Luminaire having a data transmission function

A luminaire, having:

• at least one illuminant (6),
• a metallic luminaire housing (1), and
• at least one operating device (4), arranged in the metallic luminaire housing (1), for the at least one illuminant (6), wherein
• the operating device (4) has an RF antenna (5) for transmitting a radio signal, and
• the luminaire housing (1) has at least one slot antenna (2) that, by means of a radiation coupling, a waveguide, or a cavity resonator, is coupled to the RF antenna (5) of the operating device (4) in order to transmit the radio signal to outside the luminaire housing, wherein the at least one slot antenna (2) is arranged on one side of the metallic luminaire housing (1) on which the at least one illuminant (6) is arranged, and the luminaire has a transparent cover (3) which covers the at least one slot antenna (2) and the at least one illuminant (6), wherein the luminaire has several LED illuminants (6) in strip-shaped LED modules and several slots forming a group slot antenna in the metallic housing, and further wherein groups of at least two slots are aligned with respect to their main extension direction and separated by a distance greater than half the wavelength of the radio wave transmitted from the RF antenna, and the strip-shaped LED modules and the groups of at least two aligned slots are arranged alternatingly next to one another on said one side of the metallic luminaire housing (1).