EDN, October 3rd, 2002
FOR A HYPOTHETICAL, 150-MICRON (6-mil), 50[OMEGA] FR-4 stripline, Figure 1 illustrates the relative influence of skin-effect and dielectric losses on the characteristic impedance of a lossy transmission line. The chart depicts the characteristic impedance of a trace with only skin-effect and dc-resistive losses (assuming a perfect dielectric), a trace with only dielectric losses (assuming zero resistance), and a combination of both.
[FIGURE 1 OMITTED]
The topmost three curves in each case show the real part of impedance, and the bottom three curves show the imaginary part. Compared with a ...
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