Reconfigurable Vivaldi THz antenna based on graphene load as hyperbolic metamaterial for skin cancer spectroscopy

Poorgholam-Khanjari, Shima; Zarrabi, Ferdows B.

doi:10.1016/j.optcom.2020.126482

Cited by 64 publications

(25 citation statements)

References 50 publications

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“…In addition, the THz antenna technology has been developed for various goals such as cancer detection [17] and antenna with different forms have been developed of patch antenna with photonic crystal [18], dipole antenna [19], slot antenna [20], and Yagi antenna [21][22]. However, to detect material under test for the THz spectrum using metasurface [23] and absorbers [24] are more interesting than antenna.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Microfluidic as liquid lens for THz reconfigurable antenna and gain enhancement with sensing application

Ebrahimi

2021

Optik

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─ the lens plays important role in the dielectric resonator antenna (DRA) for increasing the bandwidth and directivity. Also, the liquids like water and ethanol can be noticed for developing the DRA for THz application. In addition, the liquids are interesting because the level and quality of material can be used for designing reconfigurable antenna. For the THz spectrum, the liquids can be combined with antenna and microwave devices by Microfluidic technology. In this paper, the suggested antenna is used to enhance the various factors of the antenna and the filling ratio of the channels is noticed to provide reconfigurable antenna. The slot antenna with split ring resonator and meandered feed is used as the basic antenna to provide high Q-factor. Moreover, the results show that this novel structure can be used as sensor for material detecting which is used to recognize various types of liquids by determining the sensitivity of the sensor in the range of 0.5 to 1 THz. The proposed sensor is examined for pure water, ethanol and gasoline based on the 2 nd order model of Debye.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Microfluidic as liquid lens for THz reconfigurable antenna and gain enhancement with sensing application

Ebrahimi

2021

Optik

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“…Since wide bandwidth, high gain and directivity for THz sensing is required in various applications, and maximum power handling is crucial in energy harvesting systems, an unbiased, reconfigurable antenna with adapting features is a proper solution for the maximization of the power handling, multiple resonance frequencies, high gain and low interference. S. Poorgholam-Khanjari et al [ 22 ] (p. 126482) demonstrate Vivaldi antenna for THz sensing application to obtain the reconfigurable characteristics. They propose the usage of graphene slabs to improve the antenna bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…Although various studies proposed antenna reconfiguration by adding a graphene layer, this method reduces the gain and bandwidth and adds to the manufacturing complexity and cost [ 22 ]. However, our proposed structure can achieve the reconfigurable characteristics with improved bandwidth, gain and radiation characteristics.…”

Section: Introductionmentioning

confidence: 99%

A Self-Adapting, Pixelized Planar Antenna Design for Infrared Frequencies

Shubbar

Rakos

2022

Sensors

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Infrared antennas with reconfigurable characteristics offer several advantages in the medical, military, telecommunication and energy harvesting areas, while their design and implementation is a particularly challenging task for the researchers. This paper proposes a pixel antenna, designed for mid-infrared frequencies with a bandwidth more than 25 THz, consisting of 3 × 3 square metallic planar patches. Bolometer-based switches are placed between the adjacent pixels in order to obtain the adaptable characteristics, optimized for the incoming infrared radiation. The incident wave from a certain direction will heat up the bolometers. Consequently, the conductivity of these bolometers (PTC) will be decreased, and as a result they can be considered to turn to OFF state. The simulation results suggest that the proposed structure can steer the antenna pattern toward the direction of the incident radiation in an adaptable manner, thereby considerably increasing the antenna gain. The gain of the antenna can be increased up to 2 dB with respect to the reference one, which makes it a promising structure for various applications.

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“…Early cancer detection plays an important role for the medical centers in the microwave [1], THz [2], and optical systems [3]. For this aim, various systems have been developed in the microwave spectrum for detecting breast cancer tumors during past decades [4] and microwave antenna is the main element for these systems [5].…”

Section: Introductionmentioning

confidence: 99%

THz absorber for breast cancer early detection based on graphene as multi-layer structure

Rezazadeh

Soheilifar²

2021

Opt Quant Electron

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─ Today, the cost of treating cancer is very high, so early detection of cancer is essential, and one of the possible ways to diagnose cancer in the early stages is to use sensors that are made in the terahertz area. The proposed structure is a multilayer structure in which graphene is used in the upper and middle layer and the middle layer has a ribbon form. A disk form element is used in the upper layer. Finally, a ring is added to the structure. In the final structure of the ring, it actually inhibits the field, and this will increase the Q-factor at 6.7 THz. The interaction of layers on each other and their effect on reflection is studied to modify the final structure by variation of the chemical potential of the graphene layer in the range of 0.2 to 0.6 eV. Finally, the proposed absorber is used to discriminate cancer and healthy breast tissue. The effect of the thickness and distance of the tissue from the absorber are examined to realize the material effect on sensitivity and figure of merit (FOM) as two main factors for detecting the cancer tissue.

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Reconfigurable Vivaldi THz antenna based on graphene load as hyperbolic metamaterial for skin cancer spectroscopy

Cited by 64 publications

References 50 publications

WITHDRAWN: Microfluidic as liquid lens for THz reconfigurable antenna and gain enhancement with sensing application

WITHDRAWN: Microfluidic as liquid lens for THz reconfigurable antenna and gain enhancement with sensing application

A Self-Adapting, Pixelized Planar Antenna Design for Infrared Frequencies

THz absorber for breast cancer early detection based on graphene as multi-layer structure

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