Grating-Lobe Mitigation Using Parasitic Scatterers and Principal Component Analysis

Albert Salmi; Jan Bergman; Anu Lehtovuori; Juha Ala-Laurinaho; Ville Viikari

doi:10.1109/TAP.2023.3333569

Grating-Lobe Mitigation Using Parasitic Scatterers and Principal Component Analysis

Albert Salmi^*
, Jan Bergman
, Anu Lehtovuori
, Juha Ala-Laurinaho
, Ville Viikari

^*Corresponding author for this work

Not published at VTT

Aalto University

Research output: Contribution to journal › Article › Scientific › peer-review

9 Citations (Scopus)

Abstract

This communication presents a method for suppressing grating lobes that occur in sparse antenna arrays. The method is based on parasitic antenna elements that are terminated to reactive loads. The loads are computed using a computationally efficient algorithm that is based on principal component analysis (PCA) and strives to maximize realized gain toward grating-lobe-free (GL-free) scan directions. The developed method is demonstrated at 5 GHz by both electromagnetic simulations and prototype measurements using a 3×3 element antenna array with one-wavelength interelement distances. The example shows that the grating-lobe level is suppressed by 8.4 dB, and the main beam gain is increased by 3.9 dB compared to an array without parasitic scatterers.

Original language	English
Pages (from-to)	1995-2000
Journal	IEEE Transactions on Antennas and Propagation
Volume	72
Issue number	2
DOIs	https://doi.org/10.1109/TAP.2023.3333569
Publication status	Published - 1 Feb 2024
MoE publication type	A1 Journal article-refereed

Funding

This work was supported by the Business Finland through ENTRY100 GHz CELTIC-NEXT Project. The work of Albert Salmi was supported by Walter Ahlstrom Foundation. The work of Jan Bergman was supported in part by Walter Ahlstrom Foundation and in part by Helsingin Puhelinyhdistys (HPY) Research Foundation.

Keywords

Antenna array
grating lobe
parasitic element
principal component analysis (PCA)
sparse antenna array

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10.1109/TAP.2023.3333569

Cite this

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abstract = "This communication presents a method for suppressing grating lobes that occur in sparse antenna arrays. The method is based on parasitic antenna elements that are terminated to reactive loads. The loads are computed using a computationally efficient algorithm that is based on principal component analysis (PCA) and strives to maximize realized gain toward grating-lobe-free (GL-free) scan directions. The developed method is demonstrated at 5 GHz by both electromagnetic simulations and prototype measurements using a 3×3 element antenna array with one-wavelength interelement distances. The example shows that the grating-lobe level is suppressed by 8.4 dB, and the main beam gain is increased by 3.9 dB compared to an array without parasitic scatterers.",

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AB - This communication presents a method for suppressing grating lobes that occur in sparse antenna arrays. The method is based on parasitic antenna elements that are terminated to reactive loads. The loads are computed using a computationally efficient algorithm that is based on principal component analysis (PCA) and strives to maximize realized gain toward grating-lobe-free (GL-free) scan directions. The developed method is demonstrated at 5 GHz by both electromagnetic simulations and prototype measurements using a 3×3 element antenna array with one-wavelength interelement distances. The example shows that the grating-lobe level is suppressed by 8.4 dB, and the main beam gain is increased by 3.9 dB compared to an array without parasitic scatterers.

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KW - parasitic element

KW - principal component analysis (PCA)

KW - sparse antenna array

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Grating-Lobe Mitigation Using Parasitic Scatterers and Principal Component Analysis

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