A tunable metamaterial absorber using varactor diodes

Zhao, Jie; Cheng, Qiang; Chen, Jie; Qi, Mei; Jiang, Wei; Cui, Tie Jun

doi:10.1088/1367-2630/15/4/043049

Cited by 295 publications

(188 citation statements)

References 21 publications

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“…Researchers have proposed different methods to expand the operating bandwidths of MAs [65][66][67][68][69], while the flexible control of the MAs is still an intractable issue. Recent reports have shown that the absorbing frequencies of MAs can be dynamically adjusted by integrating tunable media (e.g., varactor diodes [70], liquid crystals [71], graphene [72], or phase-change materials [73]) to the traditional passive MAs. In some specific designs, researchers have advised to use oxide films [74] or film-cou pled colloidal nanoantennas [75] as superstrate/substrate to adjust the absorbing frequencies.…”

Section: Demonstrations For Ferrite-based Tunable Metamaterials Absorbersmentioning

confidence: 99%

Active and Tunable Metamaterials

Huang¹,

Li²

2017

Metamaterials - Devices and Applications

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In this chapter, we will first present the research progress on the active and tunable meta materials based on different realization methods, such as varactor diodes, liquid crystals, superconductivity, and structural-shifting structures. Then we focus on the achievements in our research group for the tunable metamaterials by using the ferrite as the substrate of metamaterials. We will present the designs and theories of single-, dual-, and tripleband tunable metamaterials based on the ferrite and the design of metamaterial absorb ers based on the ferrite. It will indicate that the proposed tunable metamaterials have many advantages compared with other active and tunable metamaterials.

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Section: Demonstrations For Ferrite-based Tunable Metamaterials Absorbersmentioning

confidence: 99%

Active and Tunable Metamaterials

Huang¹,

Li²

2017

Metamaterials - Devices and Applications

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“…하지만 동작 주파수를 높이기 위해선 표면에 매우 작은 커패시턴스 값이 요구되는데, 상용 버랙터의 커패시턴스는 매우 크기 때문에, 주파수 가변 가능 범위가 제한된다 [5] . 입력 임피던스(Z in )는 표면 임피던스(Z surf )와 기판 임피 던스(Zsub)의 병렬연결로 표현할 수 있다 [3] .…”

Section: Fss(frequency Selective Surface)와 His(high-impedanceunclassified

A Continuously Frequency Tunable Electromagnetic Wave Absorber Using Varactor Diodes and Multiple Slits

Cho¹,

Jo²,

Kim³

2016

The Journal of Korean Institute of Electromagnetic Engineering

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We propose a thin electromagnetic wave absorber using varactor diodes combined with intentionally introduced multiple slits, which enables continuous sweep of an absorption frequency band throughout relatively wide frequencies. The absorption frequency range of conventional electrically tunable absorbers has been restricted by high capacitance of varactor diodes. In order to overcome the problem, we introduce parasitic capacitance and connect them with varactors in series, which reduces the total capacitance dramatically. As a result, we can raise the operating absorption frequency up to the X-band region. Moreover, we can also control the operating frequencies by modifying the number of slits with little change in an entire frequency sweep range. Good agreement between simulated and measured results show the validity of our proposal.

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“…In this method, active devices such as varactor diodes, PIN diodes and micro-electro-mechanical systems (MEMS) have been used to achieve reconfigurability. A varactor diode is extensively studied in the literature [13][14][15]. It is modeled as a variable capacitance and this property brings various advantages such as simple integration and bias distribution due to using only one diode to achieve the tuning.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range

Esmail¹,

Majid²,

Abidin³

et al. 2017

IJECE

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In this paper, reconfigurable metamaterial structure at millimeter wave frequency range was designed and simulated for a future fifth generation (5G) mobile-phone beam switching applications. The new proposed structure was composed of a bridge-shaped resonator (BSR) in the front face and strip line at the back face of the unit cell which operates at 28GHz. First, nonreconfigurable low loss BSR unit cell was designed and subsequently, the reconfigurability was achieved using four switches formed in the gaps of the structure. The proposed structure achieves the lowest loss and almost full transmission among its counterparts by -0.06dB (0.99 in linear scale). To demonstrate the reconfigurability of the metamaterial, the reflection and transmission coefficients and real parts of the effective refractive index at each reconfigured frequency were studied and investigated. Simulation results showed that a high transmission and reflection peaks occur at each resonance frequency according to change the state of the switches. [6]. The study of the negative index metamaterials has been enhanced through various strategies and processes. However, few issues have been encountered such as the narrow bandwidths and losses that limit the spectrum and the range of their applications. Metamaterials suffer from high losses when the frequency is pushed to the higher range such as millimeter wave (MMW) bands [7]. However, the losses are very low and the unusual electromagnetic properties of the metamaterials can still be achieved within the microwave frequency region. The losses can give negative influences and adverse effects toward the realizations of the unique electromagnetic properties of the metamaterials. Throughout the years, the researchers had been proposed various technique to reduce such losses. Keyword: 5GA number of diverse techniques are extensively reported in the literature to compensate the metamaterials losses at microwave and terahertz such as tailoring geometry of metamaterial unit cell [8], using the electromagnetically induced transparency (EIT) at low frequency range [9], integrate an active

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A tunable metamaterial absorber using varactor diodes

Cited by 295 publications

References 21 publications

Active and Tunable Metamaterials

Active and Tunable Metamaterials

A Continuously Frequency Tunable Electromagnetic Wave Absorber Using Varactor Diodes and Multiple Slits

Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range

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