The Siemens 6GT2890-0BB00 is a 3 dB antenna attenuator for the SIMATIC RF600 family, designed to reduce signal power by half in a 50 Ω system. It handles up to 2 W continuous power and connects via an RP-TNC interface — the standard threaded coupling for RF600 antenna cables. The metal housing in silver finish provides RF shielding and mechanical durability for industrial environments.
This attenuator sits between the RF600 reader or antenna cable and the antenna itself. The RP-TNC connection mates directly with the cable assembly, so no adapter is needed. The 3 dB value is useful when you need to lower the radiated power to meet regulatory limits or to prevent receiver saturation in close-range read zones — common in dense tag arrays or tunnel portals.