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In this paper, an Ultra-Wide-Band (UWB) Antipodal Vivaldi antenna with higher radiation performances is proposed. Zero-index metamaterials units with Meander-line shape are placed on the antenna aperture to improve the antenna directivity. An increase of 4 dB in the gain with equal beamwidths in the E and H planes is achieved at different frequencies. The antenna covers 142.8% bandwidth with input...
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