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COMMUNICATION ENG. PROF. A.M.ALLAM

TUT2

V-I-Z Along Transmission line

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COMMUNICATION ENG. PROF. A.M.ALLAM

Problem1The incident voltage wave on a certain lossless transmission line for whichZ0 = 50Ω and vph =2x108 m/s is V + (z, t) = 200cos(ωt -πz) v.a) Find ωb) Find I + (z, t)The section of line for which z > 0 is replaced by a load ZL = 50 + j30Ω at z = 0. Findc) Γd) V (z)e) Vs at z = −2.2 m

Problem2A 300 ohm transmission line is 0.8 m long and is terminated with a short circuit. The line is operating in air with a wavelength of 0.3 m and is lossless. If the input voltage

amplitude is 10V, what is the maximum voltage amplitude at any point on the line?

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COMMUNICATION ENG. PROF. A.M.ALLAM

Problem3

In the shown figure, get the average power absorbed by each

resistor if

IS = 0.5

RS = 100Ω

RL = 25Ω

Problem4

Derive an expression for the standing wave ratio and the input impedance in the case

of a T.L. of length d is terminated with a load ZL.