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    Bandwidth requirement for suppression of grating lobes in ultrawideband antenna arrays

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    Authors
    Sipal, Vit
    Edwards, David J.
    Allen, Ben
    Affiliation
    University of Oxford
    Issue Date
    2012-09
    Subjects
    antenna arrays
    frequency modulation
    gratings
    narrowband
    ultra wideband antennas
    ultrawideband (UWB)
    
    Metadata
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    Abstract
    Sparse ultrawideband antenna arrays suppress the grating lobes due to the fact that the duration of pulses processed by individual antenna elements is too short to constructively superpose them in the time domain. Such arrays represent an attractive option for design of many low-comlexity low-cost ultrawideband systems, where narrow beamwidth is achieved by increase of element spacing. This paper empirically explores the minimum bandwidth required for suppression of the grating lobes. It is found that the relative bandwidth required to suppress grating lobes is independent on the centre frequency, element spacing, and number of elements. There is a weak dependency of the bandwidth on the type of the pulse used, but the general conclusion is that the relative bandwidth has to exceed 100% in order to suppress the grating lobes. It is, however, noted that whilst sparse array with a low number of antenna elements can suppress the grating lobes and posses a narrow beam, the compromise for this feature is a reduction of the level of spatial filtering between the main lobe and other directions, when compared to arrays where grating lobes are suppressed by dense spacing.
    Citation
    Sipal, V., Edwards, D., Allen, B. (2012) 'Bandwidth requirement for suppression of grating lobes in ultrawideband antenna arrays', Ultra-Wideband (ICUWB), 2012 IEEE International Conference on: 236-240 Syracuse, NY
    Publisher
    IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
    URI
    http://hdl.handle.net/10547/274568
    DOI
    10.1109/ICUWB.2012.6340438
    Additional Links
    http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6340438
    Type
    Conference papers, meetings and proceedings
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1109/ICUWB.2012.6340438
    Scopus Count
    Collections
    Centre for Wireless Research (CWR)

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