Wideband-reconfigurable reflectarrays based on rotating loaded split rings

Martinez-Lopez, Lourdes; Rodriguez-Cuevas, Jorge; Martynyuk, Alexander E.; Martinez-Lopez, Jose I.

doi:10.1080/09205071.2014.993770

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…Mechanically reconfigurable metasurfaces refer to those using motors or other mechanical equipment to reconstruct the metasurface to change the electromagnetic responses of the unit cells. As shown in Figure 15 a [ 261 ], it is a reconfigurable metasurface loaded with micro-motors. The rotation of the motors allows the unit cells to have different orientations, resulting in different reflective phase responses due to PB phase theory.…”

Section: Mechanical Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

et al. 2023

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Metasurfaces have shown their great capability to manipulate electromagnetic waves. As a new concept, reconfigurable metasurfaces attract researchers’ attention. There are many kinds of reconfigurable components, devices and materials that can be loaded on metasurfaces. When cooperating with reconfigurable structures, dynamic control of the responses of metasurfaces are realized under external excitations, offering new opportunities to manipulate electromagnetic waves dynamically. This review introduces some common methods to design reconfigurable metasurfaces classified by the techniques they use, such as special materials, semiconductor components and mechanical devices. Specifically, this review provides a comparison among all the methods mentioned and discusses their pros and cons. Finally, based on the unsolved problems in the designs and applications, the challenges and possible developments in the future are discussed.

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Section: Mechanical Techniquesmentioning

confidence: 99%

“… ( a , b ) Two proposed works of metasurfaces loaded with micro-motors. Reprinted with permission from [ 261 ], copyright 2023 Taylor and Francis Publishing© 2023 IEEE. Reprinted, with permission, from [ 262 ]; ( c ) The schematic of the mechanically reconfigurable metasurface.…”

Section: Figurementioning

confidence: 99%

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

et al. 2023

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“…For example, scheduled recalibration of the stepping motors can improve the reliability caused by the accumulated error, and the implementation of algorithms of closed‐loop control can achieve a significant reduction of the motion delays. [ 33 ] In addition, the well‐developed MEMS techniques may be integrated with metasurfaces to realize tunable metasurface and actively manipulation of EM wave, which may promote the mass production.…”

Section: Experimental Verificationmentioning

confidence: 99%

“…[ 32 ] Besides, the use of micro‐electromechanical systems (MEMS) micromotors can be applied for millimeter‐wave applications. [ 33 ] With these merits, this technique of mechanically rotating the resonators to reconstruct the phase distributions can be used to achieve reconfigurable reflectarrays with beam scanning. [ 34 , 35 ] In this work, the structure orientation of each meta‐atom is individually controlled by a micromotor that is assembled behind the meta‐atom and electrically controlled by a field programmable gate array (FPGA) hardware system to realize dynamic reconfigurability, as shown in Figure 1d .…”

Section: Introductionmentioning

confidence: 99%

Angular‐Adaptive Reconfigurable Spin‐Locked Metasurface Retroreflector

et al. 2021

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Metasurface retroreflectors, which scatter the incident electromagnetic wave back to incoming direction, have received significant attention due to their compelling advantages of low profile and light weight compared with conventional bulky retroreflection devices. However, the current metasurface retroreflectors still have limitations in wide-angle and omnidirectional operations. This work proposes a high-efficiency, wide-angle, reconfigurable, and omnidirectional retroreflector composed of spin-locked phase gradient metasurface with a thickness of only 5.2 mm or 0.07 operating wavelength. The reflection phase of constituent meta-atoms can be controlled dynamically and continuously by altering their orientation states through individually addressing each mechanically rotational meta-atom, whereas the reflection handedness is kept the same as incidence. Therefore, adaptive and arbitrary momentum can be imparted to the incident wave, providing high-efficiency retroreflection over a wide continuous range from −47°to 47°. Moreover, such high-performance retroreflection is extended to omnidirectional level, enabling great degrees of freedom that are unavailable by previous researches. As a proof of concept, a retroreflective metasurface is fabricated and experimentally demonstrated at microwave frequencies. The proposed thin thickness, high efficiency, and reconfigurable metasurface retroreflector can be extended to other frequencies that may offer an untapped platform toward reconfigurable spin-based retroreflection devices for electromagnetic signal processing.

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“…Some common types of elements of CP used in the literature are split rings [9], rotated crossed dipoles [10], aperture coupled patches [11] and circular patches [12]. Mechanical angular rotation of the elements can also help to produce CP operation [13]. A polarization transform unit for CP operation with a linear feed can be comprised of a double layer T-shaped element [14] or a circular patch with two elliptical cross slots [15].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Patch Element Reflectarray with Dual Linear and Dual Circular Polarization

Dahri¹,

Jamaluddin²,

Inam³

et al. 2022

Computers, Materials &Amp; Continua

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A reflectarray antenna consisting of asymmetrical patch elements is proposed, which is capable of producing dual linear and dual circular polarized operation at 26 GHz frequency. The main purpose of this design is to support four different polarizations using the same patch element. The proposed reflectarray has a single layer configuration with a linearly polarized feed and circular ring slots in the ground plane. Asymmetric patch element is designed from a square patch element by tilting its one vertical side to some optimized inclination. A wide reflection phase range of 600°is obtained with the asymmetric patch element during unit cell measurements. A 332 element circular aperture reflectarray is designed with the proposed configuration and experimentally validated with a linearly polarized prime feed configuration. Two different orientations of mirror and non-mirror asymmetric patch elements on the surface of reflectarray are analyzed. Dual linear polarization is obtained with the mirror orientation of the asymmetric patch elements on the surface of reflectarray. Alternatively, asymmetric patch elements without mirror orientation are demonstrated to produce dual circular polarization with the same linearly polarized feed. A maximum measured gain of 24.4 dB and 26.1 dB is achieved for dual linear and dual circular polarization, respectively. Their respective measured efficiencies are 28% and 41.3%, which are supported by a maximum −3 dB gain bandwidth of 13.8% and 11.5%. The circular polarization operation of the reflectarray is also supported by a 6 dB axial ratio bandwidth of 9.2%. The proposed asymmetric patch reflectarray antenna with polarization diversity, wide bandwidth and high gain is suitable to be used in many high frequency applications of 5G communication.

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Wideband-reconfigurable reflectarrays based on rotating loaded split rings

Cited by 15 publications

References 18 publications

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Angular‐Adaptive Reconfigurable Spin‐Locked Metasurface Retroreflector

Asymmetric Patch Element Reflectarray with Dual Linear and Dual Circular Polarization

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