The EMA8F2800P40D35B from ECHO Microwave is a Band Pass Filter with Frequency 2.08 to 2.12 GHz, Insertion Loss 2 dB, Rejection 35 dB @2720MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8F2800P40D35B can be seen below.