The DEA252450BT-2031A1 from TDK is a Band Pass Filter with Frequency 2.4 to 2.5 GHz, Bandwidth 100 MHz, Center Frequency 2.45 GHz, Insertion Loss 1.04 to 1.8 dB, Rejection 20 to 47.6 dB. Tags: Surface Mount. More details for DEA252450BT-2031A1 can be seen below.