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Coaxial lines come if many forms. The most common is circle-circle, but the are also circle-rectangle, circle-bar. So here we calculated the characteristic impedance of some different forms

Circular Coaxial Line

A simple concentric circle format. Look in the advanced for an offset

Coaxial Line

Rectangular/Square Coaxial Line

The square coax is usefull for tight packaging. The advanced section considers the rectangular case

Rectangular-Square