The USD028A from CTS Electronic Components is a RF Duplexer with Frequency 703 to 803 MHz, Band 1 758 to 803 MHz, Band 2 703 to 748 MHz, Power 6 to 60 W, Insertion Loss 2.6 to 2.6 dB. Tags: Ceramic, Surface Mount. More details for USD028A can be seen below.