The AM1542-1643D1096 is a Ceramic Duplexer with a bandwidth of 30 MHz and a passband ripple of 0.7 dB Max. This Duplexer has a return loss of 14 dB Min and an insertion loss of 2.0 dB Min. For more information, click here. Datasheet: 1542 MHz /1643 MHz Ceramic Duplexer (anatechelectronics.com)