The WLJ10-1100-1200-40-5000-300 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 1.1 / 1.2 GHz, Stopband Frequency Chosen Fco x 1.16 to 5 GHz, 3 dB Cutoff Frequency Choice of 1.1 to 1.2 GHz, Insertion Loss 0.4 to 0.6 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ10-1100-1200-40-5000-300 can be seen below.