, R, and G. 2 continued 3. Standing waves. A lossless transmission line with a characteristic resistance of 50 R = Ω is terminated by a load with impedance L Z . If the reflection coefficient is 4 . 1 . j + = Γ , a) Find S b) Find m d in wavelengths c) Find L Z 3 continued 4. Input impedance. A 2.5 cm long section of lossless transmission line of characteristic resistance 50 Ω is operated at 1 GHz and has a phase velocity 8 10 2 × m/s. a) Find the wavelength on the transmission line. b) Find the input impedance when the line is terminated with a load impedance of Ω + 50 100 j . 4 continued...
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305_exam_1_s04 - (c Compute the loss in dB/m(d Compute L C...

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