A module unit includes a carrier substrate and an antenna substrate. The carrier substrate at least includes an embedded chip and a redistribution layer arranged on the first main surface. The antenna substrate including a base material includes an antenna structure arranged on the side of the first main surface, and a cavity introduced on the side of the second main surface, the cavity being aligned with the antenna structure at least in areas. The antenna substrate is connected with the second main surface to the first main surface of the carrier substrate, so that the antenna substrate and the carrier substrate form a layer stack.