The RMCP3840B280M03 from RF MORECOM COREA is a Waveguide Filter with Frequency 3.7 to 3.98 GHz, Input Power 40 dBm, Insertion Loss 1.2 dB, Operating Temperature -40 to 85 Degree C, Rejection 15 to 60 dBc. Tags: Band Pass. More details for RMCP3840B280M03 can be seen below.