The CER0690C from CTS Electronic Components is a RF Duplexer with Frequency 1.85 to 1.99 GHz, Band 1 1.93 to 1.99 GHz, Band 2 1.85 to 1.91 GHz, Power 20 to 200 W, Insertion Loss 2.3 dB. Tags: Ceramic, Surface Mount. More details for CER0690C can be seen below.