Our AM1950-2140D1098 is a Ceramic Duplexer with a passband ripple of 0.5 dB Max. This Ceramic Duplexer has an insertion loss of 1.5 dB Max and a return loss of 18 dB Min. For more information, click here. Datasheet: 1950 MHz / 2140 MHz Ceramic Duplexer (anatechelectronics.com)