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- Thread starter nirvan25
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In summary: My problem is in solving for the series resistance. The ANSOFT MAXWELL SV documentation says to solve for it using the Laplace equation, but I am not sure how to do that. I have tried different solvers, but all of them give me different results.I have attached my ANSOFT MAXWELL SV model and the Laplace equation used to solve for the series resistance. In summary, the software is useful for calculating the series resistance of a coax cable, but it is not clear how to do it using the Laplace equation.

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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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