The WLJ10-3000-3100-60-12000-300 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 3 / 3.1 GHz, Stopband Frequency Chosen Fco x 1.24 to 12 GHz, 3 dB Cutoff Frequency Choice of 3 to 3.1 GHz, Insertion Loss 0.4 to 0.6 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ10-3000-3100-60-12000-300 can be seen below.