Journal ArticleDOI
Reflection phase characterizations of the EBG ground plane for low profile wire antenna applications
Fan Yang,Yahya Rahmat-Samii +1 more
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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.read more
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Proceedings ArticleDOI
A low profile surface wave antenna equivalent to a vertical monopole antenna
TL;DR: In this paper, a surface wave antenna that can radiate vertical monopole type patterns with a low profile configuration is presented. But the antenna is only 0.02 /spl lambda/ above the artificial ground plane.
Journal ArticleDOI
High Impedance Surfaces Based Antennas for High Data Rate Communications at 40 GHz
Cuong-Manh Tran,Habiba Hafdallah-Ouslimani,Luyang Zhou,Alain C. Priou,Herve Teillet,Jean-Yves Daden,and Abdelwaheb Ourir +6 more
Abstract: Millimeter wave High Impedance Surfaces (HIS) based antennas are designed, fabricated, and characterized for high data rate communications at frequencies around 40GHz. HIS with difierent flnite surface area sizes are used as a ground plane for the microstrip patch antennas to suppress the surface waves. The antenna measurements and full wave electromagnetic simulations demonstrate a wide bandwidth of 12{15% in the frequency range of 38{44GHz with a high gain of »6dB and a very low cross polar contribution better than i20dB.
EBG Structures Properties and their Application to Improve Radiation of a Low Profile Antenna
TL;DR: In this paper, the characteristics of a mushroom-like EBG structure and performance of a low profile antenna over it were analyzed and its electromagnetic properties were derived, which has more compact electrical dimensions.
Proceedings ArticleDOI
Bandwidth enhancement using dual-band frequency selective surface with Jerusalem cross elements for 2.4/5.8 GHz WLAN antennas
TL;DR: The U-slot patch antenna using a FSS with Jerusalem cross elements has been proven to provide dual-band and wide-band operation for WLAN applications.
Journal ArticleDOI
Optimal design of dipole antennas backed by a finite high-impedance screen
TL;DR: In this article, the performance of a short dipole antenna closely located above a flnite high-Impedance surface (HIS) is addressed, and the antenna behavior is thoroughly analyzed in the frequency range up to the HIS resonance within the region where the propagation of the TE surface waves is not allowed.
References
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Proceedings Article
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