The WLJ10-3100-3200-40-12000-300 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 3.1 / 3.2 GHz, Stopband Frequency Chosen Fco x 1.16 to 12 GHz, 3 dB Cutoff Frequency Choice of 3.1 to 3.2 GHz, Insertion Loss 0.4 to 0.6 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ10-3100-3200-40-12000-300 can be seen below.