The AM1747-1842D1172 from Anatech Electronics is a RF Duplexer with Frequency 1710 to 1785 MHz / 1805 to 1880 MHz, Band 1 1710 to 1785 MHz, Band 2 1805 to 1880 MHz, Power 3 W, Insertion Loss -3.2 to -3 dB. Tags: Surface Mount, Ceramic. More details for AM1747-1842D1172 can be seen below.