Unformatted text preview: 6.5. The inner conductor of the transmission line shown in Fig. 6.12 has a square cross—section
2a >< 2a, while the outer square is Ba x 5a. The axes are displaced as shown. (a) Construct
a good—sized drawing of the transmission line, say with a = 2.5 cm, and then prepare a
curvilinear—square plot of the electrostatic ﬁeld between the conductors. (b) Use the map to
calculate the capacitance per meter length if e = 1.660. (c) How would your result to part b change if a = 0.6 cm? a) Our attempt at the plot is shown below. Some improvement is possible7 depending on
how much time one wishes to spend.
b) From the plot, the capacitance is found to be 16x2 C = 4 (1.6)60 = 12.860 i 110 pF/m c) If a is changed, the result of part b would not change, since all dimensions retain the same
relative scale. Cl... I‘
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- Fall '08
- Electrical Engineering