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Wideband coaxial probe-fed dielectric resonator antenna (DRA) arrays with hard horn excitation are investigated, in waveguide-based spatial power combining systems. The pyramidal horn is rst studied by the Finite-Difference Time-Domain (FDTD) approach with region-by-region discretization and a uniform eld distribution is obtained at the horn aperture. Then, a one dimensional 4 ? 1 embedded DRA array...
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