An expansion device for a wireless antenna

The invention relates to an expansion unit (1) for a radio antenna (2), wherein the radio antenna (2) serves to transmit radio signals for wireless data transmission and receiving, and wherein the radio signals comprise a first transmission protocol and a first transmission frequency. Furthermore, there is provided a connecting element (3) with which the expansion device (1) to the radio antenna (2) is connected; Moreover, a first transmission / reception unit (4) is provided which serves to receive the transmission radio signals from the radio antenna (2), wherein a converter (5) is provided which is designed so that it (the transmission of radio signals from the radio antenna 2) into a second transmission protocol and / or in a second transmission frequency, wherein a second transmission / reception unit (6) is provided which serves to transmit the converted transmission radio signals, and wherein a circuit (7) is provided configured to is that it draws energy from the received radio signals.