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Quality improvement of millimeter-wave imaging systems using optimized dual polarized arrays

Rezaei, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1109/TAP.2021.3076278
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2021
  4. Abstract:
  5. In this article, we propose a software-hardware system to improve the quality of image recovery in millimeter-wave (MMW) imaging systems, which aims to benefit from copolarization and cross-polarization scatterings from the target. The proposed dual-polarized antenna array structures consist of two orthogonal subarrays with the same phase center, where each subarray is comprised of 2 imes 1 or 4 imes 1 rectangular edge fed patches and the optimized ground defects. These compact structures, which support radiation of two orthogonal linear polarizations, are designed on a single-layer board using crossover technique. The dual-polarized scattering from the target is captured by the orthogonal subarrays. Furthermore, we introduce a method to combine data obtained from measured dual (co- and cross-) polarized fields to improve the recovery of edge information and increase image quality. The proposed single-layer designs have been fabricated and measured, which exhibits high port isolation and high polarization purity. The cross-polarization level is at least 22 and 25 dB lower than the copolarization pattern for 2 imes 1 and 4 imes 1 arrays, respectively. The measured 10 dB impedance bandwidth of the 2 imes 1 and 4 imes 1 subarrays ranges from 27 to 29.3 GHz and from 27 to 29.5 GHz, respectively. Moreover, the radiation gains of the 2 imes 1 and 4 imes 1 subarrays are 9.7 and 12 dBi, respectively. The simulated and measured imaging results show that the cross-polarized data preserve the edge information. Moreover, by using the proposed data combination technique, the quality of the recovered image is improved. © 1963-2012 IEEE
  6. Keywords:
  7. Antenna arrays ; Imaging systems ; Millimeter waves ; Polarization ; Slot antennas ; Cross-polarization level ; Dual polarized antennas ; Dual-polarized array ; High port isolations ; Impedance bandwidths ; Millimeter wave (MMW) ; Millimeter-wave imaging systems ; Polarization patterns ; Image enhancement
  8. Source: IEEE Transactions on Antennas and Propagation ; Volume 69, Issue 10 , 2021 , Pages 6848-6856 ; 0018926X (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/9423529