The BFCO-552+ from Mini Circuits is a Band Pass Filter with Frequency 4900 to 6100 MHz, Center Frequency 5500 MHz, Insertion Loss 1.9 to 2.2 dB, Upper Rejection 26 dB, Lower Rejection 22 dB. Tags: Ceramic, Ceramic Filter. More details for BFCO-552+ can be seen below.