The EMA4D2575P30D50B from ECHO Microwave is a Band Pass Filter with Frequency 2.56 to 2.59 GHz, Insertion Loss 2 dB, Rejection 50 dB @ 2185MHz, Return Loss 18 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D2575P30D50B can be seen below.