The CER0669A from CTS Electronic Components is a RF Duplexer with Frequency 1.71 to 1.85 GHz, Band 1 1.81 to 1.85 GHz, Band 2 1.71 to 1.76 GHz, Power 5 W, Insertion Loss 2.2 to 2.3 dB. Tags: Ceramic, Surface Mount. More details for CER0669A can be seen below.