The DEA203600BT-7127E3 from TDK is a Band Pass Filter with Frequency 3.4 to 3.8 GHz, Bandwidth 400 MHz, Center Frequency 3.6 GHz, Insertion Loss 1.5 to 2.4 dB, Rejection 15 to 52 dB. Tags: Surface Mount. More details for DEA203600BT-7127E3 can be seen below.