ECE 107: Homework 2
1)
Why is it impractical to have a coaxial cable with a characteristic impendence Z
0
=500
Ω?
.
Is it
possible for a twowire line?.
In both cases assume a lossless TL and a
ε
r
=1.
2)
Calculate an approximate square wave assuming the first four Fourier components.
Assume that
the after transmitting through a line that there is a frequency dependent attenuation factor.
The
fundamental frequency (
ω
) is attenuated 10%, the second component (3
ω
) is attenuated 30%, the
third component (5
ω
) is attenuated 50% and the fourth component (7
ω
) is attenuated 70%.
Calculate the resulting wave form.
Now assume that there is no attenuation but there is a frequency
dependent velocity such that after transmission that the second component (3
ω
) is phase lagged 60
degrees, the third component (5
ω
) is phase lagged 120 degrees and the fourth component (7
ω
) is
phase lagged 180 degrees from the fundamental.
Calculate the resulting waveform.
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 Spring '07
 fullterton
 10%, 5 cm, Transmission line, 1mm, 2cm, 4 mm

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