The EMA4H4800P40P50D from ECHO Microwave is a Band Pass Filter with Frequency 4.78 to 4.82 GHz, Insertion Loss 8 dB, Rejection 50 dB @ 4730 MHz, Return Loss 14 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4H4800P40P50D can be seen below.