Analysis and design of a narrow aperture coupled rectangular dielectric resonator antenna (DRA) fed by dielectric image line (DIL) are presented. The modal expansion method is used to describe the fields in the dielectric resonator side and the change in the modal voltage of the image line at the aperture is developed to analyze the single element DRA. The DIL is connected to the Xband rectangular waveguide through a waveguide transition and DIL tapering is used to match between the waveguide and the DIL.
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