The WVBP-283-WR28+ from Mini Circuits is a Waveguide Filter with Frequency 27.5 to 28.35 GHz, Insertion Loss 0.5 to 2 dB, Operating Temperature -40 to 85 Degree C, Rejection 20 to 65 dB. Tags: Band Pass. More details for WVBP-283-WR28+ can be seen below.