Orbital angular momentum in radio: Measurement methods

Mohammadi, Siavoush M.; Daldorff, L. K. S.; Forozesh, K.; Thidé, Bo; Bergman, J.; Isham, B.; Karlsson, R.; Carozzi, T. D.

doi:10.1029/2009rs004299

Cited by 121 publications

(64 citation statements)

References 27 publications

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“…3d and e, respectively. The measured intensity pattern is quite similar to the simulated one as well as the theoretical result1223. Also, the experimental phase data shows a total 2π phase change around the centre of the plate as expected.…”

Section: Resultssupporting

confidence: 85%

Generation of Electromagnetic Waves with Arbitrary Orbital Angular Momentum Modes

Wang

Hao

2014

Sci Rep

235

110

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Recently, much attention has been focused on beams carrying orbital angular momentum (OAM) for radio communication. Here we experimentally demonstrate a planar-spiral phase plate (planar-SPP) for generating arbitrary mixed OAM beams. This proposed planar-SPP uses the concept of transmit array antenna having a perforated substrate to control the outputting phase for generating beams carrying OAM with arbitrary modes. As demonstrations, three planar-SPPs with a single OAM mode and two mixed OAM modes around 94 GHz have been investigated with design and experiments in this paper, respectively. The typical experimental intensity and phase patterns show that the proposed method of generating OAM beams really works.

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Section: Resultssupporting

confidence: 85%

Generation of Electromagnetic Waves with Arbitrary Orbital Angular Momentum Modes

Wang

Hao

2014

Sci Rep

235

110

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“…Neglect the cross-polarization of the elements, and using Fourier transformed Faraday's law, the OAM mode of the beam can be approximated by only two field components [5] j ≈ −ω Re{xEzEy * / c}dv…”

Section: A Oam Mode Estimationmentioning

confidence: 99%

A novel digital data transmission method using OAM modes

Liu

Cui

Niu

et al. 2015

2015 Asia-Pacific Microwave Conference (APMC)

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Recently researchers found that digital data can be encoded and decoded by different OAM modes. A novel digital data transmission method using orbital angular momentum (OAM) of electromagnetic (EM) fields is proposed in this paper. Firstly, we propose a tolerable encoding method using OAM mode, which is generated by the uniform circular array (UCA). Then, if the beam axis is known, a dual-polarized antenna can be used to measure two electric field components and detect the OAM mode by the approximation method. Finally, the bit-error-rate (BER) against signal-to-noise ratio (SNR) of the proposed method is analyzed.Index Terms-Orbital angular momentum (OAM), uniform circular array (UCA), rotation phase front, bit error rate (BER), signal-to-noise ratio (SNR), Gauss-Laguerre.

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“…The orbital angular momentum (OAM) of electromagnetic (EM) waves has been attracting increasing attention in optics [1] and microwave domains [2,3,4] because it provides a new rotational degree of freedom that is distinct from polarization for information transformation [5]. Hitherto, applications of OAM are mainly concentrated in communications [6,7,8,9] in both optical and radio frequencies, which makes use of the orthogonality of different OAM modes.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Vortex-Based Radar Imaging Using a Single Receiving Antenna: Theory and Experimental Results

Yuan

Wang

Cheng

et al. 2017

Sensors

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Radar imaging based on electromagnetic vortex can achieve azimuth resolution without relative motion. The present paper investigates this imaging technique with the use of a single receiving antenna through theoretical analysis and experimental results. Compared with the use of multiple receiving antennas, the echoes from a single receiver cannot be used directly for image reconstruction using Fourier method. The reason is revealed by using the point spread function. An additional phase is compensated for each mode before imaging process based on the array parameters and the elevation of the targets. A proof-of-concept imaging system based on a circular phased array is created, and imaging experiments of corner-reflector targets are performed in an anechoic chamber. The azimuthal image is reconstructed by the use of Fourier transform and spectral estimation methods. The azimuth resolution of the two methods is analyzed and compared through experimental data. The experimental results verify the principle of azimuth resolution and the proposed phase compensation method.

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Orbital angular momentum in radio: Measurement methods

Cited by 121 publications

References 27 publications

Generation of Electromagnetic Waves with Arbitrary Orbital Angular Momentum Modes

Generation of Electromagnetic Waves with Arbitrary Orbital Angular Momentum Modes

A novel digital data transmission method using OAM modes

Electromagnetic Vortex-Based Radar Imaging Using a Single Receiving Antenna: Theory and Experimental Results

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