Design of novel beam-switching semicircular microstrip antenna and transmission line with Graphene at Terahertz frequencies
01 Dec 2016-pp 1-4
TL;DR: In this paper, a novel beam-switching printed semicircular antenna design has been proposed to operate at the Terahertz (THz) frequency band using Graphene to control the radiation characteristics.
Abstract: A novel beam-switching printed semicircular antenna design has been proposed to operate at the Terahertz (THz) frequency band The distinctive feature of the design lies in the use of Graphene to control the radiation characteristics of the antenna Further, we extend the same idea to explore the applicability of Graphene for isolation of electromagnetic energy with the help of a simple design of a microstrip transmission line with Graphene The proposed antenna and microstrip line designs have been carried out with an objective of realizing voltage controlled antennas and transmission lines which have lot of potential in various emerging and next generation wireless communication systems such as phased arrays, MIMO systems, sensor networks, etc
Citations
More filters
[...]
TL;DR: Graphene-based photoconductive antenna structures for optically excited terahertz (THz) emission was reported in this article. But, the performance of the proposed antenna was not analyzed.
Abstract: Graphene-based photoconductive antenna structures for optically excited terahertz (THz) emission is reported. Initially, a dipole antenna is designed using plasmonic graphene material on GaAs substrate, and its characteristics are found to be better than the previously reported structures. Further, the dipole antenna was improved to a Yagi-Uda-type photoconductive antenna, to obtain a focused radiation pattern. The proposed THz Yagi-Uda antenna is simulated and found to provide a gain of 8.64 dBi and a directivity of 9.57 dBi. Effect of the applied DC bias on the proposed graphene-based dipole and Yagi-Uda photoconductive antennas are also analyzed, and their emission intensities are obtained.
10 citations
Cites background from "Design of novel beam-switching semi..."
[...]
[...]
TL;DR: In this article, a numerical simulation platform with the full-wave finite-difference time-domain (FDTD) method in three-dimensional (3D) that couples multi-physics together is capable of getting the terahertz (THz) radiation spectrum.
Abstract: In order to display the terahertz (THz) radiation performance of the micro-structured photoconductive antenna (PCA) as true and accurate as possible, and the development of the numerical simulation platform for THz signals is reported in this paper. The numerical simulation platform with the full-wave finite-difference time-domain (FDTD) method in three-dimension (3D) that couples multi-physics together is capable of getting the THz radiation spectrum. And then the numerical simulation platform were well verified by the fact that the numerical simulation calculations provided very good agreement with the simulation and experimental results with Si-GaAs as the substrate material in the relevant reference. The results in this paper will be of significantly important to the design and analysis of the radiation performance of PCA with different micro-structures in the future.
2 citations
Cites background from "Design of novel beam-switching semi..."
[...]
[...]
TL;DR: A procedure for simulating the antenna on commercial EM solvers and several strategies to modulate the output of antennae, which is crucial for them to be suitable for wireless communications, are introduced.
Abstract: Interdigitated photomixing antennas (PMA), are amongst the most common sources for future terahertz wireless communication systems. In this contribution, a novel and interesting design of a PMA employing graphene as its electrode material has been proposed. The use of graphene provides several potential advantages over conventional metallic electrodes. Variation of the PMA output as a function of various parameters have been discussed and a novel scheme for producing modulation in the PMA output, using an additional signal source, has been introduced. The multiphysical scenario in the functioning of the PMA has been elegantly analyzed with a generalized and simple model. Expressions for the radiated fields from the antenna have been derived using the proposed model and have been validated with full-wave simulations. This paper introduces a procedure for simulating the antenna on commercial EM solvers. Several strategies to modulate the output of antennae, which is crucial for them to be suitable for wireless communications, have also been proposed and discussed with several key findings. The role of some of the antenna parameters have also been investigated. The uniqueness of this analysis lies in its simplicity and generalization along with its capability to combine the multi-physical scenario in the operation of the PMA.
2 citations
Patent•
[...]
24 Nov 2017
TL;DR: In this paper, an adjustable microstrip line signal transmission structure based on graphene is proposed, which consists of a dielectric plate, a microstrip lines and a graphene patch.
Abstract: The invention provides an adjustable microstrip line signal transmission structure based on graphene. The adjustable microstrip line signal transmission structure comprises a dielectric plate, a microstrip line and a graphene patch which are arranged on the upper surface of the dielectric plate, and a metal patch arranged on the lower surface of the dielectric plate, wherein the microstrip line and the graphene patch are arranged at the middle positions of the upper surface of the dielectric plate in parallel, and one long side of the microstrip line is connected with one long side of the graphene patch; and the lower surface of the dielectric plate is covered with the metal patch to form a metal ground. According to the adjustable microstrip line signal transmission structure based on graphene provided by the invention, impedance matching of the device or system can be realized, and dynamic adjustment for the impedance matching of the device or system is realized.
1 citations
Patent•
[...]
18 May 2018
TL;DR: In this paper, a graphene-based dual-frequency microstrip antenna was applied to a terahertz band, and a graphene patch array array was utilized as a director dipole, so that adual frequency bandwidth is generated under the condition of ensuring good radiation property of the antenna, and the radiation property was improved.
Abstract: The invention discloses a graphene-based dual-frequency microstrip antenna and belongs to the technical field of antennas and metamaterials The antenna sequentially comprises a polysilicon layer, a metal grounding plate and a silicon dioxide layer from bottom to top, wherein the upper surface of the silicon dioxide layer is provided with a feeder transmission line, a radiation patch and graphenepatches; each graphene patch is of an H-shaped structure formed by three rectangular patches; the graphene patches are connected with external DC bias voltage; and the other end of the external DC bias voltage is connected with the silicon dioxide layer The graphene-based dual-frequency antenna is applied to a terahertz band; and a graphene patch array is utilized as a director dipole, so that adual-frequency bandwidth is generated under the condition of ensuring good radiation property of the antenna, and the radiation property of the antenna is improved Compared with most dual-frequency antennas, the graphene-based dual-frequency microstrip antenna has the characteristics of being small in size, large in dual-frequency bandwidth, good in stability and simple in process
References
More filters
[...]
TL;DR: In this paper, an exact solution for the electromagnetic field due to an electric current in the presence of a surface conductivity model of graphene is obtained in terms of dyadic Green's functions represented as Sommerfeld integrals.
Abstract: An exact solution is obtained for the electromagnetic field due to an electric current in the presence of a surface conductivity model of graphene. The graphene is represented by an infinitesimally thin, local, and isotropic two-sided conductivity surface. The field is obtained in terms of dyadic Green’s functions represented as Sommerfeld integrals. The solution of plane wave reflection and transmission is presented, and surface wave propagation along graphene is studied via the poles of the Sommerfeld integrals. For isolated graphene characterized by complex surface conductivity σ=σ′+jσ″, a proper transverse-electric surface wave exists if and only if σ″>0 (associated with interband conductivity), and a proper transverse-magnetic surface wave exists for σ″<0 (associated with intraband conductivity). By tuning the chemical potential at infrared frequencies, the sign of σ″ can be varied, allowing for some control over surface wave properties.
1,987 citations
Proceedings Article•
[...]
TL;DR: In this article, a new quantum mechanical framework is used to analyze the properties of Carbon Nanotubes (CNTs) as nano-dipole antennas, and the results show that for a maximum antenna size in the order of several hundred nanometers (the expected maximum size for a nano-device), both a nano dipole and nano-patch antenna will be able to radiate electromagnetic waves in the terahertz band (0.1-10.0 THz).
Abstract: Nanotechnology is enabling the development of devices in a scale ranging from one to a few hundred nanometers. Coordination and information sharing among these nano-devices will lead towards the development of future nanonetworks, boosting the range of applications of nanotechnology in the biomedical, environmental and military fields. Despite the major progress in nano-device design and fabrication, it is still not clear how these atomically precise machines will communicate. Recently, the advancements in graphene-based electronics have opened the door to electromagnetic communications in the nano-scale. In this paper, a new quantum mechanical framework is used to analyze the properties of Carbon Nanotubes (CNTs) as nano-dipole antennas. For this, first the transmission line properties of CNTs are obtained using the tight-binding model as functions of the CNT length, diameter, and edge geometry. Then, relevant antenna parameters such as the fundamental resonant frequency and the input impedance are calculated and compared to those of a nano-patch antenna based on a Graphene Nanoribbon (GNR) with similar dimensions. The results show that for a maximum antenna size in the order of several hundred nanometers (the expected maximum size for a nano-device), both a nano-dipole and a nano-patch antenna will be able to radiate electromagnetic waves in the terahertz band (0.1–10.0 THz).
220 citations
"Design of novel beam-switching semi..." refers background in this paper
[...]
[...]
[...]
[...]
TL;DR: In this paper, the authors show that patterned metallic dipole antennas or arrays of dipole antenna deposited on graphene highly benefit from the reversible high resistivity-to-low-resistivity transition in graphene, tuned by a gate voltage.
Abstract: We have investigated several configurations of antennas based on graphene. We show that patterned metallic dipole antennas or arrays of dipole antennas deposited on graphene highly benefit from the reversible high-resistivity-to-low-resistivity transition in graphene, tuned by a gate voltage. The radiation pattern and the efficiency of such antennas are changed via the gate voltage applied on graphene.
164 citations
"Design of novel beam-switching semi..." refers background or methods in this paper
[...]
[...]
[...]
[...]
26 Mar 2012
TL;DR: In this article, the performance of a graphene-based nano-patch antenna in transmission and reception is numerically analyzed and the resonance frequency of the nano-antenna is calculated as a function of its length and width, both analytically and by simulation.
Abstract: Graphene-enabled wireless communications constitute a novel paradigm which has been proposed to implement wireless communications at the nanoscale. Indeed, graphene-based nano-antennas just a few micrometers in size have been predicted to radiate electromagnetic waves at the terahertz band. In this work, the performance of a graphene-based nano-patch antenna in transmission and reception is numerically analyzed. The resonance frequency of the nano-antenna is calculated as a function of its length and width, both analytically and by simulation. The influence of a dielectric substrate with a variable size, and the position of the patch with respect to the substrate is also evaluated. Finally, the radiation pattern of a graphene-based nano-patch antenna is compared to that of an equivalent metallic antenna. These results will prove useful for designers of future graphene-based nano-antennas, which will enable wireless communications at the nanoscale.
69 citations
"Design of novel beam-switching semi..." refers background in this paper
[...]
[...]
TL;DR: In this paper, a beam reconfigurable antenna operating at 500GHz is proposed based on single-layer graphene patches with tunable electrical conductivity, which can be dynamically controlled by the DC biasing voltage.
Abstract: This paper proposes the design of a novel beam reconfigurable antenna operating at 500GHz. Such antenna is based on single-layer-graphene patches with tunable electrical conductivity. Three groups of graphene patches play a key role for achieving directivity such as for the Yagi-Uda antenna. The conductivity of each graphene patch can be dynamically controlled by the DC biasing voltage. Numerical results show that the radiation beam of the antenna can vary in a range of ±50°, its input impedance bandwidth is about 8% with the peak gain of 7.5dB obtained.
8 citations
"Design of novel beam-switching semi..." refers background in this paper
[...]
[...]
[...]
Related Papers (5)
[...]
[...]