The WLJ3-1000-2250-40-6000-50 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 1 / 2.25 GHz, Stopband Frequency Chosen Fco x 2 to 6 GHz, 3 dB Cutoff Frequency Choice of 1 to 2.25 GHz, Insertion Loss 0.2 to 0.25 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ3-1000-2250-40-6000-50 can be seen below.