The WLKX10-3000-10500-60-21000-20 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 3 / 10.5 GHz, Stopband Frequency Chosen Fco x 1.16 to 21 GHz, 3 dB Cutoff Frequency Choice of 3 to 10.5 GHz, Insertion Loss 0.8 to 1.3 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLKX10-3000-10500-60-21000-20 can be seen below.