The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a rigorous analysis of the input impedance of a monopole antenna surrounded by a finite-height tensor impedance surface coating using the modal-expansion method. The tensor impedance surface is approximated by a thin anisotropic slab for facilitating the analysis. In addition, practical coaxial feedline was considered in the modeling. Based on the field expressions for all the...
Metasurfaces, which are quasi-two-dimensional (quasi-2D) textured surfaces comprised of a periodic or aperiodic array of sub-wavelength building blocks, provide a fully-planarized platform for controlling the propagation, radiation, and scattering of electromagnetic waves. Compared to their three-dimensional (3D) metamaterial counterparts, 2D metasurfaces offer several advantages including lower losses,...
In this paper, we present the design, fabrication, and measurement of a compact circularly-polarized conformai antenna employing a finite-sized anisotropic artificial ground plane. The antenna structure consists of a loop monopole on the top and a metallic sheet backed truncated metasurface on the bottom, which are separated by a foam spacer. The metasurface contains an array of two by two loop resonators...
A dual-band short backfire antenna with high aperture efficiency for satellite communications is presented. The high aperture efficiency is enabled by loading anisotropic impedance metasurfaces (AIMs) to the cavity walls of a hexagonal short backfire antenna fed by a slot-loaded suspended patch. By optimizing the surface impedance values of the AIM loadings, the achieved aperture efficiency averaged...
In this paper a newly designed metasurface (MS) loaded miniaturized antenna is proposed and simulated. The double layered MS loaded with complementary split ring resonators (CSRRs) acts as the ground plane for a planar feeding monopole antenna. The antenna has a compact footprint of 0.11λ02 and a thickness of 0.07 λ0. The simulation results show that a wide −10 dB S11 bandwidth of 9% is realized....
In this paper, we present the design, fabrication, and experimental validation of a low-profile and compact metasurface-based conformal wearable antenna operating in the medical body area network (MBAN) band. In particular, a metal backed finite-sized metasurface consisting of a two by two array of I-shaped resonators was employed to replace the conventional ground plane, which enables a low-profile...
In this paper, the authors present an impedance-matched low loss infrared zero index metamaterials (ZIM) with a wide field-of-view. The ZIM structure is optimized by a genetic algorithm combined with a generalized inversion method capable of retrieving the effective anisotropic constitutive parameters of the metamaterial with its angular response considered.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.