The XBF-183-D+ from Mini Circuits is a Band Pass Filter with Frequency 17.5 to 18.5 GHz, Bandwidth 500 MHz, Center Frequency 18000 MHz, Insertion Loss 4.3 dB, Rejection 50 to 77 dB. Tags: Die, Reflectionless Filter. More details for XBF-183-D+ can be seen below.