scholarly journals Uncorrelated configurations and field uniformity in reverberation chambers stirred by reconfigurable metasurfaces

2021 ◽  
Vol 118 (14) ◽  
pp. 144101
Author(s):  
J.-B. Gros ◽  
G. Lerosey ◽  
F. Mortessagne ◽  
U. Kuhl ◽  
O. Legrand
Keyword(s):  
Field Uniformity ◽  
Reverberation Chambers

scholarly journals Parametric Testing of Metasurface Stirrers for Metasurfaced Reverberation Chambers

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 976
Author(s):  
Hengyi Sun ◽  
Changqing Gu ◽  
Zhuo Li ◽  
Qian Xu ◽  
Mengmeng Wei ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Cross Sections ◽  
Correlation Coefficients ◽  
Random Arrangement ◽  
Different Types ◽  
Unit Cells ◽  
Field Uniformity ◽  
Parametric Testing ◽  
Reverberation Chambers ◽  
Scattering Cross Sections

In this paper, the correlation coefficients and the total scattering cross sections (TSCSs) for different types of metasurfaced stirrers and the traditional metallic stirrer, and the effects on field uniformity when such stirrers are used in reverberation chambers, are analyzed. Three metasurfaced stirrers are considered: A stirrer with two unit cells arranged alternatively (#1), a stirrer with two unit cells arranged in a chessboard-like manner (#2), and a stirrer with two unit cells in random arrangement (#3). From the correlation coefficient and TSCS results obtained in simulations, it follows that metasurfaced stirrer #1 is the best option. Field uniformity analysis of the resulting metasurface reverberation chambers (MRC) equipped with the different stirrers also supports this conclusion.

scholarly journals Enhancing the Number of Modes in Metasurfaced Reverberation Chambers for Field Uniformity Improvement

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3301 ◽  
Author(s):  
Hengyi Sun ◽  
Changqing Gu ◽  
Zhuo Li ◽  
Qian Xu ◽  
Jiajia Song ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Unit Cell ◽  
Operating Frequency ◽  
Test Volume ◽  
Low Frequencies ◽  
Modal Density ◽  
Resonance Frequencies ◽  
Different Types ◽  
Field Uniformity ◽  
Reverberation Chambers

The use of metasurfaces to increase the number of modes, lower the operating frequency, and improve the field uniformity in reverberation chambers (RCs) is investigated in this paper. The method used to improve the field uniformity and decrease the resonance frequencies is based on increasing the number of modes by using the concept of subwavelength cavities. The resonance frequencies of a RC with metasurface wall are derived and expressed analytically in terms of macroscopic characteristics. Simulation of the reflection phase of the unit cell is then given as a guideline to choose the required microscopic parameters of the designed metasurface. The mode density in such subwavelength RCs is then obtained using a numerical eigenmode solver. Compared to traditional RCs, a much higher modal density is obtained at low frequencies. The standard deviation of the field uniformity in the test volume of the RC corresponding to different types of metasurface walls is finally compared. It is shown that by increasing the number of modes in the RC at the lower band, the operating frequency decreases and the field uniformity of the RC is improved.

Analysis of field uniformity and quantitative evaluation of subsurface pitting corrosion in conductors via GPEC

2020 ◽  
Vol 64 (1-4) ◽  
pp. 19-29
Author(s):  
Shuting Ren ◽  
Yong Li ◽  
Bei Yan ◽  
Jinhua Hu ◽  
Ilham Mukriz Zainal Abidin ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Eddy Current ◽  
Pitting Corrosion ◽  
Gradient Field ◽  
Uniform Field ◽  
Eddy Current Method ◽  
Optimal Position ◽  
Pulsed Eddy Current ◽  
Field Uniformity ◽  
Processing Algorithms

Structures of nonmagnetic materials are broadly used in engineering fields such as aerospace, energy, etc. Due to corrosive and hostile environments, they are vulnerable to the Subsurface Pitting Corrosion (SPC) leading to structural failure. Therefore, it is imperative to conduct periodical inspection and comprehensive evaluation of SPC using reliable nondestructive evaluation techniques. Extended from the conventional Pulsed eddy current method (PEC), Gradient-field Pulsed Eddy Current technique (GPEC) has been proposed and found to be advantageous over PEC in terms of enhanced inspection sensitivity and accuracy in evaluation and imaging of subsurface defects in nonmagnetic conductors. In this paper two GPEC probes for uniform field excitation are intensively analyzed and compared. Their capabilities in SPC evaluation and imaging are explored through simulations and experiments. The optimal position for deployment of the magnetic field sensor is determined by scrutinizing the field uniformity and inspection sensitivity to SPC based on finite element simulations. After the optimal probe structure is chosen, quantitative evaluation and imaging of SPC are investigated. Signal/image processing algorithms for SPC evaluation are proposed. Through simulations and experiments, it has been found that the T-shaped probe together with the proposed processing algorithms is advantageous and preferable for profile recognition and depth evaluation of SPC.

Research on Characteristics of Field Uniformity in Reverberation Chamber Using Two TX Antennas

2012 ◽  
Vol E95.B (7) ◽  
pp. 2386-2392
Author(s):  
Jung-Hoon KIM ◽  
Tae-Heon JANG ◽  
Sung-Kuk LIM ◽  
Songjun LEE ◽  
Sung-Il YANG
Keyword(s):  
Reverberation Chamber ◽  
Field Uniformity

The Field Uniformity Analysis in a Triangular Prism Reverberation Chamber with a QRD

2011 ◽  
Vol E94-B (1) ◽  
pp. 334-337 ◽  
Author(s):  
Jung-Hoon KIM ◽  
Hye-Kwang KIM ◽  
Eugene RHEE ◽  
Sung-Il YANG
Keyword(s):  
Triangular Prism ◽  
Reverberation Chamber ◽  
Field Uniformity
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