"Dr. Barry L. Ornitz" wrote in news:2BoIl.67540
:

Since we are getting rather far away from antennas and transmission
lines, I will give references rather than discuss this here.

Well, we all like Distortionless Lines, almost all ham discussion and
indeed much if not most textbook discussion is about one special case of a
Distortionless Line, the Lossless Line.

Nevertheless, we apply one property of Distortionless Lines to real lines,
the property that Zo=Ro+j0, and that Zo is independent of frequency.

But, a real Distortionless Line (real excludes Lossless) doesn't have much
application for us.

Though I haven't had my hands on a Distortionless Line, it occurs to me
that increasing L/m is a means of diminishing the effect of changing R/m,
making G/m higher is another means of making Zo real, and if the materials
make R/m(f) track G/m(f) closely ... then the problem is mostly solved.

Owen