The CD-3950-ST from UTE Microwave is a RF & Microwave Isolator with Frequency 3.7 to 4.2 GHz, Average Power 5 W, Average Power Forward 5 W, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for CD-3950-ST can be seen below.