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An integrated closed-form model and circuit model are used to compute the conductor thickness-dependent effective relative permittivity εeff(f, t), characteristic impedance Z0(f, t), dielectric loss αd(f, t) and conductor loss αc(f, t) of a slot line. The circuit model demonstrates dispersion at frequencies below 1 GHz. It also computes the imaginary part of Z0(f, t). The accuracy of the circuit model is tested against several full-wave methods in the frequency range 0.1-60-GHz for a conductor thickness 3-50--m. For -eff(f, t) and Z0(f, t) the average deviation is <;1.36<;, for <;c(f, t) it is 1.88% and for total loss %(f, t) it is 2.13% against the full-wave methods and EM-simulators.