The DTF200100 from NETA Communications is a Waveguide Filter with Frequency 19.7 to 20.2 GHz, Insertion Loss 0.3 dB, Operating Temperature -40 to 85 Degree C, Rejection 25 to 40 dB (@25 GHz, 30 GHz), Rejection Frequency 25 to 31 GHz. Tags: Band Stop. More details for DTF200100 can be seen below.