The SDKB193199AA from Sangshin is a RF & Microwave Circulator with Frequency 1930 to 1990 MHz, Average Power Forward 125 W, Insertion Loss 0.2 to 0.25 dB, Isolation 22 to 26 dB, Return Loss 22 to 26 dB. Tags: Surface Mount Circulator. More details for SDKB193199AA can be seen below.