Faenzi Marco, Minatti Gabriele, González-Ovejero David, Caminita Francesco, Martini Enrica, Della Giovampaola Cristian, Maci Stefano
Department of Information Engineering and Mathematics, University of Siena, Via Roma 56, 53100, Siena, Italy.
Wave Up s.r.l., Via Roma 77, 53100, Siena, Italy.
Sci Rep. 2019 Jul 15;9(1):10178. doi: 10.1038/s41598-019-46522-z.
This paper presents new designs, implementation and experiments of metasurface (MTS) antennas constituted by subwavelength elements printed on a grounded dielectric slab. These antennas exploit the interaction between a cylindrical surface wave (SW) wavefront and an anisotropic impedance boundary condition (BC) to produce an almost arbitrary aperture field. They are extremely thin and excited by a simple in-plane monopole. By tailoring the BC through the shaping of the printed elements, these antennas can be largely customized in terms of beam shape, bandwidth and polarization. In this paper, we describe new designs and their implementation and measurements. It is experimentally shown for the first time that these antennas can have aperture efficiency up to 70%, a bandwidth up to 30%, they can produce two different direction beams of high-gain and similar beams at two different frequencies, showing performances never reached before.
本文介绍了由印刷在接地电介质平板上的亚波长元件构成的超表面（MTS）天线的新设计、实现和实验。这些天线利用圆柱表面波（SW）波前与各向异性阻抗边界条件（BC）之间的相互作用来产生几乎任意的孔径场。它们极其薄，并由简单的平面单极子激励。通过对印刷元件进行整形来定制边界条件，这些天线在波束形状、带宽和极化方面可以进行很大程度的定制。在本文中，我们描述了新设计及其实现和测量。首次通过实验表明，这些天线的孔径效率可达70%，带宽可达30%，它们可以在两个不同频率产生两个不同方向的高增益波束以及类似波束，展现出前所未有的性能。
