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2025-03-06

Fast Low Sidelobe Pattern Synthesis of Planar Arrays Having a Distorted Triangular or Rectangular Lattice Due to Row Displacements

Will Keizer

Mr. Will Keizer

ArraySoft

The Netherlands

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Progress In Electromagnetics Research M, Vol. 132, 85-94, 2025

doi:10.2528/PIERM25010203

Abstract

This paper describes the low sidelobe pattern synthesis of planar arrays having a distorted triangular or rectangular lattice. This distortion concerns variable row displacements applied to a triangular, skew or rectangular element lattice. The applied low sidelobe pattern synthesis is based on the iterative Fourier transform (IFT) method that makes extensive use of forward and inverse FFTs. Recently this author has developed new forward and inverse 2D FFT formulations. Due to these two new FFT formulations, the application of the IFT method is no longer limited to the pattern synthesis of a planar array having a rectangular lattice but can now also be applied to array apertures with a triangular or skew element lattice and even when such lattice has displaced element rows. The new IFT method is employed in this paper for the low sidelobe pattern synthesis of arrays featuring displaced element rows. The presented synthesized pattern results, which refer to the sum pattern, concern three planar arrays each with displaced element rows applied to a square or triangular lattice. The sum pattern of the considered antennas has to meet peak sidelobe level (PSLL) requirements for two nulling ring sectors, one of ≤-50 dB and the other of ≤-68 dB. The sum pattern of the third example includes a rectangular nulling sector specified by a PSLL of <– 80 dB.

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Will Keizer, "Fast Low Sidelobe Pattern Synthesis of Planar Arrays Having a Distorted Triangular or Rectangular Lattice Due to Row Displacements," Progress In Electromagnetics Research M, Vol. 132, 85-94, 2025.
doi:10.2528/PIERM25010203

References

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