The PB1446WB from A1 Microwave is a Waveguide Filter with Frequency 3.6 to 4.2 GHz, Insertion Loss 0.25 to 0.3 dB, Rejection 60 to 90 dB, Rejection Frequency DC to 3.185 GHz, 4.55 to 4.9 GHz, 4.9 to 11 GHz. Tags: Band Pass. More details for PB1446WB can be seen below.