The WLJ5-4500-5000-40-14000-300 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 4.5 / 5 GHz, Stopband Frequency Chosen Fco x 1.53 to 14 GHz, 3 dB Cutoff Frequency Choice of 4.5 to 5 GHz, Insertion Loss 0.25 to 0.3 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ5-4500-5000-40-14000-300 can be seen below.