The QMC-CRYOCHOKE-DC18 from Quantum Microwave is a Bias Tee with Frequency DC to 18 GHz, Max. Voltage 50 Volts, Max Current 225 mA, Insertion Loss 0.25 to 1 dB, Return Loss -15 to -20 dB. Tags: Module with Connector, Cryogenic. More details for QMC-CRYOCHOKE-DC18 can be seen below.