The SG10521 from Honeywell is a RF & Microwave Circulator with Frequency 2 to 2.4 GHz, Insertion Loss 0.3 to 0.4 dB, Isolation 20 to 23 dB, Return Loss 20 to 23 dB, Operating Temperature -10 to 65 Degree C. Tags: Coaxial Circulator. More details for SG10521 can be seen below.