The WLJ10-5000-5500-40-15000-300 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 5 / 5.5 GHz, Stopband Frequency Chosen Fco x 1.16 to 15 GHz, 3 dB Cutoff Frequency Choice of 5 to 5.5 GHz, Insertion Loss 0.4 to 0.6 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ10-5000-5500-40-15000-300 can be seen below.