A circuit arrangement for an RF loopback

In one embodiment, a circuit arrangement comprising a transceiver unit (TU), one to the transceiver unit (TU) coupled to said switching means (SW) having a terminal (10) configured for coupling to an antenna device (AD), one to the switching means (SW) coupled control device (CD), wherein the control device (CD) is configured for operating the circuit arrangement in a first and in a second operating mode, wherein in the first operation mode, the switching means (SW) by the control device (CD) is configured such that a first signal from the transceiver unit (TU) via the switching device (SW) in a feedback loop back to the transceiver unit (TU) is directed, and in the second operating mode, the switching means (SW) by the control device (CD) is configured such that a second signal from the transceiver unit (TU) via the switching device (SW) (to the terminal 1 0) is directed or the second signal from the terminal (10) via the switching device (SW) (to the transceiver unit TU) is directed.