The AD4A1227/1575S20KCA from Vanlong is a RF Duplexer with Frequency 1.217 to 1.585 GHz, Band 1 1.217 to 1.237 GHz, Band 2 1.565 to 1.585 GHz, Insertion Loss 1 dB, Attenuation 40 dB. Tags: Surface Mount. More details for AD4A1227/1575S20KCA can be seen below.