Beam steering for OAM beams using time‐modulated circular arrays

Song, Qilong; Wang, Y.; Li, Kai; Zhang, Jie

doi:10.1049/el.2018.5386

Cited by 16 publications

(12 citation statements)

References 6 publications

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“…In [14], the deflected vortex beams was simulated with sidelobe of nearly −5 dB when the deflection angle of the OAM vortex beam is 20 • . And in [18], the deflected vortex beam with sidelobe level approximately higher than −5 dB was reported. It seems that heretofore there are a few attentions to this problem of deflected vortex beam sidelobe level suppression.…”

Section: Introductionmentioning

confidence: 95%

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Synthesis and Measurement of a Circular-Polarized Deflection OAM Vortex Beam With Sidelobe Suppression Array

et al. 2020

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In this paper, a chamfer distribution antenna array is designed to generate a deflecting circular-polarized vortex beam carrying orbital angular momentum (OAM) mode. When the vortex beam is designed with a deflection angle, the sidelobe of the vortex beam will deteriorate. In order to solve this problem, an optimized array design is presented in this paper. Inspired by the Chebyshev distribution array synthesis method, the antenna elements in the four corners of the antenna array are cut out to realize the chamfer distribution array. Therefore, the sidelobe level of the deflected vortex beam can be effectively suppressed. Moreover, a simplified feeding network is designed to reduce the feeding network complexity by using circularly polarized structural center antenna element. The designed antenna array is simulated, fabricated, and measured at center frequency of 4.25 GHz in C-band. The far-field radiation pattern of the deflected vortex beam and the near E-field OAM vortex beam distribution are simulated and measured to verify the effectiveness of the proposed design method for sidelobe suppression array. INDEX TERMS Chebyshev array synthesis, chamfer antenna array, orbital angular momentum (OAM), sidelobe suppression, circular-polarized vortex beam.

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Section: Introductionmentioning

confidence: 95%

“…Although some optimization array design methods were presented for UCA antenna, however, they were mainly used for the vortex beam without the beam deflection [13]. When the OAM vortex beam is deflected, its sidelobe level will evidently increase [12], [14], [18]. In [12], the deflected vortex beam was considered.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Measurement of a Circular-Polarized Deflection OAM Vortex Beam With Sidelobe Suppression Array

et al. 2020

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“…1, all h pkmax !À∞, which is the predicted result as can be seen in Eqs. (5) to (10), with k=1, 2, and 3. Again there is no radiation at h p2 for τ p = 0.5 and at h p3 for τ p = 0.3 and 0.66 which can also be verified from Eq.…”

Section: Characteristics Of Harmonic Radiations (Hrs)mentioning

confidence: 99%

“…In such cases, sideband signals and associated power losses are suppressed to improve the radiation efficiency at the operating frequency of the antenna array [5,6]. Presently, it is investigated that sideband signals are also effective in synthesizing multiple patterns and researchers are interested to exploit the same in some specific applications of the modern-day communication systems like harmonic beam forming [7], generation of multibeam radiation pattern [8], beam steering [9,10], direction finding [11], wireless power transmission [12], etc. The interested readers may refer to Reference [13] for the stateof-the-art overview, applications, and present research trend on time-modulation theory and techniques.…”

Section: Introductionmentioning

confidence: 99%

Pattern Synthesis in Time-Modulated Arrays Using Heuristic Approach

Mandal¹,

Mukherjee²,

Mandal³

et al. 2020

Advances in Array Optimization

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Time-modulation principle evolves as an emerging technology for easy realization of the desired array patterns with the help of an additional degree of freedom, namely, "time." To the antenna community, the topic, time-modulated antenna array (TMAA) or 4D antenna arrays, has got much attention during the last two decades. However, population-based, stochastic, heuristic evolutionary algorithm plays as an important protagonist to meet the essential requirements on synthesizing the desired array patterns. This chapter is basically devoted to understand the theory of different time-modulation principles and the application of optimization techniques in solving different antenna array synthesis problems. As a first step, the theory of time-modulation principles and the behaviors of the sideband radiation (SBR) that appeared due to time modulation have been studied. Then, different important aspects associated with TMAA synthesis problems have been discussed. These include conflicting parameters, the need of evolutionary algorithms, multiple objectives and their optimization, cost function formation, and selection of weighting factors. After that, a novel approach to design a time modulator for synthesizing TMAAs is presented. Finally, discussing the working principle of an efficient heuristic approach, namely, artificial bee colony (ABC) algorithm, the effectiveness of the time modulator and potentiality of the algorithm are presented through representative numerical examples.

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“…Generation of OAM mode l = 3 has been demonstrated at 18 GHz using a Cassegrain antenna fed by a 4 × 4 waveguide Butler matrix [14]. Instead of expensive phase shifters, a time-modulated circular array, where individual antenna elements were sequentially switched on/off has also been used to realize OAM beams [15]. Such an implementation allows the generation of multiple OAM-carrying beams at several harmonic frequencies simultaneously, as well as enhancing the field intensity of each mode [16].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Laguerre–Gaussian mode purity produced by three-dimensional-printed microwave spiral phase plates

Isakov

Allen

et al. 2020

R. Soc. open sci.

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Computer-aided design software and additive manufacturing provide flexibility for the direct fabrication of multi-material devices. This design and fabrication versatility has been investigated for the manufacture of dielectric spiral phase plates (SPP) that generate electromagnetic waves with helical wavefronts. Three types of SPPs designed to produce an orbital angular momentum (OAM) mode number l = |1| were additively manufactured using material extrusion and polyjet fabrication methods. The OAM mode characteristics of the transformed helical microwaves as a function of the SPP geometrical features were investigated experimentally in the 12–18 GHz frequency range. The SPPs were further combined with an additively manufactured dielectric lens that provided a marked improvement in OAM mode purity. Finally, multiplexing and de-multiplexing of two OAM modes were demonstrated successfully using an optimum SPP geometry and arrangement.

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Beam steering for OAM beams using time‐modulated circular arrays

Cited by 16 publications

References 6 publications

Synthesis and Measurement of a Circular-Polarized Deflection OAM Vortex Beam With Sidelobe Suppression Array

Synthesis and Measurement of a Circular-Polarized Deflection OAM Vortex Beam With Sidelobe Suppression Array

Pattern Synthesis in Time-Modulated Arrays Using Heuristic Approach

Evaluation of the Laguerre–Gaussian mode purity produced by three-dimensional-printed microwave spiral phase plates

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