The AM1747-1842D1091 from Anatech Electronics is a RF Duplexer with Frequency 1805 to 1880 MHz / 1710 to 1785 MHz, Band 1 1805 to 1880 MHz, Band 2 1710 to 1785 MHz, Power 3 W, Insertion Loss 2.1 to 2.8 dB. Tags: Surface Mount, Ceramic. More details for AM1747-1842D1091 can be seen below.