The ECRA1805F1880C52A from ECHO Microwave is a Band Stop Filter with Stopband Frequency 1805 to 1880 MHz, Bandwidth 75 MHz, Insertion Loss 1.4 dB ( 0-1785, 1900-3000 MHz), 2.1 dB ( 3000-3600 MHz), Rejection 52 dB. Tags: Module with Connectors, Ceramic Filter. More details for ECRA1805F1880C52A can be seen below.