The XLF-123+ 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 to 2.4 dB, Rejection 14 to 20 dB. Tags: Surface Mount, Reflectionless Filter. More details for XLF-123+ can be seen below.