The SDKB180188AA from Sangshin is a RF & Microwave Circulator with Frequency 1805 to 1880 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 SDKB180188AA can be seen below.