#### Useful Coaxial Line Equations

Figure 1: Flexible coaxial line

#### Useful Coaxial Line Equations

Impedance:

Cut Off Frequency:

**Symbols:**

A = Attenuation

D = Inner diameter of outer conductor
(inches)

d = outer diameter of inner conductor (inches)

ε = Dielectric Constant

ρ = Resistivity in Ω·mm²/m

f = Frequency in Hz

l = Length
(feet)

Z = Characteristic Impedance

tan δ = Loss Tangent of Dielectric

Velocity of Propagation:

(in Per Cent of the light speed)

Dielectric Loss (in dB):

Reflection Loss (in dB):

Time Delay (in ns/ft):

Capacitance (in pf/ft):