A Miniaturized and High Gain Double-Slot Vivaldi Antenna Using Wideband Index-Near-Zero Metasurface



Zhu, S, Liu, H, Wen, P, Du, L and Zhou, J ORCID: 0000-0002-3940-3320
(2018) A Miniaturized and High Gain Double-Slot Vivaldi Antenna Using Wideband Index-Near-Zero Metasurface. IEEE Access, 6. 72015 - 72024.

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Abstract

© 2013 IEEE. In this paper, a wideband, miniaturized, and high gain double-slot Vivaldi antenna is proposed. First, a corner cutting technique is adopted to broaden the frequency band. Second, a pair of defected ground slots is added to the edges of the antenna to extend the low-end frequency limitation from 2.27 to 1.15 GHz, which provides a great design freedom. Third, a novel unit cell of an index-near-zero metasurface is proposed in our design. The unit cell is a two-stub-loaded split-ring resonator, which has a compact size, a wide frequency band, and a good reflection coefficient. The gain of the double-slot Vivaldi antenna is improved over a wide frequency band by the inclusion of the index-near-zero metasurface in the aperture, without changing the overall dimensions or compromising the whole frequency band performance of the antenna. Finally, to verify the design method, an ultra-wideband double-slot Vivaldi antenna with defected ground slots and metasurface was fabricated and measured. The circuit has an overall size of 0.76,λ g × 0.41 λ g × 0.005 λ g. The modified antenna exhibits a measured gain of 0.7-14 dBi over the frequency band of 1.13-12 GHz.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 14 Jan 2019 10:14
Last Modified: 17 Jul 2022 11:41
DOI: 10.1109/ACCESS.2018.2883097
URI: https://livrepository.liverpool.ac.uk/id/eprint/3031230