NDLI: A uni-directional ring-slot antenna achieved by using an electromagnetic band-gap surface

Content Provider	IEEE Xplore Digital Library
Author	Elek, F. Abhari, R. Eleftheriades, G.V.
Copyright Year	1963
Abstract	Slot antennas offer a number of advantages including low-profile, ease of fabrication, and ease of integration with electronics. Their main drawback, however, is that they are inherently bi-directional radiators. One common technique to redirect the back radiation forward is to place a conducting reflector at a fixed distance away from the antenna. This distance is usually chosen to be a quarter wavelength so that the reflected back radiation incurs an additional phase of 360/spl deg/ and thus adds in phase with the forward directed radiation. However, in this case the parallel-plate geometry permits the excitation of the dominant transverse electromagnetic mode, which drastically reduces the overall radiation efficiency. This work describes a solution to this problem and shows how to achieve uni-directional slot antenna elements by backing them with an electromagnetic band-gap surface, instead of the uniform conducting reflector. This structure, when operated in its band-gap, inhibits the propagation of electromagnetic waves over all possible azimuthal directions, in the region between the antenna ground plane and the periodic surface.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	181
Ending Page	190
Page Count	10
File Size	605582
File Format	PDF
ISSN	0018926X
Volume Number	53
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Periodic structures Slot antennas Reflector antennas Electromagnetic radiation Antennas and propagation Fabrication Bidirectional control Geometry Photonic band gap Electromagnetic propagation slot antennas Band-gap periodic structures
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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