The QAF Series from QuinStar Technology Inc is a Waveguide Attenuator with Frequency 18 to 220 GHz, Average Power 0.3 to 1 W, Attenuation 3 dB, 6 dB, 10 dB, 15 dB, 20 dB, 30 dB, 40 dB. Tags: Calibrated Attenuator, Rotary Attenuator. More details for QAF Series can be seen below.