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The design, simulation and measurement of a beam steerable slotted waveguideantenna operating in X band are presented. The proposed beam steerable antennaconsists of a standard rectangular waveguide (RWG) section with longitudinalslots in the broad wall. The beam steering in this configuration is achieved byrotating two dielectric slabs inside the waveguide and consequently changingthe phase of the slots excitations. In order to confirm the usefulness of thisconcept, a non-resonant 20-slot waveguide array antenna with an element spacingof d = 0.58{\lambda}0 has been designed, built and measured. A 14 deg beamscanning from near broadside ({\theta} = 4 deg) toward end-fire ({\theta} = 18deg) direction is observed. The gain varies from 18.33 dB to 19.11 dB whichcorresponds to the radiation efficiencies between 95% and 79%. The side-lobelevel is -14 dB at the design frequency of 9.35 GHz. The simulated co-polarizedrealized gain closely matches the fabricated prototype patterns.

A Continuous Beam Steering Slotted Waveguide Antenna Using Rotating Dielectric Slabs