Super-Resolution Information in Electromagnetic Inverse Scattering

Fan, Qimeng; Yin, Chengyou; Xu, Ziqiang

doi:10.23919/apmc.2018.8617653

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Actually, there exist super oscillation in the OAM-carrying waves, which can transform the information about the evanescent waves of the targets into far field measurements. Thus, we can recover more details of the targets with the evanescent information [22]. The second one processes the measured data with a priori information, such as the targets number, the location of the targets, the value of the contrast, etc.…”

Section: Theorymentioning

confidence: 99%

Accurate Recovery of Sparse Objects With Perfect Mask Based on Joint Sparse Reconstruction

2019

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Accurate inversion of high-contrast objects is of great interest to many researchers. In this paper, we reconstruct sparse high-contrast targets perfectly based on the joint sparse reconstruction and the contrast source inversion (CSI). First, the targets number is estimated accurately with the minimum description length (MDL) criterion. Second, with the exact targets number as a priori information, the supports of the targets are perfectly recovered based on the joint-sparse structure of the contrast sources under a multiple measurement vector (MMV) scheme. Finally, the contrast is perfectly reconstructed with the CSI method, in which a priori information about the accurate supports is added. The perfect mask is such strong a priori information that the reconstruction is enforced to locate on the positions of real targets, enormously enhancing the rebuilding quality. Perfect reconstructions of sparse objects with high contrast are demonstrated under various scenarios, showing effectiveness and robustness of the proposed method. Moreover, limitations of the proposed method are discussed, which explains the difference of success rate of accurate reconstruction with different mesh sizes from a physical insight. INDEX TERMS Compressive sensing, contrast source inversion (CSI), electromagnetic inverse scattering, joint sparse, perfect mask.

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Section: Theorymentioning

confidence: 99%

Accurate Recovery of Sparse Objects With Perfect Mask Based on Joint Sparse Reconstruction

2019

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“…The electromagnetic (EM) wave carrying OAM has a helical phase structure of e −jlφ , where φ is the transverse azimuthal angle, and l represents the topological charge of the OAM mode. Due to the infinite number of OAM modes and the orthogonality between different OAM modes [2], [3], OAM has excellent performances in manipulating particles [4], [5], quantum information processing [6], and communication systems [7]- [12] and imaging systems [13]- [16]. However, no realistic system can ever generate infinite OAM modes.…”

Section: Introductionmentioning

confidence: 99%

Broad-Band Multiple OAMs’ Generation With Eight-Arm Archimedean Spiral Antenna (ASA)

et al. 2020

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In this paper, an eight-arm Archimedean spiral antenna (ASA) is proposed to generate multiple orbital angular momentum (OAM) modes over a respectable frequency band (1.9-3GHz). Firstly, the principle of radiation by eight-arm ASA with right-hand spiral line is analyzed and simulated. It is demonstrated that the OAM modes and polarizations of the generated vortex waves are reconfigurable by changing the fed phases of the eight arms and controlling the radius of the antenna arm. Meanwhile, a prototype is fabricated and measured, in which experimental results agree well with simulation ones. At last, compared with other recently reported OAM-generating antennas, the proposed antenna with the smaller structure (2.45λ 0 , where λ 0 is the wavelength of the center frequency) can produce the higher gain (4.5-11.2dBi) vortex waves carrying multiple OAM modes (five modes) in the broad band of 1.9-3GHz. INDEX TERMS Archimedean spiral antenna (ASA), left-hand circularly polarized (LCP), right-hand circularly polarized (RCP), orbital angular momentum (OAM), vortex wave.

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Inverse scattering problem by the use of vortex Bessel beams

Balandin,

Kaneko

2024

Z. Angew. Math. Phys.

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Super-Resolution Information in Electromagnetic Inverse Scattering

Cited by 3 publications

References 10 publications

Accurate Recovery of Sparse Objects With Perfect Mask Based on Joint Sparse Reconstruction

Accurate Recovery of Sparse Objects With Perfect Mask Based on Joint Sparse Reconstruction

Broad-Band Multiple OAMs’ Generation With Eight-Arm Archimedean Spiral Antenna (ASA)

Inverse scattering problem by the use of vortex Bessel beams

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