Miniature and Reconfigurable CPW Folded Slot Antennas Employing Liquid-Metal Capacitive Loading

Saghati, Alireza Pourghorban; Batra, Jaskirat Singh; Kameoka, Jun; Entesari, Kamran

doi:10.1109/tap.2015.2447002

Cited by 49 publications

(22 citation statements)

References 22 publications

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“…The spectral properties of an antenna are a function of its shape; thus the ability to both physically deform and manipulate the shape of liquid metal offers unique possibilities for tunable and reconfigurable antennas. Liquid metal injected into microchannels has been utilized to make many types of antennas including dipoles ( Figure a,b), loops (Figure c), coils and inductors (Figure d), patch antennas (Figure e), radio‐frequency antennas (Figure f), spherical caps, phase shifting coaxial transmission lines, monopoles, and reconfigurable antennas and filters . There are many more examples that utilize Hg.…”

Section: Stretchable Antennasmentioning

confidence: 99%

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Stretchable and Soft Electronics using Liquid Metals

2017

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can be patterned into non-spherical shapes using both conventional and unconventional methods to form highly conductive, durable, and stretchable wires, interconnects, and antennas. The deformation limits of conductors formed with liquid metal are only limited -in principle -by the mechanical properties of the encasing material. The geometrical changes to the metal during deformation can be harnessed to form softer-than-skin sensors of strain and touch. Liquid metals can also be utilized as active components in memory devices, diodes, electrodes, and capacitors built entirely from soft materials. In addition, liquid metals can form circuits that are self-healing and shape-reconfigurable.There are many exciting and promising applications that harness the unique properties of liquid metals. Recent advances, opportunities, and challenges with liquid metals based on gallium within the context of stretchable and soft electronics are discussed here.

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Section: Stretchable Antennasmentioning

confidence: 99%

“…Metals that are liquid can change shape and therefore function. The ability to move and manipulate the shape of liquid metals is useful for a number of applications including switches, reconfigurable antennas, and metamaterials and plasmonics . There are several methods to change the shape of the metal.…”

Section: Reconfigurablementioning

confidence: 99%

Stretchable and Soft Electronics using Liquid Metals

2017

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“…Recent development in the composite structure manufacturing creates the ability to embed microvascular networks in flexible materials and enables conductive or dielectric fluid to be injected into these materials. To reconfigure the antenna's frequency, the conductive fluid is used as a switch [27], the reactive loading effects of the fluid metal are used in [64,65], antenna fabricated by injecting alloys is elongated via stretching [66,67], the permittivity range of substrate is changed [28,29].…”

Section: Microfluidic Antennasmentioning

confidence: 99%

“…In other research, the reactive loading effect of the fluid metal is used for tuning of a coplanar waveguide (CPW) folded slot antenna and miniaturization as well [64,65]. Two pairs of microfluidic channels are used as a switch to reconfigure between 2.4 GHz, 3.5 GHz, and 5.8 GHz [64]. The antenna is placed on Taconic TLY substrate with ε r = 2.2, tan δ = 0.0009, with a thickness of 1.53 mm and two separate PDMS structures are used for two channels.…”

Section: Microfluidic Antennasmentioning

confidence: 99%

Recent Developments and State of the Art in Flexible and Conformal Reconfigurable Antennas

et al. 2020

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Reconfigurable antennas have gained tremendous interest owing to their multifunctional capabilities while adhering to minimalistic space requirements in ever-shrinking electronics platforms and devices. A stark increase in demand for flexible and conformal antennas in modern and emerging unobtrusive and space-limited electronic systems has led to the development of the flexible and conformal reconfigurable antennas era. Flexible and conformal antennas rely on non-conventional materials and realization approaches, and thus, despite the mature knowledge available for rigid reconfigurable antennas, conventional reconfigurable techniques are not translated to a flexible domain in a straight forward manner. There are notable challenges associated with integration of reconfiguration elements such as switches, mechanical stability of the overall reconfigurable antenna, and the electronic robustness of the resulting devices when exposed to folding of sustained bending operations. This paper reviews various approaches demonstrated thus far, to realize flexible reconfigurable antennas, categorizing them on the basis of reconfiguration attributes, i.e., frequency, pattern, polarization, or a combination of these characteristics. The challenges associated with development and characterization of flexible and conformal reconfigurable antennas, the strengths and limitations of available methods are reviewed considering the progress in recent years, and open challenges for the future research are identified.

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“…They are having good compatibility in several applications such as health monitoring, military, patient tracking, and smart house. Conventional antennas have solid substrates such as FR4, Rogers 3006, and 5880, whereas these flexible antennas have substrates made of polymer, textile, carbonnano tube, and microfluidic based . Each of these flexible substrates has their own advantages.…”

Section: Introductionmentioning

confidence: 99%

Specific absorption rate reduction using metasurface unit cell for flexible polydimethylsiloxane antenna for 2.4 GHz wearable applications

Janapala

Nesasudha

Neebha

et al. 2019

Int J RF Microw Comput Aided Eng

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This article presents the design of a polydimethylsiloxane based flexible antenna for body worn applications. In order to reduce the specific absorption rate (SAR) metasurface (MS) based unit cell is proposed. Copper foil of thickness 3 mil considered for conducting layers. The proposed antenna is designed with leaf structure and covers the WLAN ISM band 2.4 GHz without metasurface (NMS) and with metasurface (WMS) unit cell. The MS unit cell at the backside of the antenna does not cover the entire antenna but only a portion of it where the backward energy is highly concentrated. This yields better result in reducing the SAR with a very compact sized MS unit cell. This MS structure improves the gain of an antenna and also reduces the SAR, by directing the radiating energy in opposite direction from the human user. The proposed antenna NMS has a simulated SAR value of 2.53 W/kg at 2.4 GHz over volume of 1 g of tissue, whereas WMS it is reduced to 1.53 W/kg. The comparative analysis of the proposed antenna presented with the help of performance matrices like reflection coefficient, SAR, gain, and radiation patterns.

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Miniature and Reconfigurable CPW Folded Slot Antennas Employing Liquid-Metal Capacitive Loading

Cited by 49 publications

References 22 publications

Stretchable and Soft Electronics using Liquid Metals

Stretchable and Soft Electronics using Liquid Metals

Recent Developments and State of the Art in Flexible and Conformal Reconfigurable Antennas

Specific absorption rate reduction using metasurface unit cell for flexible polydimethylsiloxane antenna for 2.4 GHz wearable applications

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