RF Cafe - Coaxial Cable Equations Formulas

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Coaxial Cable Equations

Flexible braided coax coaxial cable drawing

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.

Semi-rigid coax coaxial cable drawing

Coaxial Cable Chart page Coaxial Cable Vendors page

Capacitance (C) = Inductance (L) = Impedance (Z₀) = 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
		e (e_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. r_r = 1 for copper, 10 for steel	, where	d =	outside diameter of inner conductor in mm
		D =	inside diameter of outer conductor in mm
		e_r =	relative dielectric constant
		f =	frequency in GHz
		r_rd =	inner conductor material resistivity relative to copper
		r_rD =	outer conductor material resistivity relative to copper
		d =	skin depth

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