The ECA20500P2L13A from ECHO Microwave is a Band Pass Filter with Frequency 20.5 to 20.5 GHz, Insertion Loss 6 dB, Rejection 13 dB @ DC to 20480MHz, Ripple 4 dB, Return Loss 16 dB. Tags: Cavity Filter. More details for ECA20500P2L13A can be seen below.