The LFHK-3800+ from Mini Circuits is a Low Pass RF Filter with Frequency DC to 3800 MHz, Stopband Frequency 5800 to 46000 MHz, 3 dB Cutoff Frequency 4800 MHz, Insertion Loss 1 to 1.6 dB, Rejection 20 to 74 dB. Tags: Surface Mount, Ceramic Filter. More details for LFHK-3800+ can be seen below.