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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=60-j30 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 loss-less 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 cross-section. 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
- Transmission line, Impedance matching, Standing wave ratio, Standing wave, 8mm