The EMA4F2350P100C50D from ECHO Microwave is a Band Pass Filter with Frequency 2.3 to 2.4 GHz, Insertion Loss 1.5 dB, Rejection 50 dB @ 2570 to 2620MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4F2350P100C50D can be seen below.