The RFLC-306-2 from RF-Lambda is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Bandwidth Bandwidth: 400 MHz, Average Power Forward 10 W, Insertion Loss 0.4 dB, Isolation 21 dB. Tags: Drop-in Circulator. More details for RFLC-306-2 can be seen below.