The ECA2000P100D25K (BPF11) from ECHO Microwave is a Band Pass Filter with Frequency 1.95 to 2.05 GHz, Insertion Loss 2 dB, Rejection 25 to 60 dB, Ripple 0.5 dB, Return Loss 16 dB. Tags: Cavity Filter. More details for ECA2000P100D25K (BPF11) can be seen below.