Rack or cupboard comprising at least two storage shelves (401, 402, 403, 404, 405), in which at least one RFID antenna, consisting of at least one antenna conductor and an antenna balancing circuit, is arranged in each storage shelf (401, 402, 403, 404, 405), - wherein the rack or cupboard has exactly one writing/reading unit, - wherein the exactly one writing/reading unit is configured so as to control all the antennae in all the storage shelves (401, 402, 403, 404, 405) of the rack, - wherein, between the writing/reading unit and a first antenna in a first storage shelf, and between all the antennae (102, 102a, 102b, 102c, 102d, 102e, 102f, 102g, 102h) of the rack, there is arranged in each case exactly one connection cable (407, 408, 409, 410) having exactly one signal line, by means of which signals can be transmitted, wherein a high-frequency switch is provided in each storage shelf (401, 402, 403, 404, 405) between the connection cable (407, 408, 409, 410) and the at least one antenna (102, 102a, 102b, 102c, 102d, 102e, 102f, 102g, 102h), - wherein the connection cable (407, 408, 409, 410) is in the form of a coaxial cable, such that the connection cable has a single-wire signal line and a shield as the ground, characterised in that - the signal line is simultaneously provided for a DC power supply for a functional unit, - and in that the functional unit is formed of - a control unit having a CPU, - a control receiver and a control transmitter, - a DC power supply unit for supplying power to various functional modules, - the high-frequency switch for high-frequency modulation signals, wherein the high-frequency switch wires an input socket to an output socket or wires the power supply and a high-frequency carrier signal to an antenna in the storage shelf, - the antenna balancing circuit for the antenna, - an antenna switch, - a low-pass filter between the input socket and output socket for conducting the DC power supply for the subsequent storage shelves, - wherein the control receiver and the control transmitter communicate with the control unit CPU, and the control unit controls a changeover switch, - wherein each storage shelf (401, 402, 403, 404, 405) has a functional unit, - wherein the DC power supply and the control receiver and control transmitter are connected to the changeover switch in such a way that they are connected to the input socket in every switching position. - wherein the rack or cupboard has exactly one writing/reading unit, - wherein the exactly one writing/reading unit is configured so as to control all the antennae in all the storage shelves (401, 402, 403, 404, 405) of the rack, - wherein, between the writing/reading unit and a first antenna in a first storage shelf, and between all the antennae (102, 102a, 102b, 102c, 102d, 102e, 102f, 102g, 102h) of the rack, there is arranged in each case exactly one connection cable (407, 408, 409, 410) having exactly one signal line, by means of which signals can be transmitted, wherein a high-frequency switch is provided in each storage shelf (401, 402, 403, 404, 405) between the connection cable (407, 408, 409, 410) and the at least one antenna (102, 102a, 102b, 102c, 102d, 102e, 102f, 102g, 102h), - wherein the connection cable (407, 408, 409, 410) is in the form of a coaxial cable, such that the connection cable has a single-wire signal line and a shield as the ground, - the signal line is simultaneously provided for a DC power supply for a functional unit, - and in that the functional unit is formed of - a control unit having a CPU, - a control receiver and a control transmitter, - a DC power supply unit for supplying power to various functional modules, - the high-frequency switch for high-frequency modulation signals, wherein the high-frequency switch wires an input socket to an output socket or wires the power supply and a high-frequency carrier signal to an antenna in the storage shelf, - the antenna balancing circuit for the antenna, - an antenna switch, - a low-pass filter between the input socket and output socket for conducting the DC power supply for the subsequent storage shelves, - a control unit having a CPU, - a control receiver and a control transmitter, - a DC power supply unit for supplying power to various functional modules, - the high-frequency switch for high-frequency modulation signals, wherein the high-frequency switch wires an input socket to an output socket or wires the power supply and a high-frequency carrier signal to an antenna in the storage shelf, - the antenna balancing circuit for the antenna, - an antenna switch, - a low-pass filter between the input socket and output socket for conducting the DC power supply for the subsequent storage shelves, - wherein the control receiver and the control transmitter communicate with the control unit CPU, and the control unit controls a changeover switch, - wherein each storage shelf (401, 402, 403, 404, 405) has a functional unit, - wherein the DC power supply and the control receiver and control transmitter are connected to the changeover switch in such a way that they are connected to the input socket in every switching position.