The letter reports new results of fin-line PIN-diode attenuators and switches for the 94 GHz range. Design and performance of SPST and SPDT switches—single-pole single-throw and single-pole double-throw, respectively—will be presented. The attenuation of the SPST switch, for example, can be adjusted between 2 and 35 dB over the entire waveguide band from 75 to 110 GHz.