BROADBAND AND HIGH-GAIN PLANAR VIVALDI ANTENNAS BASED ON INHOMOGENEOUS ANISOTROPIC ZERO-INDEX METAMATERIALS

被引：106

作者：

Zhou, B. ^{[1
]}

Li, H. ^{[1
]}

Zou, X. Y. ^{[1
]}

Cui, T. J. ^{[1
]}

机构：

[1] Southeast Univ, State Key Lab Millimeter Waves, Sch Informat Sci & Engn, Nanjing 210096, Peoples R China

来源：

PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER | 2011年 / 120卷

基金：

美国国家科学基金会;

关键词：

RADIATION;

D O I：

10.2528/PIER11072710

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：235 / 247

页数：13

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