The ECRA1550F1600A30A from ECHO Microwave is a Band Stop Filter with Stopband Frequency 1550 to 1600 MHz, Bandwidth 50 MHz, Insertion Loss 0.5 dB ( 500-1500, 1650-3000 MHz), Rejection 30 dB. Tags: Module with Connectors, Ceramic Filter. More details for ECRA1550F1600A30A can be seen below.