The XLF-221-D+ from Mini Circuits is a Low Pass RF Filter with Frequency DC to 0.22 GHz, Stopband Frequency 570 MHz to 12 GHz, 3 dB Cutoff Frequency 0.37 GHz, Insertion Loss 1.4 dB, Rejection 15 to 26 dB. Tags: Die, Reflectionless Filter. More details for XLF-221-D+ can be seen below.