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Unformatted text preview: Assignment #5 1 50Ω a. b. c. d. 2. a. b. c. A signal is attenuated by .02 dB for every meter travelled on a distortionless transmission line. If this line has a capacitance of 80pF/m, find R L G vp A lossless 100 Ω transmission line is terminated by 200 + j200 Ω. Find voltage reflection coefficient Impedance at 0.375λ from load shortest length for which impedance is purely resistive, and its value. 3. A load ZL is connected at one end of the transmission line and its input impedance is measured using impedance bridge that’s gives Zin=60j30 Ω. The experiment is repeated twice with load replaced first by a short circuit and then by an open circuit. These data are recoded as j10Ω and –j250Ω respectively, find a. Characteristic impedance b. Load impedance. 4. A lossless transmission line is terminated by an impedance equals to half of its characteristic impedance Z0.Show that the input impedance is Zin=Z0√[(1+4tan2βl)/(1+tan2βl)] where β=ω√LC. 5. Derive an expression for the capacitance of a two wire pair transmission line. Plot the dependence of capacitance on D/2a for values of 1 to 5. Assignment 6
October 2, 2009 1. The following characteristics have been measured on a lossy transmission line at 100MHz Z0 = 50 + j 0Ω; α = 0.01dB/m; β = 0.8π
Determine R,L,G and C for the line 2. A transmission line constructed from perfect conductors and an air dielectric is to have an maximum dimension of 8mm for its crosssection. The line is to be used at high frequencies. Specify the dimension if it is (a) a two wire line with, (b) a 3. A Z0 = 300Ω; 72Ω coaxial fhaving a zero thickness outer conductor line is terminated in a load impedence 75Ωlossless ZL = RL + jXL . (a) What must be the relation between RL and XL in order that the standing wave ratio on the line be 3? (b) Find XL , If RL = 150Ω (c) Where does the voltage minimum nearest to the load occur on the line for Part (b)? 1 ...
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 Spring '10
 Ujin
 Transmission line, Impedance matching, Standing wave ratio, Standing wave, 8mm

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