The EMA4H3750P20H50D from ECHO Microwave is a Band Pass Filter with Frequency 3.74 to 3.76 GHz, Insertion Loss 4 dB, Rejection 50 dB @ 3660 MHz, Return Loss 14 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4H3750P20H50D can be seen below.