Aircraft fuselage structures have fuselage bulkheads in which the bulkhead outer caps are integrated with the skin, thereby reducing fastener count and weight. A third doping region of the first conductivity type is formed in an upper portion of the second doping region. An air guiding element is mounted in front of the base and has a continuous front wall covering the front of the base and is spaced apart from the floor on which the base stands. The one or more graphene capacitors can be configured to provide for smoothing of the signalling provided to the output.