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    The directivity of a compact antenna: an unforgettable figure of merit

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    Author
    Ziolkowski, Richard W. cc
    Affiliation
    Univ Arizona, Dept Elect & Comp Engn
    Issue Date
    2017-10-11
    Keywords
    Directivity
    Electrically small antennas
    Huygens source
    Metamaterial-inspired antennas
    Patch antennas
    
    Metadata
    Show full item record
    Publisher
    EDP SCIENCES S A
    Citation
    The directivity of a compact antenna: an unforgettable figure of merit 2017, 4:7 EPJ Applied Metamaterials
    Journal
    EPJ Applied Metamaterials
    Rights
    © R.W. Ziolkowski, published by EDP Sciences, 2017. This is an Open Access article distributed under the terms of the Creative Commons Attribution License.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    When an electrically small antenna is conceived, designed, simulated, and tested, the main emphasis is usually placed immediately on its impedance bandwidth and radiation efficiency. All too often it is assumed that its directivity will only be that of a Hertzian dipole and, hence, its directivity becomes a minor consideration. This is particularly true if such a compact antenna radiates in the presence of a large ground plane. Attention is typically focused on the radiator and its size, while the ground plane is forgotten. This has become a too frequent occurrence when antennas, such as patch antennas that have been augmented with metamaterial structures, are explored. In this paper, it is demonstrated that while the ground plane has little impact on the resonance frequency and impedance bandwidth of patch antennas or metamaterial-inspired three-dimensional magnetic EZ antennas, it has a huge impact on their directivity performance. Moreover, it is demonstrated that with both a metamaterial-inspired two-element array and a related Huygens dipole antenna, one can achieve broadside-radiating electrically small systems that have high directivities. Several common and original designs are used to highlight these issues and to emphasize why a fundamental figure of merit such as directivity should never be overlooked.
    Note
    Open Access Journal.
    ISSN
    2272-2394
    DOI
    10.1051/epjam/2017006
    Version
    Final published version
    Additional Links
    http://epjam.edp-open.org/10.1051/epjam/2017006
    ae974a485f413a2113503eed53cd6c53
    10.1051/epjam/2017006
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