The EMA4D1090P15E40B from ECHO Microwave is a Band Pass Filter with Frequency 1.08 to 1.1 GHz, Insertion Loss 2.5 dB, Rejection 40 dB @ Fc±50, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1090P15E40B can be seen below.