___________________________________________________ Principles of Transmission Lines
A shielded pair has parallel conductors separated by a solid dielectric and
surrounded by copper braided tubing. The conductors are balanced to ground.
Figure 3-Sum 4. Shielded Pair
Rigid coaxial line contains two concentric conductors insulated from each
other by spacers. Some rigid coaxial lines are pressurized with an inert gas to
prevent moisture from entering. High-frequency losses are less than with
other lines.
Figure 3-Sum 5. Rigid (Air) Coaxial Line
Flexible coaxial lines consist of a flexible inner conductor and a concentric
outer conductor of metal braid. A continuous insulating material separates
the two.
Figure 3-Sum 6. Flexible (Solid) Coaxial Lines
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