The AM1542-1643D1120 from Anatech Electronics is a RF Duplexer with Frequency 1525 to 1559.5 MHz / 1626 to 1660 MHz, Band 1 1525 to 1559.5 MHz, Band 2 1626 to 1660 MHz, Power 5 W, Insertion Loss 1 to 1.1 dB. Tags: Surface Mount, Ceramic. More details for AM1542-1643D1120 can be seen below.