<p>An antenna device comprises a first dielectric substrate to which a patch conductor is provided, a second dielectric substrate facing to the first dielectric substrate and having a ground conductor provided on its surface facing the patch conductor, and an electromagnetic coupling conductor extending from the surface facing the path conductor toward the first dielectric substrate. The electromagnetic conductor is not connected to the ground conductor in a DC way and electromagnetically coupled to the patch conductor. Therefore a small antenna device attachable to the windowpane of a vehicle can be provided.</p>
