Implementation of a Graphene-Based RGW Coupler for THz Applications

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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“…And this is how it is described, 𝜏 −1 = 2Γ. Fermi-Dirac function is defined as follows [53][54][55][56][57]:…”

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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“…For example, graphene can transmit electrical current at very high speeds (in the form of photons), which makes it very useful for use in electronic and telecommunication chips [23][24][25][26][27][28]. Graphene conductivity is classi ed as follows [29][30][31][32][33]…”

Section: Conductivity Formulationsmentioning

confidence: 99%

Tunable circular polarization in reconfigurable graphene- based antenna decorated with gold motifs

Kiani,

Hamedani,

Rezaei

2023

Preprint

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The main goal of the designed research is to find a powerful tool for adjusting and tuning polarization in microstrip patch antennas. That surely this practical platform, it is the same as graphene. In fact, the right- and left-hand circular polarization and linear polarization can be achieved by turning on and off the chemical potential in the cuts created on the diagonal edges of the antenna. In the structure of the antenna, a triangular and square scheme of gold has been worked. One of the important features of the presented structure is frequency reconfigurable. According to the requirements of the design, the central frequency of the antenna is set at 0.67 THz. Silicon-Dioxide is considered as the substrate of the design. In the range of 0.65 THz through 0.7 THz, the matching and polarization are suitable. S11 is less than -14 dB for all types of polarization. Radiation efficiency is estimated about 50%. Eventually, the outputs of return loss, S11 sweep, axial ratio, radiation efficiency, 2D and 3D far-field radiation patterns, E-field distribution, and current density distribution have been reported.

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