TY - JOUR
T1 - Near-Field Bessel-Gauss Antenna for Non-Metal Internal Defects Detection
AU - Yang, Xiaoqing
AU - Li, Weize
AU - Lu, Ping
AU - Liu, Qian
AU - Zou, Ying
AU - Xie, Yi
AU - Song, Chaoyun
AU - Qiu, Yunfeng
N1 - Funding Information:
This work was supported in part by the Guizhou Aerospace Institute of Measuring and Testing Technology under Grant HG2020192, Grant JZX7J20191201ZL0002; in part by Defense Technology Innovation Rapid Response Team under Grant 19-163-00-KX- 002-016-02; in part by the National Natural Science Foundation of China under Grant 51907130; in part by Sichuan Science and Technology Program: Provincial Overseas Cooperation under Grant 2020YFH0091; and in part by Chengdu Science and Technology Program underGrant 2020-GH02-00036-HZ.
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2021/12
Y1 - 2021/12
N2 - A radial line slot array (RLSA) is proposed for Bessel-Gauss beam generation with a narrow main beamwidth and low sidelobe characteristics for nonmetallic 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 nondiffraction distance of 70 mm/70 mm and the null-null beam width of the Bessel-Gauss main beam of 30 mm/30 mm are achieved at the operating frequency of 12.5 GHz/12.5 GHz, while low sidelobe levels (<-18.14 dB/-18.07 dB) are generated. Compared to other antennas for microwave nondestructive testing, 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 nonmetal internal defects detection applications.
AB - A radial line slot array (RLSA) is proposed for Bessel-Gauss beam generation with a narrow main beamwidth and low sidelobe characteristics for nonmetallic 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 nondiffraction distance of 70 mm/70 mm and the null-null beam width of the Bessel-Gauss main beam of 30 mm/30 mm are achieved at the operating frequency of 12.5 GHz/12.5 GHz, while low sidelobe levels (<-18.14 dB/-18.07 dB) are generated. Compared to other antennas for microwave nondestructive testing, 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 nonmetal internal defects detection applications.
KW - Bessel-Gauss beam
KW - low sidelobes
KW - microwave nondestructive testing (NDT)
KW - nonmetal detection
KW - projection method
KW - radial line slot array (RLSA)
UR - http://www.scopus.com/inward/record.url?scp=85115808520&partnerID=8YFLogxK
U2 - 10.1109/LAWP.2021.3115166
DO - 10.1109/LAWP.2021.3115166
M3 - Article
AN - SCOPUS:85115808520
SN - 1536-1225
VL - 20
SP - 2466
EP - 2470
JO - IEEE Antennas and Wireless Propagation Letters
JF - IEEE Antennas and Wireless Propagation Letters
IS - 12
ER -