Standard lines
Électronique impulsionnelle

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 r₁, which forms the inner conductor, and a tube concentric with the inner conductor. This tube, with inner radius r₂, 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 /ε₀ is equal to 2.25.

• Linear constants and characteristic resistance

  Linear capacitance C is the capacitance of a cylindrical capacitor of unit height, the dielectric having permittivity ε. We...