The WLKX10-10500-15000-40-21000-20 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 10.5 / 15 GHz, Stopband Frequency Chosen Fco x 1.16 to 21 GHz, 3 dB Cutoff Frequency Choice of 10.5 to 15 GHz, Insertion Loss 0.8 to 1 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLKX10-10500-15000-40-21000-20 can be seen below.