Progress and perspective on advanced cloaking metasurfaces: from invisibility to intelligent antennas

Vellucci, S.; Monti, Alessio; Barbuto, Mirko; Toscano, Alessandro; Bilotti, Filiberto

doi:10.1051/epjam/2020013

Cited by 37 publications

(13 citation statements)

References 119 publications

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“…For example, the reduced interference and low visibility of a receiving antenna in sensing, imaging, monitoring, and communication applications are typically required to improve the overall performance of the system and make the system robust, which is achieved by cloaking the receiving antenna [1]- [5]. The elimination of the mutual coupling between tightly arranged antenna elements is also one of the main applications utilizing the cloaking technique [1], [6]- [9].…”

Section: Introductionmentioning

confidence: 99%

Metasurface Cloaks to Decouple Closely Spaced Printed Dipole Antenna Arrays Fed by a Microstrip-to-Balanced Transmission-Line Transition

Lee

Yakovlev

2021

IEEE Access

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In this work, we present a numerical study of 1D and 2D closely spaced antenna arrays of microstrip dipole antennas covered by a metasurface in order to properly cloak and decouple the antenna arrays operating at neighboring frequencies. We show that the two strongly coupled arrays fed by a microstrip-to-balanced transmission-line transition are effectively decoupled in 1D and 2D array scenarios by covering the dipole antenna elements with an elliptically shaped metasurface, which comprises subwavelength periodic metallic strips printed on an elliptically shaped dielectric cover around the dipole antennas and integrated with the substrate. We present a practical design of cloaked printed dipole arrays placed in close proximity of each other and demonstrate that the arrays are decoupled in the near field and operate independently in the far field with their original radiation characteristics as if they were isolated.INDEX TERMS Antenna arrays, beam steering, elliptical metasurface, mantle cloaks, microstrip-tobalanced transmission-line transition, mutual coupling, phased arrays.

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Section: Introductionmentioning

confidence: 99%

Metasurface Cloaks to Decouple Closely Spaced Printed Dipole Antenna Arrays Fed by a Microstrip-to-Balanced Transmission-Line Transition

Lee

Yakovlev

2021

IEEE Access

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“…As a first example of metasurfaces featuring advanced functionalities [20], we focus our attention on non-linear structures and, in particular, on the possibility to make the behaviour of a metasurface sensitive with respect to the level of the impinging power [21]- [26].…”

Section: A Modelling and Working Principlementioning

confidence: 99%

Intelligence Enabled by 2D Metastructures in Antennas and Wireless Propagation Systems

Barbuto

Hamzavi-Zarghani

Longhi

et al. 2022

IEEE Open J. Antennas Propag.

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The development of the next generation of wireless systems is bringing renewed attention to the physical layer of the communication link. Indeed, the new low-latency requirements cannot be satisfied relying only upon the extreme virtualization of the hardware functions. Moreover, conventional wireless systems with fixed characteristics and functionalities are not appropriate to modern electromagnetic environments, which undergo continuous and fast variations. Embedded smartness is a required feature for widening the range of the possible electromagnetic responses to support advanced and novel functionalities. In this paper, we show how the combination of 2D metastructures with conventional antennas and reflectors enables an unprecedented electromagnetic behaviour, which is at the basis of new properties, capabilities, and applications. In particular, we propose an emerging design approach based on the shifting of the reconfigurability, adaptivity, sensing, and power management of a wireless system at the physical level, thanks to the use of properly designed 2D metastructures to be coupled with standard antennas and reflectors.

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“…As a first step of the design process, the horizontal strips have been designed to return a large equivalent reactance (i.e., X s = -5000 Ω/sq). Towards this end, an analytical design procedure [23] and a full-wave numerical optimization through the commercial solver CST Microwave Studio® aiming at considering the nonidealities due to the curvature of the strips have been exploited. It is worth pointing out that different combinations of g and w can be used to achieve the desired surface reactance.…”

Section: Design Of Varactor-loaded Multi-layered Metasurfaces For Fre...mentioning

confidence: 99%

“…In fact, vertically polarized dipole/monopole antennas are widely employed in various mobile communications, broadcasting, networking, and sensing applications. To equip such antennas with unprecedented functionalities, one possibility is to surround them with properly designed metasurfaces [23]. For instance, the use of lightweight conformal metasurface coatings has been proposed and successfully demonstrated for the reduction of the blockage and mutual coupling effects arising between antennas placed in close proximity, allowing the design of extremely compact communication systems for both terrestrial [24]- [27] and satellite [28]- [30] applications.…”

Section: Introductionmentioning

confidence: 99%

Multi-Layered Coating Metasurfaces Enabling Frequency Reconfigurability in Wire Antenna

Vellucci

Sibi

Monti

et al. 2022

IEEE Open J. Antennas Propag.

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In this work, we introduce a conceptually new approach for designing frequency reconfigurable wire antennas based on the use of multi-layered wrapping metasurfaces. Specifically, we demonstrate that the complex-valued input impedance of a wire antenna can be tailored by engineering the electromagnetic characteristics of a coating metasurface and we discuss how this effect can be exploited for achieving wide-band frequency reconfigurability. We report the advantages and limitations of this approachespecially compared to conventional impedance matching techniques -and, as a relevant example, we discuss the design of a reconfigurable half-wavelength dipole. For this example, the coating metasurface consists of a three-layer capacitive structure loaded with varactor diodes. It is shown that the operative frequency band of the antenna can be dynamically and continuously shifted in a quite broad range of frequencies (2/3 octave bandwidth) while preserving the current distribution of the fundamental mode and the omnidirectional shape of its radiation pattern on the horizontal plane. The possibility to allocate the antenna service within continuous sub-bands of operation makes this solution particularly suited for cognitive radio systems.

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Progress and perspective on advanced cloaking metasurfaces: from invisibility to intelligent antennas

Cited by 37 publications

References 119 publications

Metasurface Cloaks to Decouple Closely Spaced Printed Dipole Antenna Arrays Fed by a Microstrip-to-Balanced Transmission-Line Transition

Metasurface Cloaks to Decouple Closely Spaced Printed Dipole Antenna Arrays Fed by a Microstrip-to-Balanced Transmission-Line Transition

Intelligence Enabled by 2D Metastructures in Antennas and Wireless Propagation Systems

Multi-Layered Coating Metasurfaces Enabling Frequency Reconfigurability in Wire Antenna

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