The ECA20750P1500L50A from ECHO Microwave is a Band Pass Filter with Frequency 20 to 21.5 GHz, Insertion Loss 5 dB, Rejection 50 dB @ 10000 to 17000MHz, Ripple 3 dB, Return Loss 16 dB. Tags: Cavity Filter. More details for ECA20750P1500L50A can be seen below.