The SDKB211217AA from Sangshin is a RF & Microwave Circulator with Frequency 2110 to 2170 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 SDKB211217AA can be seen below.