The UPD003A from CTS Electronic Components is a RF Duplexer with Frequency 1.71 to 1.88 GHz, Band 1 1.81 to 1.88 GHz, Band 2 1.71 to 1.79 GHz, Power 1.5 to 15 W, Insertion Loss 3 dB. Tags: Ceramic, Surface Mount. More details for UPD003A can be seen below.