4. The method of identifying complex permittivity of transmission line dielectric by executing computer-executable instructions stored on a nontransitory computer-readable medium of claim 3 , wherein the geometry of the cross-section and conductor parameters including bulk resistivity and roughness must be known and both segments are equipped with either coaxial connectors or conductive probe pads to measure S-parameters over a given frequency range; and wherein the said transmission line segments may be one or multi-conductor strip or micro-strip line, coplanar waveguide or any other line type.
3. The method of identifying complex permittivity of transmission line dielectric by executing computer-executable instructions stored on a nontransitory computer-readable medium of claim 2 , wherein the said transmission line segments include at least two transmission line segments with substantially identical cross-section filled with investigated dielectric and the said two transmission line segments must have different length; wherein one said transmission line segment is shorter and another said transmission line segment is longer.