The ECA3512P25D50BP from ECHO Microwave is a Band Pass Filter with Frequency 3.5 to 3.53 GHz, Insertion Loss 2 dB, Rejection 50 dB @ 3550 to 3575MHz, Ripple 1 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA3512P25D50BP can be seen below.