Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications

Turpin, Jeremiah P.; Bossard, Jeremy A.; Morgan, Kenneth L.; Werner, Douglas H.; Werner, Pingjuan L.

doi:10.1155/2014/429837

Cited by 190 publications

(133 citation statements)

References 138 publications

(254 reference statements)

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“…This property is a remarkable attribute of metamaterials [34]. If the effective properties can be changed in real time, then the metamaterial is referred to as tunable [54].…”

Section: Tunable Metamaterialsmentioning

confidence: 99%

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Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Özis

Osipov

Eibert

2017

International Journal of Antennas and Propagation

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A radome is an integral part of almost every antenna system, protecting antennas and antenna electronics from hostile exterior conditions (humidity, heat, cold, etc.) and nearby personnel from rotating mechanical parts of antennas and streamlining antennas to reduce aerodynamic drag and to conceal antennas from public view. Metamaterials are artificial materials with a great potential for antenna design, and many studies explore applications of metamaterials to antennas but just a few to the design of radomes. This paper discusses the possibilities that metamaterials open up in the design of microwave radomes and introduces the concept of metaradomes. The use of metamaterials can improve or correct characteristics (gain, directivity, and bandwidth) of the enclosed antenna and add new features, like band-pass frequency behavior, polarization transformations, the ability to be switched on/off, and so forth. Examples of applications of metamaterials in the design of microwave radomes available in the literature as well as potential applications, advantages, drawbacks, and still open problems are described.

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“…This property is a remarkable attribute of metamaterials [34]. If the effective properties can be changed in real time, then the metamaterial is referred to as tunable [54].…”

Section: Tunable Metamaterialsmentioning

confidence: 99%

“…These changes can be achieved by adjusting the geometry of the unit-cell, for example, size, orientation, and position of resonators, or the material of the substrate. All these changes can be applied at the same time [54].…”

Section: Tunable Metamaterialsmentioning

confidence: 99%

Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Özis

Osipov

Eibert

2017

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

show abstract

“…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. However, low sensitivity to capacitance variation especially at high frequencies is the main drawback of this method besides the lack of suitable varactor diodes in terms of operating frequency and physical size [16]. The best switch in terms of high efficiency, low insertion loss and high isolation is MEMS, but this method has its own drawbacks such as high operation voltages (70-150V), complex fabrication requirements, expensive, and slow switching speed [16], [17].…”

Section: Introductionmentioning

confidence: 99%

“…However, low sensitivity to capacitance variation especially at high frequencies is the main drawback of this method besides the lack of suitable varactor diodes in terms of operating frequency and physical size [16]. The best switch in terms of high efficiency, low insertion loss and high isolation is MEMS, but this method has its own drawbacks such as high operation voltages (70-150V), complex fabrication requirements, expensive, and slow switching speed [16], [17]. On the other hand, the PIN diode is modeled as a variable resistance to represent the impedance of diode for varying bias voltage.…”

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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“…However, conventional FSSs present a limitation when applied to modern multifunctional and complex systems, as they constitute a passive circuit operating on a single frequency band. To address this problem, researchers have developed the active FSS (AFSS), which can operate on different frequency bands [4,5].…”

Section: Introductionmentioning

confidence: 99%

Design of Active Frequency Selective Surface with Curved Composite Structures and Tunable Frequency Response

Lee

Park

Chun

et al. 2017

International Journal of Antennas and Propagation

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We present an active frequency selective surface (AFSS) consisting of a curved composite structure that provides structural stability and robustness. The proposed structure can operate on either the C-band (OFF state) or X-band (ON state) by controlling the PIN diode located between the cross-shaped loop and the inductive stub on the surface. Moreover, it minimizes parasitic couplings through grid-type on/off bias circuits and via holes. Thus, the AFSS guarantees isolation from the unit cell, which is a downside of a previous control technique called reconfigurable frequency selective surface. We analyzed the impact of composite structures and the three-dimensional shape on the AFSS transmission with a foam-core sandwich structure, which is light and mechanically strong, by considering conditions of a real application environment.

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Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications

Cited by 190 publications

References 138 publications

Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range

Design of Active Frequency Selective Surface with Curved Composite Structures and Tunable Frequency Response

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