The QAD Series from QuinStar Technology Inc is a Waveguide Attenuator with Frequency 18 to 220 GHz, Average Power 0.3 to 1 W, Attenuation 0 to 50 dB, Insertion Loss 0.3 to 3.5 dB. Tags: Direct Reading Attenuator. More details for QAD Series can be seen below.