Metamaterial antenna devices having one or more mechanical connection units made of electrically conductive materials to provide both mechanical engagement and electrical conduction for the antenna devices. The case is assembled from a first and a second half-case. The materials exhibit remanence and intrinsic coercivity values of between 7. The signal lines and the power lines are extended radially together with the underlying ground lines. As the material for the barrier metal film 110, TaN or the like is utilized. The conducting wires are electrically connected to a rear of the printed circuit board.