The ECRA2120S2170C40BAB from ECHO Microwave is a Band Stop Filter with Stopband Frequency 2120 to 2170 MHz, Bandwidth 50 MHz, Insertion Loss 1.5 dB, Rejection 30 dB, Upper Rejection 30 to 40 dB. Tags: Module with Connectors, Notch Filter, Cavity Filter. More details for ECRA2120S2170C40BAB can be seen below.