Mechanically actuated frequency reconfigurable metamaterial absorber

Kim, Jongyeong; Jeong, Heijun; Lim, Sungjoon

doi:10.1016/j.sna.2019.111619

Cited by 17 publications

(15 citation statements)

References 25 publications

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“…The MIMO arrangement of the proposed antenna had good diversity performance for a MIMO antenna. [49] Sensors 2021, 21…”

Section: Discussionmentioning

confidence: 99%

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Electromagnetic Control by Actuating Kirigami-Inspired Shape Memory Alloy: Thermally Reconfigurable Antenna application

Lee

Lim

2021

Sensors

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Electromagnetic responses are generally controlled electrically or optically. However, although electrical and optical control allows fast response, they suffer from switching or tuning range limitations. This paper controls electromagnetic response by mechanical transformation. We introduce a novel kirigami-inspired structure for mechanical transformation with less strength, integrating a shape memory alloy actuator into the kirigami-inspired for mechanical transformation and hence electromagnetic control. The proposed approach was implemented for a reconfigurable antenna designed based on structural and electromagnetic analyses. The mechanical transformation was analyzed with thermal stimulus to predict the antenna geometry and electromagnetic analysis with different geometries predicted antenna performance. We numerically and experimentally verified that resonance response was thermally controlled using the kirigami-inspired antenna integrated with a shape memory alloy actuator.

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“…The MIMO arrangement of the proposed antenna had good diversity performance for a MIMO antenna. [49] Sensors 2021, 21…”

Section: Discussionmentioning

confidence: 99%

“…Mechanical systems (using actuators, motors, etc. [ 18 , 19 , 20 , 21 , 22 , 23 , 24 ].) offer advantages from no operating frequency limitations to increased reliability in dust or moisture impacted environments compared with electrical and optical methods.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Control by Actuating Kirigami-Inspired Shape Memory Alloy: Thermally Reconfigurable Antenna application

Lee

Lim

2021

Sensors

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“…With this technique, resonant frequency can be shifted when thickness of the dielectric spacer varies. [ 40,96 ]…”

Section: Tuning Theory and Approaches In Masmentioning

confidence: 99%

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

et al. 2022

Advanced Materials

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Since the first demonstration, remarkable progress has been made in the theoretical analysis, structural design, numerical simulation, and potential applications of metamaterial absorbers (MAs). With the continuous advancement of novel materials and creative designs, the absorption of MAs is significantly improved over a wide frequency spectrum from microwaves to the optical regime. Further, the integration of active elements into the MA design allows the dynamical manipulation of electromagnetic waves, opening a new platform to push breakthroughs in metadevices. In the last several years, numerous efforts have been devoted to exploring innovative approaches for incorporating tunability to MAs, which is highly desirable because of the progressively increasing demand on designing versatile metadevices. Here, a comprehensive and systematical overview of active MAs with adaptive and on‐demand manner is presented, highlighting innovative materials and unique strategies to precisely control the electromagnetic response. In addition to the mainstream method by manipulating periodic patterns, two additional approaches, including tailoring dielectric spacer and transforming overall structure are called back. Following this, key parameters, such as operating frequency, relative tuning range, and switching speed are summarized and compared to guide for optimum design. Finally, potential opportunities in the development of active MAs are discussed.

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“…Among these, MEMS technology is a promising technique for actively tunable metamaterial due to its ability to directly modify the metamaterial unit cells. Moreover, MEMS tuning methods can provide an ideal platform for metamaterial, which is not limited by the nonlinear characteristic of natural materials and exhibits a large tuning range of resonant frequency [39,40].…”

Section: Introductionmentioning

confidence: 99%

Actively MEMS-Based Tunable Metamaterials for Advanced and Emerging Applications

Lin

2022

Electronics

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In recent years, tunable metamaterials have attracted intensive research interest due to their outstanding characteristics, which are dependent on the geometrical dimensions rather than the material composition of the nanostructure. Among tuning approaches, micro-electro-mechanical systems (MEMS) is a well-known technology that mechanically reconfigures the metamaterial unit cells. In this study, the development of MEMS-based metamaterial is reviewed and analyzed based on several types of actuators, including electrothermal, electrostatic, electromagnetic, and stretching actuation mechanisms. The moveable displacement and driving power are the key factors in evaluating the performance of actuators. Therefore, a comparison of actuating methods is offered as a basic guideline for selecting micro-actuators integrated with metamaterial. Additionally, by exploiting electro-mechanical inputs, MEMS-based metamaterials make possible the manipulation of incident electromagnetic waves, including amplitude, frequency, phase, and the polarization state, which enables many implementations of potential applications in optics. In particular, two typical applications of MEMS-based tunable metamaterials are reviewed, i.e., logic operation and sensing. These integrations of MEMS with metamaterial provide a novel route for the enhancement of conventional optical devices and exhibit great potentials in innovative applications, such as intelligent optical networks, invisibility cloaks, photonic signal processing, and so on.

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Mechanically actuated frequency reconfigurable metamaterial absorber

Cited by 17 publications

References 25 publications

Electromagnetic Control by Actuating Kirigami-Inspired Shape Memory Alloy: Thermally Reconfigurable Antenna application

Electromagnetic Control by Actuating Kirigami-Inspired Shape Memory Alloy: Thermally Reconfigurable Antenna application

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

Actively MEMS-Based Tunable Metamaterials for Advanced and Emerging Applications

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