ELECTRICAL PROPERTIES OF DIELECTRICS - Advanced Signal Integrity for High-Speed Digital Design - page 293

Problem 6-6. Simulate them to show that the model matches the TDR
measurements.
6-8 What is the best way to minimize losses for a given cross section of
a transmission line with constant impedance? What is the best way to
minimize losses if constant impedance is not required? Plot the voltage
magnitude versus frequency for a 10-in.-long transmission line to prove
your theory for each case.
6-9 Given the relationship between the fiber-weave and transmission-line
dimensions shown in Figure 6-31, determine the minimum angle needed
to mitigate the impedance and velocity swings caused by the fiber-weave
effect. Assume that the maximum and minimum delay cases of the
TDR measurements of Figure 6-30 correspond to the cross sections of
Figure 6-31.

Epoxy

Glass

10 mils

5 mils

10 mils 10 mils

8 mils 8 mils

Figure 6-31 Cross sections for Problem 6-9.

6-10 For the cross section shown in Figure 6-32, plot the frequency-dependent
R, L, C, G, Z 0 , and τ d from 100 MHz to 20 GHz. Assume that the surface
of the copper is specified to have a RMS tooth height of 0 . 8 µ m.

t = 1.2

5

4

e r = 3.78, tan d = 0.022 at 7 GHz

Figure 6-32 Cross section for Problem 6-10.