Phase-Gradient Meta-Dome for Increasing Grating-Lobe-Free Scan Range in Phased Arrays

Benini, A.; Martini, Enrica; Monni, S.; Viganó, Maria Carolina; Silvestri, F.; Gandini, Erio; Gerini, G.; Toso, Giovanni; Maci, S.

doi:10.1109/tap.2018.2835575

Cited by 54 publications

(33 citation statements)

References 24 publications

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“…To do so, the phased array elements have to be excited in a non-uniform fashion. The required excitation method is described in detail in [11]. This method phases the antenna elements in a way which creates a converging beam, which after passing through the angle-doubling lens becomes uniform in phase.…”

Section: Scan Enhancement Of Finitely Sized Arraysmentioning

confidence: 99%

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Theory and Simulation of Metasurface Lenses for Extending the Angular Scan Range of Phased Arrays

Egorov

Eleftheriades

2020

IEEE Trans. Antennas Propagat.

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Recent metasurface developments have led to their consideration for extending the angular scan range of phased arrays. This paper considers the use of Huygens' metasurfaces as lenses to accomplish the task. Ray optics is used to uncover how a single lens can extend the scan range. It is shown that a single scan extending lens leads to a broadside directivity degradation of the original beam. This directivity degradation is quantitatively characterized as a function of the desired angular scan-range expansion. A method of simulating phase boundaries is presented and used to verify the theoretical claims. A Huygens' metasurface lens design is presented and simulated to further validate the theoretical predictions and show that such lenses are physically realizable.

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Section: Scan Enhancement Of Finitely Sized Arraysmentioning

confidence: 99%

“…We have followed the common approach of studying scan enhancing metasurfaces, which is to treat them as phase-incurring boundaries. This was used in the context of wave optics as in [1], and in conjunction with physical optics (see [14], [15] for description of the method) to compute scattering as in [8], [11]. Sec.…”

Section: Introductionmentioning

confidence: 99%

Theory and Simulation of Metasurface Lenses for Extending the Angular Scan Range of Phased Arrays

Egorov

Eleftheriades

2020

IEEE Trans. Antennas Propagat.

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“…Perhaps the most promising scan enhancement approach up to date is discussed in [10]. There, a hypothetical phaseincurring lens-like surface was used to achieve scan enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…II-A. These definitions allow us to study the problem of near-field scan enhancement using a single metasurface lens analytically, instead of relying on numerical expressions as in [10]. In Sec.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Angular Scan Enhancement of Antenna Arrays Using Metasurfaces

Egorov¹,

Eleftheriades²

2020

Preprint

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In this publication we continue our previous work on extending the angular scan range of phased arrays using metasurfaces. We consider in detail scan enhancement using a single metasurface lens in the near-field of a source and provide analytical expressions for source excitation to obtain a desired beam. We show that such a device suffers from the same directivity degradation as in the case of far-field lens placement. Moreover, we discuss in detail that this approach has limitations, and one cannot place the lens arbitrarily close to the source array. We then propose a two-lens near-field scan enhancer which is not subject to the same limitations, although still subject to the same directivity degradation. Finally we propose a binary metasurface concept which theoretically achieves desired scan enhancement without directivity degradation. Some theoretical claims are then verified via full-field simulations.

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“…The divergent effect will reduce the directivity of the antenna and should be avoided as much as possible. This problem can be solved by elaborately controlling the amplitude and phase of each unit in PAA . Other possible ways may also be used to handle this problem: 1) use cascaded metasurfaces to give an optimization of the directivity of the output beam and 2) design wavevector‐based metasurface unit cells.…”

mentioning

confidence: 99%

Extending the Scanning Angle of a Phased‐Array Antenna Using a Thin Radome of Curved Metasurface

Liu

Dong

et al. 2020

Physica Rapid Research Ltrs

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A curved metasurface radome is designed to extend the scanning angle of a phased‐array antenna. Unlike the previous method, using negative index materials or transformation media (inhomogeneous and anisotropic), herein, only ordinary natural materials, i.e., a single‐layer well‐arranged ceramic block, are used, to realize the functions of the angle extending effect. The designed radome has a smaller size, lighter weight, a large angle extending effect, and is easy for fabrication. Therefore, the proposed method is more likely to be used in practical applications. The performance of the radome is verified by both numerical simulations and experimental demonstrations.

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Phase-Gradient Meta-Dome for Increasing Grating-Lobe-Free Scan Range in Phased Arrays

Cited by 54 publications

References 24 publications

Theory and Simulation of Metasurface Lenses for Extending the Angular Scan Range of Phased Arrays

Theory and Simulation of Metasurface Lenses for Extending the Angular Scan Range of Phased Arrays

Near-Field Angular Scan Enhancement of Antenna Arrays Using Metasurfaces

Extending the Scanning Angle of a Phased‐Array Antenna Using a Thin Radome of Curved Metasurface

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