The WLJ10-2900-3000-40-12000-300 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 2.9 / 3 GHz, Stopband Frequency Chosen Fco x 1.16 to 12 GHz, 3 dB Cutoff Frequency Choice of 2.9 to 3 GHz, Insertion Loss 0.4 to 0.6 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ10-2900-3000-40-12000-300 can be seen below.