The BFHK-1252+ from Mini Circuits is a Band Pass Filter with Frequency 10900 to 13900 MHz, Bandwidth 3000 MHz, Center Frequency 12.3 GHz, Insertion Loss 2.8 to 4.0 dB, Upper Rejection 60 to 80 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFHK-1252+ can be seen below.