The EMA4E2650P300C45D from ECHO Microwave is a Band Pass Filter with Frequency 2.5 to 2.8 GHz, Insertion Loss 1.5 dB, Rejection 20 to 45 dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4E2650P300C45D can be seen below.