The EMA4F3300P400D40D from ECHO Microwave is a Band Pass Filter with Frequency 3.1 to 3.5 GHz, Insertion Loss 2 dB, Rejection 40 dB @ 2790MHz, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4F3300P400D40D can be seen below.