The WLKE3-15-20-40-8000-1 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 15 / 20 MHz, Stopband Frequency Chosen Fco x 1.24 to 8 GHz, 3 dB Cutoff Frequency Choice of 15 to 20 MHz, Insertion Loss 0.8 to 1.2 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLKE3-15-20-40-8000-1 can be seen below.