The design and experimental fiidinga of a novel approach for a relatively simple low-cost freqnency-scanning mifliiter-wave antenna are described. The antenna consists of a silicon dielectric redangular rod with periodic metalfic stripe perturbations on one side. The feasibility of electronically scanning through a range of angles by varying the freqnency fed into the silicon rod is shown. CafcuIations were made to determine the allowable physical size of the sificon rod in order to maintain a single fundamental mode of operation and the effect which Sk variations and perturbation spacing have on the angle of radiation and the range of angular scan for a given frequency shift. Efforts covered the freqnency range 55-100 GHs with specific points of intereat at 60,70, and 94 GHz. The reanhs of the experiments conducted are compared with the theoretical cafcrdations. I.

AbsH-lhe design and experkmtaf fin-for a low-cost easfly fabricated mflffmeter-wave fine scmmer is described. 'HI& antenna wnsfsts of a l-mm X l-mm sificon dieketrie rod with a metal grating @siodic shcture) on the upper surface and pi-rA dfodea mounted on the sidewalf. Anarrow 8°beamis radiated from the grated @rturb@surface atan angle dependent on the guide and pwturbalion spacing. Ihe beam angle Ls switckd over a 10°angle by application of a de forward current thmogh the p-in diode nmdufatra9.

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