The XLF-123-D+ from Mini Circuits is a Low Pass RF Filter with Frequency DC to 12.2 GHz, Stopband Frequency 18.1 to 29 GHz, 3 dB Cutoff Frequency 15 GHz, Insertion Loss 1.8 dB, Rejection 16 to 20 dB. Tags: Die, Reflectionless Filter. More details for XLF-123-D+ can be seen below.