Abstract
We have studied the subpicosecond propagation characteristics of indium coplanar transmission lines. As the transients propagated along the striplines, they exhibited stretched rise time, increased pulse width, and entry of a ringing component. In addition, we observed a “pulse sharpening” for the first time at short propagation distances. It was found that these results could not be fully accounted for by invoking the Mattis-Bardeen theory of microwave conductivity alone. Rather, the predominant effect was due to modal dispersion resulting from the dielectric mismatch at the transmission line and substrate interface. Theoretical results are successfully compared with the experimental findings.
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