The JCD17K3T18K1G1 from JQL Electronics is a RF & Microwave Circulator with Frequency 17.3 to 18.1 GHz, Average Power Forward 10 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -40 to 75 Degree C. Tags: Drop-in Circulator. More details for JCD17K3T18K1G1 can be seen below.