The BFHK-4951+ from Mini Circuits is a Band Pass Filter with Frequency 4300 to 5300 MHz, Bandwidth 1000 MHz, Center Frequency 4.8 GHz, Insertion Loss 3.2 to 4.5 dB, Upper Rejection 60 to 73 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFHK-4951+ can be seen below.