The EMA8J1000P25J40D from ECHO Microwave is a Band Pass Filter with Frequency 987 MHz to 1.01 GHz, Insertion Loss 5 dB, Rejection 40 dB @ 975 MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1000P25J40D can be seen below.