The USD001A from CTS Electronic Components is a RF Duplexer with Frequency 1.92 to 2.17 GHz, Band 1 2.11 to 2.17 GHz, Band 2 1.92 to 1.98 GHz, Power 6 to 60 W, Insertion Loss 2 dB. Tags: Ceramic, Surface Mount. More details for USD001A can be seen below.