The JCD4350T4550G2 from JQL Electronics is a RF & Microwave Circulator with Frequency 4.35 to 4.55 GHz, Average Power Forward 20 W, Insertion Loss 0.3 dB, Isolation 23 dB, Operating Temperature -40 to 75 Degree C. Tags: Drop-in Circulator. More details for JCD4350T4550G2 can be seen below.