The DFC0203R1900P120 from Zhejiang Jiakang Electronics is a Band Pass Filter with Frequency 1.84 to 1.96 GHz, Bandwidth 120 MHz, Center Frequency 1900 MHz, Insertion Loss 2.5 dB, Rejection 25 to 40 dB. Tags: Surface Mount. More details for DFC0203R1900P120 can be seen below.