The ATEK857N4 from ATEK MIDAS is a Band Pass Filter with Frequency 30.5 to 33 GHz, Bandwidth 2500 MHz, Center Frequency 31750 MHz, Insertion Loss 3.3 to 4 dB, Upper Rejection 30 dBc @ 37 GHz. Tags: Surface Mount. More details for ATEK857N4 can be seen below.