The DF2RB1890L-20M1 from Innertron is a Band Pass Filter with Frequency 1.87 to 1.91 GHz, Bandwidth 20 MHz, Center Frequency 1890 MHz, Insertion Loss 2.5 dB, Rejection 20 dB@ 860 to 1680 MHz. Tags: Surface Mount. More details for DF2RB1890L-20M1 can be seen below.