A graphene antenna is a proposed highfrequency antenna based on graphene, a one atom thick two dimensional carbon crystal, that would enhance radio communications. Ultimately, the choice of graphene for the basis of this nano antenna was due to the behavior of. Given how thin a single sheet is, i would expect almost no alteration to the antennas characteristics. The extinction cross section of the nano antenna supported by silicon and silicon dioxide substrates of di erent thickness are calculated. A novel 2d leaky wave antenna based on complementary graphene patch cell to cite this article. Given how thin a single sheet is, i would expect almost no alteration to the antenna s characteristics. A kind of yagiuda antenna based on graphene with radiation pattern reconfigurable function has been proposed in this article.
The frequency response of the graphene based antenna at the transmitter is given by ai t f e tfd tf. Graphene patch antenna with lateral edges defined by armchair. Fundamental specifications of patch antennas radiation pattern a patch antenna radiates power in certain directions and we say that the antenna has directivity usually expressed in dbi. The effect of varying the graphene material chemical potential and relaxation time on the radiation characteristics of the graphene patch microstrip antenna has been investigated. Rajni bala, anupma marwaha and sanjay marwaha affiliation. The radiation characteristics including radiation efficiency and absorption cross section show significant improve on account of using pbg crystals substrate for graphene based patch antenna.
In a terahertz thz band, highgain antennas to be preferred to. S11 amplitude and phase and z11 real and imaginary parts of the graphene. A novel 2d leaky wave antenna based on complementary. The microstrip antennas radiation arises from the fringing fields, which are due to the advantageous voltage distribution. In this paper, we have investigated the graphene microstrip patch antenna that can operate at atmospheric windows. The graphene based adaptable reception apparatus utilized for a future thz application. We report the first experimental observation of thz radiation from graphene, as well as more than 3 orders of magnitude performance improvements in a halfedgecontacted gfet.
In consequence, graphenebased nanoantennas are envisaged to enable wireless communications among nanosystems 14. Based on the properties of graphene nano patch antennas, we propose a reconfigurable multipleinput multipleoutput mimo antenna system for terahertz thz communications. Aod, 2 where e t is the transmitting antenna radiation ef. The antenna contributes to the photocurrent in two ways. Graphene based yagi uda antenna with reconfigurable radiation patterns title. Printed graphene antennas and systems for rfid applications. Apr 06, 2016 a microchip that filters out unwanted radiation with the help of graphene has been developed by scientists from the epfl and tested by researchers of the university of geneva unige. The model of graphene patch antenna is created on fem based hfss software with physical dimensions of radiating patch having length l p 23m and width w p 31m.
Typical half wave patches have efficiencies well above 90%. The novel graphene antenna is designed to be resonated at 06 thz and shows several radiation properties. A microstrip patch antenna manufactured with flexible. Grapheneantenna sandwich photodetector nano letters. Characterization of graphenebased nanoantennas in the. The radiation pattern of an antenna is a plot of the farfield radiation properties of an antenna as a. Introduction electromagnetic waves are the most powerful tool to study the universe. The graphene patch antennas is widely used due to high electrical conductivity, high mobility, and saturation velocity in thz band. Grigory skoblin et al, graphene bolometer with thermoelectric readout and capacitive coupling to an antenna, applied physics letters 2018. Graphene patch antenna with lateral edges defined by. Table 1 gives the optimized dimensional parameters of the antenna. This paper presents a radiation pattern reconfigurable yagiuda antenna based on graphene operating at terahertz frequencies.
The extinction cross section of the nanoantenna supported by silicon and silicon dioxide substrates of dierent thickness are calculated. Graphene brings advantages, such as the miniaturisation of unit elements due to intrinsic plasmonic resonances, tunable e conductivity, and ohmic losses which are sufficiently low to guarantee smooth phase tunability efor thz frequencies 2. Development of graphene based tapered slot antennas for ultra. Here we present thz sources and detectors made with graphene field effect transistors gfets enhanced by a doublepatch antenna and an onchip silicon lens. All the antennas consist of a conducting patch and a feeding line and are printed on a duroid dielectric substrate with relative permittivity 2. Detection of ionizing radiation using graphene field effect transistors michael foxe, student member, ieee, gabriel lopez, student member, ieee, isaac childres, romaneh jalilian, caleb roecker, john. The microstrip antenna s radiation arises from the fringing fields, which are due to the advantageous voltage distribution. The coupling of the incident electromagnetic radiation with. In this work, we present a systematic numerical analysis of the terahertz radiation scattering on a graphenebased nanopatch antenna. C onclusion an initial investigation of a new patch antenna that uses exible graphene based conductive material was introduced in this paper. The extinction cross section of the nanoantenna supported by silicon and silicon dioxide. In this work, we study the radiation characteristics of a graphene patch antenna in the terahertz band.
With the purpose of studying the novel radiation properties of graphennas, in our previous work 6 we modeled a graphenna as a graphene patch over a dielectric substrate. The length of patch has been calculated using spp dispersion relation of graphene antenna resonance condition 11. In this paper, we exhibit a graphenebased microstrip patch antenna that operates at three atmospheric windows with minimum attenuation at 300 ghz, 350 ghz, 410 ghz bands. Graphenebased nanopatch antenna for terahertz radiation. Graphene as a fieldeffect transistor graphene is a monolayer or few atomic layers of graphite, which has unique electronic properties 1. For australian and new zealand students, tutorials located here. Paper open access mobile digital tv induction array four. Radiation is the term used to represent the emission or reception of wave front at the antenna, specifying its strength. First, the characteristics of the graphene are analyzed and a beam reconfigurable antenna is designed. Jun 22, 2018 simulate and analyze a rectangular patch antenna using ansys hfss, including return loss and 3d radiation fields. The effect of graphene chemical potential tunability on resonant frequency has been investigated and showed that for. S11 amplitude and phase and z11 real and imaginary parts of the graphene antenna for different voltage bias, with insulating and absorbent foam. The extinction cross section of the nano antenna supported by silicon and silicon dioxide substrates of dierent thickness are calculated. Graphene antennas for thz radiation a antenna layout b 3d gure of directivity figure 1.
The scattering of terahertz radiation on a graphene based nano patch antenna is numerically analyzed. Nanoscale antennas sandwiched between two graphene monolayers yield a photodetector that efficiently converts visible and nearinfrared photons into electrons with an 800% enhancement of the. Graphene based yagiuda antenna with reconfigurable. Return loss and efficiency of a graphene patch at low microwave frequencies. Thz and lowinfrared as mentioned in section i, around its plasma frequency graphene conductivity becomes mostly reactive and can.
Antenna performance is maximized by varying specific subcomponents. Nanoscale antennas sandwiched between two graphene monolayers yield a photodetector that efficiently converts visible and nearinfrared photons into electrons with an 800% enhancement of the photocurrent relative to the antennaless graphene device. In this work, we present a systematic numerical analysis of the terahertz radiation scattering on a graphenebased 1 nanopatch. In any illustration, the sketch drawn to represent the radiation of an antenna is its radiation pattern. Graphene is termed as the wonder material of the 21 st century with amazing optical and electrical properties and rapidly capturing interest in terahertz communication.
Comparison of the resonant frequency in graphene and. The antenna is located over an array of split ring resonators srr also made of graphene. One can simply understand the function and directivity of an antenna by having a look at its radiation pattern. Performance enhancement of patch antenna in terahertz. Graphene patch antennas with different substrate shapes. Graphene is highly conductive, thermally and electrically. In this paper, a reconfigurable thz patch antenna based on graphene is pr esented, whose resonance frequency can be changed depending on the applied voltage. The coupling of the incident electromagnetic radiation with the corresponding spp modes leads to resonances in the graphene based nano patch antenna. Figure 5 shows the 3d view of our proposed dualband recon.
Graphenebased patch antenna tunable in the three atmospheric. Abstract the scattering of terahertz radiation on a graphene based nano patch antenna is numerically analyzed. Graphene ink used for printing rf antenna suitable for rfid. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. In consequence, graphenebased nanoantennas are envisaged to enable wireless communications among. Analysis of graphene based triangular nano patch antenna. Enhanced radiation characteristics of graphenebased patch. The simulation has been performed using high frequency simulator software hfss, which is a commercially available electromagnetic simulator based on. The dynamic conductivity of the graphene, implanted in driven dipole antenna and parasitic elements, which can be tuned by changing the chemical potential, allows the proposed antennas to change the radiation beam into.
The basics of patch antennas, updated orban microwave. The patch antenna is therefore a voltage radiator, as opposed to the wire antennas, which radiate because the currents add up in phase and are therefore. There are several quantum effects that alter the propagation of em waves in graphene. The extinction cross section of the nano antenna supported by silicon and silicon dioxide substrates of different thickness are calculated. Citeseerx document details isaac councill, lee giles, pradeep teregowda. The scattering of terahertz radiation on a graphenebased nanopatch antenna is numerically analyzed.
Indeed, a graphenebased nanopatch antenna with lateral dimensions of just a few micrometers is predicted to resonate in the terahertz band, at a dramatically lower frequency and with a higher radiation efficiency with respect to their metallic counterparts. Three dimensional endtoend modeling and directivity. Development of graphene based tapered slot antennas for. Returns loss of the antenna versus graphene chemical potential. The extinction cross section of the nanoantenna supported by silicon and silicon dioxide substrates of different thickness are calculated. A microstrip patch antenna using graphene has been designed and simulated at 2. The antenna structure contains a radiating graphene patch and nonradiating graphene ring. Design of a reconfigurable mimo system for thz communications. Graphene brings advantages, such as the miniaturisation of unit elements due to intrinsic plasmonic resonances, tunable e conductivity, and ohmic losses which are sufficiently low to guarantee smooth.
The antenna worked well enough to make it practical for use in radiofrequency identification rfid tags and wireless sensors, according to the researchers. May 18, 2015 researchers at the university of manchester, along with uk graphene manufacturer bgt materials, printed a radio frequency antenna using compressed graphene ink. A microstrip patch antenna using graphene has been designed and simulated at. A microchip that filters out unwanted radiation with the help of graphene has been developed by scientists from the epfl and tested by researchers of the university of geneva unige. Graphene based yagi uda antenna with reconfigurable radiation patterns full record.
Performance enhancement of patch antenna in terahertz region using graphene volume. Highlights scattering of terahertz radiation on a graphene based nano patch antenna is numerically analyzed. The patch antenna is fed by a microstrip line feed l 2. Antenna enhanced graphene thz emitter and detector nano.
The prospect of tunable graphene based nano antenna for wireless communication is discussed. Antenna enhanced graphene thz emitter and detector nano letters. The operating frequency of antenna can be tuned by applying the gate voltage on the graphene patch. Detection of ionizing radiation using graphene field effect. Pdf graphene based antenna array for 5g applications. Simulate and analyze a rectangular patch antenna using ansys hfss, including return loss and 3d radiation fields. So graphene material is utilized, it has a superior execution in the parameters of return loss, voltage standing wave proportion vswr, gain and radiation effectiveness. Consequently, in order to dynamically control thz antenna radiation, a graphene reflectarray is proposed. With the ability to operate at terahertz region, graphenebased patch antennas will make terahertz communication feasible within few years. The extinction cross section of the nanoantenna supported by silicon and silicon dioxide substrates of. Graphene is both transparent and opaque to radiation. Fabryperot model of the plasmon polariton interaction with graphene based antenna is introduced. The first variation is the addition of graphene nanoribbons armchair and zigzag on the left and right edges of the graphene patch, in order to evaluate the influence of these structures on a patch antenna. Scattering resonances in the terahertz band are identi ed asabrypferot resonances.
819 458 287 695 689 515 336 805 1593 207 1061 1596 1566 406 765 458 204 759 712 1027 466 79 1228 800 469 586 795 1081 406 755 917 508 802 470 656 578 71 1309 804 776