The ECRA1800R5B45A from ECHO Microwave is a Band Stop Filter with Stopband Frequency 1797.5 to 1802.5 MHz, Bandwidth 5 MHz, Insertion Loss 1 dB, Rejection 45 dB. Tags: Module with Connectors, Notch Filter, Cavity Filter. More details for ECRA1800R5B45A can be seen below.