Near-Field Bessel-Gauss Antenna for Non-Metal Internal Defects Detection

Xiaoqing Yang, Weize Li, Ping Lu, Qian Liu, Ying Zou, Yi Xie, Chaoyun Song, Yunfeng Qiu

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A Radial Line Slot Array (RLSA) is proposed for Bessel-Gauss beam generation with a narrow main beamwidth and low sidelobe characteristics for non-metallic internal defects detection. Owing to the radial attenuation factor of Gaussian function, the sidelobe level of Bessel-Gauss beam can be suppressed. By accurately adjusting the slot position and size of the RLSA, the optimum aperture field distribution can be synthesized to generate the near-field Bessel-Gauss beam based on the projection method. The simulated/measured results have shown that the maximum non-diffraction distance of 70mm/70mm and the null-null beam width (NNBW) of the Bessel-Gauss main beam of 30mm/30mm are achieved at the operating frequency of 12.5 GHz/12.5 GHz, whilst low sidelobe levels (<-18.14dB/-18.07dB) are generated. Compared to other antennas for microwave nondestructive testing (NDT), the proposed RLSA has merits of low sidelobes, large E-field depth and narrow main beam, therefore it can improve the detection performance in terms of sensitivity and depth, which can be widely used for non-metal internal defects detection applications.

Original languageEnglish
JournalIEEE Antennas and Wireless Propagation Letters
Publication statusE-pub ahead of print - 24 Sep 2021


  • Antennas
  • Bessel-Gauss Beam
  • Frequency measurement
  • Low sidelobes
  • Microwave antennas
  • Microwave communication
  • Microwave nondestructive testing
  • Microwave propagation
  • Microwave theory and techniques
  • Non-metal detection
  • Projection method
  • Radial Line Slot Array (RLSA)
  • Sensitivity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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