The ECA1725P250B15A50W from ECHO Microwave is a Band Pass Filter with Frequency 1.6 to 1.85 GHz, Insertion Loss 1 dB, Rejection 25 to 60 dB, Ripple 0.8 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA1725P250B15A50W can be seen below.