The AE1890-1970DB0045-B from Anatech Electronics is a RF Duplexer with Frequency 1.87 to 1.91 GHz / 1.95 to 1.99 GHz, Band 1 1.87 to 1.91 GHz, Band 2 1.95 to 1.99 GHz, Insertion Loss 1 dB, Isolation 35 dB. Tags: Module with Connectors. More details for AE1890-1970DB0045-B can be seen below.