The T3ZB1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.65 to 4.25 GHz, Average Power 0.001 W, Average Power Forward 0.001 W, Insertion Loss 0.8 dB, Isolation 20 dB. Tags: Microstrip, Microstrip Isolator. More details for T3ZB1 can be seen below.