The EMA4D3300P400C35D from ECHO Microwave is a Band Pass Filter with Frequency 3.1 to 3.5 GHz, Insertion Loss 1.2 dB, Rejection 35 to 40 dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D3300P400C35D can be seen below.