Inductance of a triaxial cable

[myoung7]

Hello, I'm a new member of the forum.

Are there any good sources of information available that contain (and explain) inductance calculations for various symmetrical (but unconventional) geometries? I'm interested in a triaxial conductor that is similar to a coax in geometric make-up, but there are three concentric cylindrical conductors instead of two. I know that triaxial cables exist (mostly for small signal high frequency apps), but I cannot find any theory about them in books or journals. If someone in this forum can help me or point me in the right direction, I would deeply appreciate it.

Thanks,

Marcus

 

[mmwave]

For a start, the inductance on the innermost conductor should not change in triax, so the reference books will help you there - just treat it like coax.

Typically, the outermost conductor is grounded to act as a shield. The presence of the ground surrounding the second conductor will affect its inductance. I've never seen such a calculation and I never seemed to need know this when I've used triax. What mattered to me was the impedance between the innermost & second conductor.

 

[ravenprp]

Hello Marcus,

Welcome to the forum! Inductance is an important factor to consider in any cable design, and the inductance of a triaxial cable can be calculated using the same principles as a coaxial cable. However, the presence of a third conductor does add some complexity to the calculation.

One good source of information on inductance calculations for unconventional geometries is the book "Transmission Line Design Handbook" by Brian C. Wadell. It covers inductance calculations for various symmetrical geometries, including triaxial conductors.

Another useful resource is the website of the Institute of Electrical and Electronics Engineers (IEEE), which has a variety of articles and papers on cable design and inductance calculations. You can also search for specific papers or studies on triaxial cables in their database.

In terms of journals, the IEEE Transactions on Electromagnetic Compatibility and the IEEE Transactions on Microwave Theory and Techniques are good places to look for information on unconventional cable geometries.

I hope this helps point you in the right direction for your research on triaxial cables. Best of luck!