Twin lines - opracowanie

Twin lines We state without proof that for twin lines of the type illustrated in Figure 2.27
Again we note that the velocity is independent of frequency, and equal to velocity of
light in the medium. The characteristic impedance is
Z0 =
1
π
r
μ0
ε
loge
μ
2s
d
¶
for s À d (2.101)
Common values of Z0 are 300Ω for communication lines, 600Ω for telephone lines;
slightly higher values are found for power lines.
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