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6. Standard lines
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Coaxial line
The coaxial line is by far the most widely used (figure 6 ). It consists of a conductive cylinder with a circular base and radius r 1 , which forms the inner conductor, and a tube concentric with the inner conductor. This tube, with inner radius r 2 , forms the second conductor. The space between the two conductors is filled with a dielectric of constants ε, µ. The dielectric is very often polyethylene, whose relative permittivity ε r = ε /ε 0 is equal to 2.25.
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Standard lines
Cable pulse transformers
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