The EMA4D2350P100D40D from ECHO Microwave is a Band Pass Filter with Frequency 2.3 to 2.4 GHz, Insertion Loss 2 dB, Rejection 40 dB @ 2000 MHz, Return Loss 14 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D2350P100D40D can be seen below.