Frequency-tunable metamaterial absorber using a varactor-loaded fishnet-like resonator

Kim, Hyung Ki; Lee, Dongju; Lim, Sungjoon

doi:10.1364/ao.55.004113

Cited by 68 publications

(39 citation statements)

References 30 publications

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“…However, it is difficult to handle the multiple resonances simultaneously, and it is still insufficient to have a wide band characteristic. On the other hand, the most common method to change the frequency band is to use electronic devices such as PIN diodes, varactor diodes, and so on 13, 15, 16 . When using electronic devices, instantaneous frequency variation is possible.…”

Section: Introductionmentioning

confidence: 99%

Electronically Switchable Broadband Metamaterial Absorber

Lee

Jeong

Lim

2017

Sci Rep

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In this study, the novel electronically switchable broadband metamaterial absorber, using a PIN diode, is proposed. The unit cell of the absorber was designed with a Jerusalem-cross resonator and an additive ring structure, based on the FR-4 dielectric substrate. Chip resistors and PIN diodes were used to provide both a broadband characteristic and a switching capability. To satisfy the polarization insensitivity, the unit cell was designed as a symmetrical structure, including the DC bias network, electronic devices, and conductor patterns. The performance of the proposed absorber was verified using full-wave simulation and measurements. When the PIN diode was in the ON state, the proposed absorber had a 90% absorption bandwidth from 8.45–9.3 GHz. Moreover, when the PIN diode was in the OFF state, the 90% absorption bandwidth was 9.2–10.45 GHz. Therefore, the absorption band was successfully switched between the low-frequency band and the high-frequency band as the PIN diode was switched between the ON and OFF states. Furthermore, the unit cell of the proposed absorber was designed as a symmetrical structure, and its performance showed insensitivity with respect to the polarization angle.

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Section: Introductionmentioning

confidence: 99%

Electronically Switchable Broadband Metamaterial Absorber

Lee

Jeong

Lim

2017

Sci Rep

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“…[104,105] One of the most actively investigated functionalities is tunable perfect absorption; modifying the reverse biasing voltage of the varactors leads to a shift of the resonance frequency and, consequently, the spectral position of perfect absorption. [106,107] Usually, capacitances in the order of few pico-Farads (0.5-5 pF) are typically required for this purpose and can be obtained with commercially available diodes using moderate reverse bias voltages of the order of 0-15 V. In addition, offthe-shelf varactors come in packages of few cubic millimeters, making it possible to integrate them in GHz metasurafaces.…”

Section: Varactor Diodesmentioning

confidence: 99%

Toward Intelligent Metasurfaces: The Progress from Globally Tunable Metasurfaces to Software‐Defined Metasurfaces with an Embedded Network of Controllers

Tsilipakos

Tasolamprou

Pitilakis

et al. 2020

Advanced Optical Materials

176

108

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Metasurfaces, the ultrathin, 2D version of metamaterials, have recently attracted a surge of attention for their capability to manipulate electromagnetic waves. Recent advances in reconfigurable and programmable metasurfaces have greatly extended their scope and reach into practical applications. Such functional sheet materials can have enormous impact on imaging, communication, and sensing applications, serving as artificial skins that shape electromagnetic fields. Motivated by these opportunities, this progress report provides a review of the recent advances in tunable and reconfigurable metasurfaces, highlighting the current challenges and outlining directions for future research. To better trace the historical evolution of tunable metasurfaces, a classification into globally and locally tunable metasurfaces is first provided along with the different physical addressing mechanisms utilized. Subsequently, coding metasurfaces, a particular class of locally tunable metasurfaces in which each unit cell can acquire discrete response states, is surveyed, since it is naturally suited to programmatic control. Finally, a new research direction of software‐defined metasurfaces is described, which attempts to push metasurfaces toward unprecedented levels of functionality by harnessing the opportunities offered by their software interface as well as their inter‐ and intranetwork connectivity and establish them in real‐world applications.

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“…The former has been developed using resistive ink [ 20 , 21 ], multi resonance [ 22 , 23 , 24 , 25 ], or lumped elements [ 26 , 27 , 28 ] and the latter has been developed using electronic devices [ 29 , 30 , 31 , 32 ], fluidically tunable devices [ 33 , 34 , 35 , 36 , 37 ], or mechanically tunable devices [ 38 , 39 , 40 ]. Electronically reconfigurable metamaterial absorbers using P(Positive)-I(Intrinsic)-N(Negative) diodes [ 29 , 30 , 31 ] or varactor diodes [ 32 ] provide advantages of instantaneous response and compatibility with electronic circuits. However, the overall cost is high because the metamaterial is built as a periodic array and the number of electronic devices is extremely large.…”

Section: Introductionmentioning

confidence: 99%

Thermal Frequency Reconfigurable Electromagnetic Absorber Using Phase Change Material

Jeong

Park

Moon

et al. 2018

Sensors

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In this study, we propose a thermal frequency reconfigurable electromagnetic absorber using germanium telluride (GeTe) phase change material. Thermally-induced phase transition of GeTe from an amorphous high-resistive state to a crystalline low-resistive state by heating is used to change the resonant frequency of the absorber. For full-wave simulation, the electromagnetic properties of GeTe at 25 °C and 250 °C are characterized at 10 GHz under normal incidence for electromagnetic waves. The proposed absorber is designed based on the characterized electromagnetic parameters of GeTe. A circular unit cell is designed and GeTe is placed at a gap in the circle to maximize the switching range. The performance of the proposed electromagnetic absorber is numerically and experimentally demonstrated. Measurement results indicate that the absorption frequency changes from 10.23 GHz to 9.6 GHz when the GeTe film is altered from an amorphous state at room temperature to a crystalline state by heating the sample to 250 °C. The absorptivity in these states is determined to be 91% and 92%, respectively.

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Frequency-tunable metamaterial absorber using a varactor-loaded fishnet-like resonator

Cited by 68 publications

References 30 publications

Electronically Switchable Broadband Metamaterial Absorber

Electronically Switchable Broadband Metamaterial Absorber

Toward Intelligent Metasurfaces: The Progress from Globally Tunable Metasurfaces to Software‐Defined Metasurfaces with an Embedded Network of Controllers

Thermal Frequency Reconfigurable Electromagnetic Absorber Using Phase Change Material

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