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PIER PIER B PIER C PIER M PIER Letters
2011-09-06
Broadband and High-Gain Planar Vivaldi Antennas Based on Inhomogeneous Anisotropic Zero-Index Metamaterials
By
Bin Zhou,

    Dr. Bin Zhou

    School of Information Science and Engineering

    Southeast University

    China

    Homepage

Hui Li,

    Dr. Hui Li

    School of Information Science and Engineering

    Southeast University

    China

    Homepage

Xiaying Zou,

    Dr. Xiaying Zou

    School of Information Science and Engineering

    Southeast University

    China

    Homepage

Tie-Jun Cui

    Professor Tie-Jun Cui

    Department of Radio Engineering

    Southeast University

    China

    Homepage

Progress In Electromagnetics Research, Vol. 120, 235-247, 2011
doi:10.2528/PIER11072710
Abstract
Vivaldi antennas have broad applications in real practice due to the ultra wideband properties. However, their gain and directivity are relatively low. In this paper, a new method is presented to improve the gain and directivity of Vivaldi antennas in a broad band using inhomogeneous and anisotropic (IA) zero-index metamaterials (ZIM). ZIM have the ability to enhance the antenna directivity; anisotropic ZIM with only one component of the permittivity or permeability tensor approaching to zero can make impedance match to improve the radiation efficiency; and IA-ZIM can broaden the frequency bandwidth. Single- and multiple-layered planar IA-ZIM have been analyzed, designed, and fabricated, which can be embedded into the original Vivaldi antenna smoothly and compactly. The IA-ZIM-based Vivaldi antennas have good features of high gain, high directivity, low return loss, and broad bandwidth. Compared to the original Vivaldi antenna, the measurement results show that the gain has been increased by 3 dB and the half-power beam width has been decreased by 20 degrees with the reflection coefficient less than -10 dB from 9.5 GHz to 12.5 GHz after using IA-ZIM.
Citation
Bin Zhou, Hui Li, Xiaying Zou, and Tie-Jun Cui, "Broadband and High-Gain Planar Vivaldi Antennas Based on Inhomogeneous Anisotropic Zero-Index Metamaterials," Progress In Electromagnetics Research, Vol. 120, 235-247, 2011.
doi:10.2528/PIER11072710
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