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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 Low-RCS and Wideband Circularly Polarized Patch Array Based on Metasurface

TL;DR: In this paper, a novel circularly polarized array antenna based on metasurface (MS) is designed to realize wideband radar cross section (RCS) reduction, wideband operation and high gain.
Journal ArticleDOI

Slow‐wave characteristics of a 1D EBG structure for a miniaturized monopole antenna

TL;DR: In this paper, a 1D EBG cell was used to reduce the group velocity of the electric pulse propagating along the coplanar waveguides loaded with the 1D bandgap cell.
Journal ArticleDOI

Dual band circular polarized bow tie slotted patch antenna over high impedance surface for WiMAX application

TL;DR: In this article, a planar dual-band bow-tie slotted patch antenna backed by high-impedance surface (HIS) is designed at 2.5 and 3.5 GHz for wireless application.
Book ChapterDOI

Modern Small Antennas: Design and practice of small antennas I

TL;DR: In this article, the authors describe practical design and examples of small antennas, including the use of slow wave structure Meander line antennas (MLA) for various small wireless systems such as mobile phones, digital TV receivers, RFID, and so forth.
References
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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

Experimental Verification of a Negative Index of Refraction

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Journal ArticleDOI

High-impedance electromagnetic surfaces with a forbidden frequency band

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Proceedings Article

Photonic crystals

TL;DR: In this paper, the authors describe photonic crystals as the analogy between electron waves in crystals and the light waves in artificial periodic dielectric structures, and the interest in periodic structures has been stimulated by the fast development of semiconductor technology that now allows the fabrication of artificial structures, whose period is comparable with the wavelength of light in the visible and infrared ranges.
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