The PB1551WB-CG/CG-B from A1 Microwave is a Waveguide Filter with Frequency 3.4 to 4.2 GHz, Insertion Loss 0.25 dB, Rejection 60 to 90 dB, Rejection Frequency 0 to 3 GHz, 4.55 to 4.9 GHz, 4.9 to 10.5 GHz. Tags: Band Pass. More details for PB1551WB-CG/CG-B can be seen below.