The WLJ3-2250-3500-40-8000-50 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 2.25 / 3.5 GHz, Stopband Frequency Chosen Fco x 2 to 8 GHz, 3 dB Cutoff Frequency Choice of 2.25 to 3.5 GHz, Insertion Loss 0.2 to 0.25 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ3-2250-3500-40-8000-50 can be seen below.