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Electric type dyadic Green's function is derived for the full-wave analysis of shielded planar transmission line configurations. Green's dyadic components of a multilayered region are presented as a series expansion over a complete set of Helmholtz operator eigenfunctions with one-dimensional Green's functions as unknown coefficients. For the Green's functions analytically simple and uniform expressions are obtained. The Green's dyadic of the multilayered region is involved in the electric field integral formulation for overlapping reginus to construct a generalized Computational algorithm for the analysis of planar transmission lines. To validate the presented approach, several shielded planar line configurations, such as hroadside-coupled microstrip lines, bilateral finlines, and hroadside-coupled coplanar waveguides, are analyzed and calculation results are compared with available data.