The 12086 from Microwave Filter Company is a Waveguide Filter with Frequency 3.7 to 4.2 GHz / 3.7 to 4.2 GHz / 3.625 to 4.2 GHz / 3.625 to 4.2 GHz / 3.4 to 4.2 GHz / 3.4 to 4.2 GHz, Insertion Loss 0.06 to 0.1 dB, Rejection 50 to 80 dB, Rejection Frequency 5.825 to 6.425 GHz. Tags: Low Pass. More details for 12086 can be seen below.