The AD3437-3537D241 from Anatech Electronics is a RF Duplexer with Frequency 3450 to 3475 MHz / 3550 to 3575 MHz, Band 1 3450 to 3475 MHz, Band 2 3550 to 3575 MHz, Insertion Loss 1 dB, Isolation 40 dB. Tags: Module with Connectors. More details for AD3437-3537D241 can be seen below.