The CER0274A from CTS Electronic Components is a RF Duplexer with Frequency 1.85 to 2 GHz, Band 1 1.85 to 1.92 GHz, Band 2 1.93 to 2 GHz, Power 3 W, Insertion Loss 3.7 to 3.9 dB. Tags: Ceramic, Surface Mount. More details for CER0274A can be seen below.