Abstract
Most waveguide antennas use hollow waveguide with arrays of slot elements, offering a simple and highly efficient structure. Coaxial waveguide allows a smaller cross-section, and using just one element, or two co-located elements, leads to a compact antenna. We present new, dual- and single-slot designs based on coaxial waveguide that are compact and wideband. The designs include a coaxial feed, and are fabricated and measured to verify their performance.
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