determine impedance of a coaxial structure with two concentric dielectrics.
dualcoax D1 D2 D3 Er1 Er2
dualcoax computes the impedaance of a dualcoaxial cable, with two
concentric dielectrics, given the outside diameter of the inner conductor D1,
the outside diameter of the inner dielectric D2, the
outside diameter of the outer dielectric (which is also the inside diameter of the
outer conductor) D3, as well as the relative permttivity of the inner
dielectric Er1 and the outer dielectric Er2.
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