The ECA865P2FR55BP from ECHO Microwave is a Band Pass Filter with Frequency 865 to 866.2 MHz, Insertion Loss 3 dB, Rejection 55 dB @ 869 to 1500MHz, Ripple 0.5 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA865P2FR55BP can be seen below.