The AD3437-3537D240 from Anatech Electronics is a RF Duplexer with Frequency 3425 to 3450 MHz / 3525 to 3550 MHz, Band 1 3425 to 3450 MHz, Band 2 3525 to 3550 MHz, Insertion Loss 1 dB, Isolation 40 dB. Tags: Module with Connectors. More details for AD3437-3537D240 can be seen below.