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An ultrawideband metamaterial slab (meta-slab) covered antipodal Vivaldi antenna (AVA) with high-gain and stable radiation patterns is presented. The meta-slab exploiting the dispersive nature of metamaterial exhibits an effective permittivity function higher than the one of the bare dielectric slabs. The high-permittivity meta-slab sucks energy from the tapered slot and the flare termination of the...
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