The WLJ9-1000-3000-60-6000-50 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 1 / 3 GHz, Stopband Frequency Chosen Fco x 1.19 to 6 GHz, 3 dB Cutoff Frequency Choice of 1 to 3 GHz, Insertion Loss 0.6 to 0.9 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ9-1000-3000-60-6000-50 can be seen below.