Designing of a circularly polarized reconfigurable graphene-based THz patch antenna with cross-shaped slot

Kiani, Narges; Hamedani, Farzad Tavakkol; Rezaei, Pejman

doi:10.1007/s11082-023-04617-y

Cited by 23 publications

(5 citation statements)

References 29 publications

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“…The comparison reveals that the proposed antenna achieves higher radiation efficiency in both linear and circular polarization operations than the reported antennas. Furthermore, unlike the proposed antenna, none of the antennas reported in [25][26][27][28][29][30][31][32][33][34][35] demonstrate similar LHCP and RHCP radiation patterns. An additional vital point is that the present work introduces the novel approach of utilizing magnetically biased graphene to achieve circular polarization.…”

Section: Resultsmentioning

confidence: 86%

“…c Table 1 presents a comparison between the proposed terahertz antenna, which offers polarization reconfiguration capability, and the antennas reported in previous studies [25][26][27][28][29][30][31][32][33][34][35]. The comparison reveals that the proposed antenna achieves higher radiation efficiency in both linear and circular polarization operations than the reported antennas.…”

Section: Resultsmentioning

confidence: 92%

“…Compared to this study, the present work demonstrates a significantly enhanced radiation efficiency of 76%, as opposed to the 30% achieved in the former. Furthermore, unlike the proposed antenna, none of the antennas reported in [25][26][27][28][29][30][31][32][33][34][35] demonstrate similar LHCP and RHCP radiation patterns. Additionally, it is worth noting that this study reports the novel application of a static magnetic field for polarization reconfiguration, marking a notable advancement in the field.…”

mentioning

confidence: 86%

“…Compared to this study, the present work exhibits higher radiation efficiency (76% compared to 16.2%). Furthermore, unlike the proposed antenna, none of the antennas reported in [25][26][27][28][29][30][31][32][33][34][35] demonstrate completely similar LHCP and RHCP radiation patterns.…”

mentioning

confidence: 86%

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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: 86%

Section: Resultsmentioning

confidence: 92%

mentioning

confidence: 86%

mentioning

confidence: 86%

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Graphene-based terahertz antenna with polarization reconfiguration

Fakhte,

Taskhiri

2023

Phys. Scr.

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“…In fact, complex conductivity is one of the most important factors in introducing graphene. This valuable parameter is derived from Kubo's famous formula [51][52]:…”

Section: Graphene Conductivitymentioning

confidence: 99%

Graphene-based quad-port MIMO reconfigurable antennas for SATCOM and 5G applications

Kiani

Hamedani

Rezaei

2023

Preprint

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In this research, two graphene-based THz patch antenna structures for satellite communication and 5G applications is reported. In the unit cell analysis, it can be pointed out that the patch is made of graphene and the substrate is made of silicon dioxide. While its dielectric permittivity is 3.7. The operating frequency of the MIMO antenna is designed at 0.6 THz. In the plan of MIMO reconfigurable antenna, cells are arranged vertically. Reconfigurable conditions can be achieved by changing the chemical potential or in other words the bias voltage of graphene patches. The amount of chemical potential in the original project of both quad-port MIMO reconfigurable antennas is considered to be 0.6 eV. In the results of the first antenna, S11 is less than -10 dB in the range of 0.58786 THz through 0.63112 THz. In the results of the second antenna, S11 is less than -10 dB in the range of 0.57814 THz through 0.63391 THz. In the results of the first antenna, maximum efficiency is reported about 65%. In the results of the second antenna, maximum efficiency is reported about 72%. Finally, peak realized gains, radiation efficiencies, far-field 2D radiation patterns, VSWRs, current distributions, envelope correlation coefficients (port1-port2, port1-port3, port1-port4), and diversity gains (port1-port2, port1-port3, port1-port4) have all been reported over the operating frequency band for two antennas.

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