The AM1030-1090D1090 from Anatech Electronics is a RF Duplexer with Frequency 1018 to 1042 MHz / 1078 to 1102 MHz, Band 1 1018 to 1042 MHz, Band 2 1078 to 1102 MHz, Power 1 W, Insertion Loss 3 dB. Tags: Surface Mount, Ceramic. More details for AM1030-1090D1090 can be seen below.