The WBLB-T-BP-21820-800/3-4C from A-Info is a Band Pass Filter with Frequency 21.42 to 22.22 GHz, Insertion Loss 3 dB, Rejection 40 dB, VSWR 2.50:1. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-21820-800/3-4C can be seen below.