The BFHK-6251+ from Mini Circuits is a Band Pass Filter with Frequency 5350 to 6700 MHz, Bandwidth 1350 MHz, Center Frequency 6.1 GHz, Insertion Loss 3.2 to 4.5 dB, Upper Rejection 66 to 76 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFHK-6251+ can be seen below.