The QMC-CRYOTEE-0.218 from Quantum Microwave is a Bias Tee with Frequency 200 MHz to 18 GHz, Max. Voltage 50 V, Max Current 0.225 A, Insertion Loss 0.25 to 1 dB, Return Loss -20 to -15 dB. Tags: Module with Connector, Cryogenic. More details for QMC-CRYOTEE-0.218 can be seen below.