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- Thread starter nirvan25
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vk6kro

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This is for air-cored coax cable :

Z = 138 log ( D / d )

where Z is the characteristic impedance

log is the log to the base 10

D is the inside diameter of the outer conductor

d is the outside diameter of the inner conductor.

D and d must be in the same units as each other.

.................eg if D / d = 5 then Z = 96 ohms

The characteristic impedance does not depend on length but is a property of the cable.

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Use Ansoft Maxwell SV to determine the series resistance, conductance, capacitance, inductance and Ac resistance of a coaxial cable by building a simple geometric model and simulating it with different solvers. The cable is RG58.

All the relevant values used for the software were obtained from the RG58 spec sheet.

I have found the conductance, inductance and capacitance using the electrostatic and magnetostatic solvers. My geometry consists of 3 concentric circles, a core ( tinned copper - 0.37" diameter), a dielelectric(foam polyethylene of 0.114" diameter) and the shield or braid( tinned copper diameter - 3.32mm).

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