The QMC-CRYOTEE-0.218SMA-FFF from Quantum Microwave is a Bias Tee with Frequency 0.2 to 18 GHz, Max. Voltage 35 V, Max Current 0.25 A, Insertion Loss 0.25 to 1 dB, Return Loss -20 to -15 dB. Tags: Module with Connectors, Cryogenic. More details for QMC-CRYOTEE-0.218SMA-FFF can be seen below.