The VMDC-3642 from VidaRF is a RF & Microwave Circulator with Frequency 3.60 to 4.20 GHz, Average Power Forward 20 W, Average Power Reverse 20 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Drop-in Circulator. More details for VMDC-3642 can be seen below.