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Journal ArticleDOI

Reflection phase characterizations of the EBG ground plane for low profile wire antenna applications

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TLDR
In this article, the authors focus on the reflection phase feature of EBG surfaces, which can be used to identify the input-match frequency band inside of which a low profile wire antenna exhibits a good return loss.
Abstract
Mushroom-like electromagnetic band-gap (EBG) structures exhibit unique electromagnetic properties that have led to a wide range of electromagnetic device applications. This paper focuses on the reflection phase feature of EBG surfaces: when plane waves normally illuminate an EBG structure, the phase of the reflected field changes continuously from 180/spl deg/ to -180/spl deg/ versus frequency. One important application of this feature is that one can replace a conventional perfect electric conductor (PEC) ground plane with an EBG ground plane for a low profile wire antenna design. For this design, the operational frequency band of an EBG structure is defined as the frequency region within which a low profile wire antenna radiates efficiently, namely, having a good return loss and radiation patterns. The operational frequency band is the overlap of the input-match frequency band and the surface-wave frequency bandgap. It is revealed that the reflection phase curve can be used to identify the input-match frequency band inside of which a low profile wire antenna exhibits a good return loss. The surface-wave frequency bandgap of the EBG surface that helps improve radiation patterns is very close to its input-match frequency band, resulting in an effective operational frequency band. In contrast, a thin grounded slab cannot work efficiently as a ground plane for low profile wire antennas because its surface-wave frequency bandgap and input-match frequency band do not overlap. Parametric studies have been performed to obtain design guidelines for EBG ground planes. Two novel EBG ground planes with interesting electromagnetic features are also presented. The rectangular patch EBG ground plane has a polarization dependent reflection phase and the slotted patch EBG ground plane shows a compact size.

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Citations
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Journal ArticleDOI

A novel radar‐absorbing‐material based on EBG structure

TL;DR: In this paper, a novel ultra-thin radar-absorbing material (RAM) using metamaterials is presented and the absorption performance is examined and the thickness of the RAM is about several tenths of the center wavelength of the absorption band.
Journal ArticleDOI

Circular High-Impedance Surfaces Characterization

TL;DR: In this paper, the reflection phase characterization used for rectangular high-impedance surfaces was extended to circular lattices and the effect of mapping a rectangular HIS into a circular one was investigated in order to give some insights regarding the design of such metasurface.
Journal ArticleDOI

Reflection characteristics of 1-d ebg ground plane and its application to a planar dipole antenna

TL;DR: In this article, a 1-dimensional electromagnetic bandgap (1-D EBG) ground plane was designed and characterized, which is applied to the design of low-proflle directive dipole antennas.
Journal ArticleDOI

Analysis, Design, and Measurements of Circularly Symmetric High-Impedance Surfaces for Loop Antenna Applications

TL;DR: In this article, a new wideband circular high-impedance surface (HIS) is proposed and two models are developed to analyze the reflection characteristics of the proposed HIS, and it is shown through simulations that a circular HIS as a ground plane for loop antennas is superior to a rectangular HIS ground plane.
Patent

RFID tag and antenna

TL;DR: In this article, an RFID tag and an antenna are mounted on a band gap substrate having two mushroom-like conductive layers 3, 7 with a dielectric in between.
References
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Journal ArticleDOI

Negative Refraction Makes a Perfect Lens

TL;DR: The authors' simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver, which resolves objects only a few nanometers across.
Journal ArticleDOI

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Journal ArticleDOI

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Proceedings Article

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