This page covers the capacitance of
Coaxial Cable and Cylindrical Capacitors because both consist
of a circular conductor, inside another circular conductor.
The difference is that Coaxial Cable usually has a center conductor
that is made up of solid or stranded wire and a solid dielectric material.
The Cylindrical Capacitor, on the other hand, could be a hollow center
conductor and has air as a dielectric.
Knowing the capacitance of coaxial
cable is useful when you are trying to make coaxial antenna traps
where the cable provides both the inductance and capacitance. Building
a capacitor from two different sized copper pipes might be useful
as a capacitor in a antenna matching section.
Below are some simple calculations
to determine the effective capacitance for Coaxial Cable and
Cylindrical Capacitors.
In the appropriate boxes, enter the required data
and then click your mouse outside the entry area. Output
can be displayed in US/Imperial or Metric measurement units.
C = capacitance in pF/ft
K = dielectric constant
D = ID of outer conductor
d = OD of inner conductor
Unit Mult = 24.147 (Metric), 7.36 (U.S.A/Imperial)
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Enter the Outside Diameter (AWG, in, cm, or mm) of the inner conductor. (d)
Enter the Inside Diameter (in, cm, or mm) of the outer conductor. (D)
Select the Dielectric Constant
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