The AM1542-1643D1031 from Anatech Electronics is a RF Duplexer with Frequency 1525 to 1559 MHz / 1626.5 to 1660.5 MHz, Band 1 1525 to 1559 MHz, Band 2 1626.5 to 1660.5 MHz, Power 3 W, Insertion Loss 1.3 dB. Tags: Surface Mount, Ceramic. More details for AM1542-1643D1031 can be seen below.