The BFHK-1272+ from Mini Circuits is a Band Pass Filter with Frequency 11900 to 12800 MHz, Bandwidth 900 MHz, Center Frequency 12.3 GHz, Insertion Loss 2.9 to 4.5 dB, Upper Rejection 55 to 100 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFHK-1272+ can be seen below.