The EMA4D1542P41F30B from ECHO Microwave is a Band Pass Filter with Frequency 1.52 to 1.56 GHz, Insertion Loss 3 dB, Rejection 20 to 60 dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1542P41F30B can be seen below.