The BFCV-2852+ from Mini Circuits is a Band Pass Filter with Frequency 28 to 28.8 GHz, Center Frequency 28.3 GHz, Insertion Loss 2.3 to 3.5 dB, Upper Rejection 12 to 22 dB, Lower Rejection 20 to 42 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFCV-2852+ can be seen below.