The WBLB-T-BP-11900-420/3-8C from A-Info is a Band Pass Filter with Frequency 11.69 to 12.11 GHz, Insertion Loss 2 dB, Rejection 40 to 50 dB, VSWR 1.50:1, Operating_Temperature -40 to 80 Degree C. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-11900-420/3-8C can be seen below.