The EMA4D1030P11F15B from ECHO Microwave is a Band Pass Filter with Frequency 1.02 to 1.04 GHz, Insertion Loss 2.7 dB, Rejection 15 to 40 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1030P11F15B can be seen below.