closed form expressions for the Green's functions of a planar microstrip structure on an electrically thin uniaxially anisotropic substrate have been derived. The approach is to first obtain the quasi-dynamic term and refine its accuracy with a correction term valid for higher frequencies. The quasi-dynamic term conveys the influence of partial images and includes both transverse and vertical dielectric constants ε_(rt) and ε_(rz). The correction term, on the other hand, results in an expression that includes ε_(rz) only. Results indicate excellent agreement with exact numerical solution over a significant band of frequencies and over a large range of spatial values.
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