The EMA4C2650P20E35B from ECHO Microwave is a Band Pass Filter with Frequency 2.64 to 2.66 GHz, Insertion Loss 2.5 dB, Rejection 20 to 35 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4C2650P20E35B can be seen below.