the problem of scattering and diffraction by thin wires has been investigated by many authors promarily because the wire is one of the very few practical geometries amenable to an analytic solution. Similar analyses,though,for the coated wire or related geometries such as the finite length narrow groove have not been considered.In this paper,we employ the travelling wave model inconjunction with a Galerkin's solution of the exact integral equaion to solve for the scattering by athin perfectly conducting wire,a thin diecletrically coated wire and a finite length narrow groove in a ground pland.As usual the proposed current model consists of three weighted travelling wave components;one is associated with the current on the finite wire whereas the other two describe the reflected travelling waves froms the wire whereas terminations.For the coated wire,their coefficientsare evaluated analytically through narrow groove,an approximate impedance boundary condition is employed at the surface of the groove for constructing the integral equation involving a surface magnetic current which is then represented by the weighted sum of the three travelling wave components.The associated travelling wave coeflicients are found in terms of single intergrals which are reduced from the original quadruple intergrals by employing certain varable transformations.Several current distributionsand scattering