The BF3007 from Cobham Microwave is a Space Qualified Circulator with Frequency 3.7 to 4.2 GHz, Average Power Forward 30 W, Average Power Reverse 30 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Module with Connector, Coaxial Circulator. More details for BF3007 can be seen below.