4.7 Article

An Ultrawideband and High-Gain Antenna Based on 3-D Impedance-Matching Metamaterial Lens

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 69, 期 6, 页码 3084-3093

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3037751

关键词

Lenses; Indexes; Three-dimensional displays; Metamaterials; Ultra wideband antennas; Horn antennas; Antennas; Impedance-matching; metamaterial lens; high gain; high aperture efficiency; ultrawideband

资金

  1. National Key Research and Development Program of China [2017YFA0700201, 2017YFA0700202, 2017YFA0700203]
  2. National Science Foundation of China [61871127, 61890544, 61801117, 61735010, 61731010, 61722106, 61701107, 61701108, 61631007]
  3. 111 Project [111-2-05]
  4. Fund for International Cooperation and Exchange of the National Natural Science Foundation of China [61761136007]

向作者/读者索取更多资源

This article introduces an ultrawideband and high-gain antenna based on a 3-D impedance-matching metamaterial lens, showing significant performance advantages in ultrawide bandwidth and gain enhancement.
In this article, we present an ultrawideband and high-gain antenna based on a 3-D impedance-matching metamaterial (IMM) lens. First, we design a 3-D IMM lens which can convert spherical-like waves to plane ones and is nearly perfect impedance-matching with the free space. To realize the 3-D lens, we propose and design two kinds of ultrawideband sandwich-structured metamaterial unit cells that can cover the refraction index ranges from 1.25 to 1.4 and from 1.4 to 3.8, respectively. We also design a double-ridged pyramid horn antenna as an ultrawideband feed source. Measured results verify that the presented lens antenna can work in an ultrawide bandwidth from 5.2 to 15.13 GHz, and the relative bandwidth is 97.7%. Moreover, it achieves a high aperture efficiency of more than 66% from 5.2 to 14.3 GHz, with a relative bandwidth of 93.3%. A maximum aperture efficiency of 85.6% is obtained at 11.5 GHz. The proposed lens antenna has an average of 2 dB gain enhancement versus optimal horn with the same aperture area. And the length of the lens antenna reduces to 22% compared to a bare horn antenna with the same gain and aperture efficiency.

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