The AE1857-1937DB2003 from Anatech Electronics is a RF Duplexer with Frequency 1.85 to 1.865 GHz / 1.93 to 1.945 GHz, Band 1 1.85 to 1.865 GHz, Band 2 1.93 to 1.945 GHz, Power 20 W, Insertion Loss 0.8 dB. Tags: Module with Connectors. More details for AE1857-1937DB2003 can be seen below.