The BG3019 from Cobham Microwave is a Space Qualified Circulator with Frequency 3.4 to 4.2 GHz, 3.7 to 4.2 GHz, 4.4 to 4.8 GHz, Average Power Forward 30 W, Average Power Reverse 30 W, Insertion Loss 0.4 to 0.5 dB, Isolation 18 to 20 dB. Tags: Module with Connector, Coaxial Circulator. More details for BG3019 can be seen below.