The VMDC-4244 from VidaRF is a RF & Microwave Circulator with Frequency 4.20 to 4.40 GHz, Average Power Forward 20 W, Average Power Reverse 20 W, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Drop-in Circulator. More details for VMDC-4244 can be seen below.