The ECA3687P25DL50BP from ECHO Microwave is a Band Pass Filter with Frequency 3.68 to 3.7 GHz, Insertion Loss 2 dB, Rejection 50 dB @ 3600 to 3650MHz, Ripple 1 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA3687P25DL50BP can be seen below.