A patch radiator has a radiator surface designed as an annular and/or frame-shaped radiator surface, extending around a recess area. The radiator surface is extended so as to transition into the lateral surfaces or lateral walls. On the lateral surfaces or lateral walls, a lateral surface radiator structure electrically connected to the radiator surface is formed. In the peripheral direction of the lateral surfaces or lateral walls, there are lateral radiator surface sections, between which electrically non-conductive recess areas are provided.