Dual-band terahertz dielectric resonator antenna with graphene loading

Fakhte, Saeed; Taskhiri, Mohammad Mahdi

doi:10.1007/s11082-022-04229-y

Cited by 14 publications

(8 citation statements)

References 17 publications

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“…Within this theoretical approach, it is assumed that the interior region of the DRA can be regarded as a cavity. The four side walls of this cavity are treated as perfect magnetic conductors, while the bottom wall is considered to be a perfect electric conductor [18,43]. Furthermore, the top wall, where the graphene is positioned, is treated as an impedance surface.…”

Section: Resultsmentioning

confidence: 99%

“…The assumption is made that the upper wall of the DRA is fully covered by the graphene sheet. The electric and magnetic fields within the DRA, when loaded with unbiased graphene, have been previously determined as follows [18]: Where H 0 is the magnitude of the y component of the magnetic field, and k k k k , , ,…”

Section: Resultsmentioning

confidence: 99%

“…The proposed antenna is optimized to achieve the best impedance bandwidth, gain, and axial ratio in both linear and circular polarization, and the optimized values are as follows: The length and height of the silicon DRA are determined by assuming that it resonates in the TE x y 111 , modes. To do this, B 0 is considered to be 0, and the resonance frequency of this mode is calculated using the equations presented in reference [18].…”

Section: Gndmentioning

confidence: 99%

“…The use of graphene in THz antennas has the potential to revolutionize the field by enabling faster and more efficient communication and imaging at THz frequencies. A theoretical method for obtaining resonance frequencies of radiation modes of triangular DRA loaded with graphene was reported [18]. Circular polarization was achieved in [19] by incorporating a rectangular silicon slab on top of an annular DRA.…”

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confidence: 99%

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Graphene-based terahertz antenna with polarization reconfiguration

Fakhte,

Taskhiri

2023

Phys. Scr.

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This article presents the design of a terahertz antenna with the ability to reconfigure its polarization using graphene's anisotropic properties. By applying a DC magnetic flux, the graphene conductivity tensor can be transformed into a non-diagonal tensor. Conversely, the magnetic bias can be switched off to revert the tensor to a diagonal state. This approach allows the antenna to switch between linear and circular polarizations, making it highly versatile for terahertz applications. Additionally, by altering the direction of the applied DC magnetic bias, one can select the rotation direction of circular polarization between left and right hand. The feeding line and ground plane of the antenna are made of silver metal, and its behavior in the terahertz band is described using the Modified Relaxation-Effect model, which is more accurate than the skin effect model for this band. The finite element numerical method is utilized to analyze the antenna, which yields results consistent with the design predictions. The antenna’s impedance bandwidth spans 2.8 to 3.22 terahertz for linear polarization and 2.9 to 3.18 THz for circular polarization. The antenna’s maximum gain is 6 dB for linear polarization and 5 dB for circular polarization. The axial ratio for circular polarization is 1.36 in the middle of the band, which is below the 3dB threshold for circular polarization. The antenna produces directive patterns for both linear and circular polarizations. The key innovation of this antenna design lies in its unique utilization of a magnetostatic field to achieve reconfiguration in the terahertz graphene dielectric resonator antenna, a method that has not been previously documented in literature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Gndmentioning

confidence: 99%

mentioning

confidence: 99%

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Graphene-based terahertz antenna with polarization reconfiguration

Fakhte,

Taskhiri

2023

Phys. Scr.

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“…The use of multi-input-multi-output (MIMO) antennas to improve the isolation properties, mutual coupling increases and efficiency decreases. Paper [7] proposes, a microstrip fed elliptical-shaped super-wideband MIMO antenna with 2-elements for vehicular, Imaging, 3D printing, Terahertz, Health care, and Astronomical radiometric application. Graphene-based antenna arrays reduces mutual coupling due to inherent property of graphene as slow propagation speed of Surface plasmon polaritons wave.…”

Section: Introductionmentioning

confidence: 99%