The BFCQ-4302+ from Mini Circuits is a Band Pass Filter with Frequency 36.5 to 50 GHz, Center Frequency 42.7 GHz, Insertion Loss 2 to 3 dB, Upper Rejection 10 to 30 dB, Lower Rejection 20 to 40 dB. Tags: Ceramic, Ceramic Filter. More details for BFCQ-4302+ can be seen below.