Grating-lobe Mitigation Using Parasitic Scatterers and Principal Component Analysis

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This paper 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 and strives to maximize realized gain towards grating-lobe-free scan directions. The developed method is demonstrated at 5GHz by both electromagnetic simulations and prototype measurements using a 3-by-3 element antenna array with one-wavelength inter-element 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 languageEnglish
JournalIEEE Transactions on Antennas and Propagation
Publication statusE-pub ahead of print - 2023
MoE publication typeA1 Journal article-refereed


  • Antenna array
  • grating lobe
  • parasitic element
  • principal component analysis
  • sparse antenna array


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