The RFLC-306-1 from RF-Lambda is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Bandwidth Bandwidth: 200 MHz, Average Power Forward 10 W, Insertion Loss 0.3 dB, Isolation 23 dB. Tags: Drop-in Circulator. More details for RFLC-306-1 can be seen below.