The KFF6675A 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, Insertion Loss 3.6 to 3.9 dB, Attenuation 40 to 56 dB. Tags: Ceramic, Surface Mount. More details for KFF6675A can be seen below.