The AE4520-4840DB5447 from Anatech Electronics is a RF Duplexer with Frequency 4400 to 4640 MHz / 4740 to 4940 MHz, Band 1 4400 to 4640 MHz, Band 2 4740 to 4940 MHz, Power 20 W, Insertion Loss 1.25 dB. Tags: Module with Connectors. More details for AE4520-4840DB5447 can be seen below.