The DFS0403R1236P020 from Zhejiang Jiakang Electronics is a Band Pass Filter with Frequency 1.226 to 1.246 GHz, Bandwidth 20 MHz, Center Frequency 1236 MHz, Insertion Loss 2 dB, Rejection 45 dB. Tags: Surface Mount. More details for DFS0403R1236P020 can be seen below.