The EMA3C2700P40F20A from ECHO Microwave is a Band Pass Filter with Frequency 2.68 to 2.72 GHz, Insertion Loss 3 dB, Rejection 20 to 30 dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA3C2700P40F20A can be seen below.