The ECA420P20C30B from ECHO Microwave is a Band Pass Filter with Frequency 410 to 430 MHz, Insertion Loss 1.5 dB, Rejection 30 dB @ 450 to 470MHz, Ripple 0.8 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA420P20C30B can be seen below.