The EMA4E1000P35D50D from ECHO Microwave is a Band Pass Filter with Frequency 982 MHz to 1.02 GHz, Insertion Loss 2 dB, Rejection 50 dB @ 865 MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4E1000P35D50D can be seen below.