The BP5900B0805DT from Frontier Electronics is a Band Pass Filter with Frequency 4.9 to 5.85 GHz, Insertion Loss 2.1 dB, Rejection 15 to 35 dB, VSWR 2.00:1, Operating_Temperature -40 to 85 Degree C. Tags: Surface Mount, Ceramic Filter. More details for BP5900B0805DT can be seen below.