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Coaxial Cable Equations
Most often used braided flexible (shown at left) and solid tube semi-rigid (shown at right) types are listed here.
Click here for popular
coax cable properties
.
Coaxial Cable Chart page
Coaxial Cable Vendors page
Capacitance (C) =
Inductance (L) =
Impedance (Z
0
) =
Velocity =
%c (speed of light in a vacuum)
Cutoff Frequency =
Reflection Coefficient =
VSWR =
Peak Voltage =
, where
d =
outside diameter of inner conductor in inches
D =
inside diameter of outer conductor in inches
S =
maximum voltage gradient of cable insulation in volts/mil
ε (ε
r
) =
relative dielectric constant
K =
safety factor
f =
frequency in MHz
Cable attenuation is the sum of the conductor losses and the dielectric losses per the following equations.
ρ
r
= 1 for copper, 10 for steel
, where
d =
outside diameter of inner conductor in mm
D =
inside diameter of outer conductor in mm
ε
r
=
relative dielectric constant
f =
frequency in GHz
ρ
rd
=
inner conductor material resistivity relative to copper
ρ
rD
=
outer conductor material resistivity relative to copper
δ =
skin depth
Webmaster:
Kirt Blattenberger
, BSEE, UVM 1989