The DEA255787BT-2044A1 from TDK is a Band Pass Filter with Frequency 5.725 to 5.85 GHz, Bandwidth 125 MHz, Center Frequency 5.7875 GHz, Insertion Loss 1 to 1.6 dB, Rejection 25 to 60.3 dB. Tags: Surface Mount. More details for DEA255787BT-2044A1 can be seen below.