  We investigate radiation of a charged particle bunch moving through a
corrugated planar conductive surface. It is assumed that the corrugation period
and depth are much less than the wavelengths under consideration. In this case,
the corrugated structure can be replaced with some smooth surface on which the
so-called equivalent boundary conditions (EBC) are fulfilled. Using the EBC
method we obtain expressions for the electromagnetic field of the bunch which
are presented in form of spectral integrals. It is demonstrated that the bunch
generates surface waves propagating along the corrugations with the light
velocity. Also we present results of numerical calculations for electromagnetic
field components of surface waves depending on coordinates and show that these
dependences can be used for determination of the bunch size.
