A unit cell of srr has also been designed for the frequency of 10. The resonance frequency for the intended antenna design is 2. Metamaterial unit cell square srr design using cst and. Kumar vaibhav srivastava department of electrical engineering indian institute of technology, kanpur, india. The hfss scripts can either be directly run from within the hfss gui environment taking inputs from a preprepared. Gain improvement of microstrip patch antenna using negative.
Lumped elementbased, highly subwavelength, negative index. To obtain refraction index of metamaterial superstrate, a unit cell is identified from the full size structure and placed in. The use of lumped elements enabled the creation of highly subwavelength unit cells whose. The results are measured over the frequency range of 8 ghz to 20ghz by em solver ansoft hfss. A comparative analysis of different conventional and metamaterial based microstrip patch antenna. First we must configure hfss to use its eigenmode solver. This includes remotely controlling how an incident electromagnetic wave em wave interacts with a metamaterial.
Aug 18, 2016 this tutorial covers how to use master slave boundary conditions of hfss to simulate fss in terahertz region. A tunable metamaterial is a metamaterial with a variable response to an incident electromagnetic wave. The simulated ge 2 sb 2 te 5 layer can be achieved as following. A compact metamaterial inspired antenna operate at lte, bluetooth and wimax frequency band is introduced in this paper. In order to form the metamaterial unit cells a metal. How can i simulate metamaterials based antenna in hfss. Subwavelength metamaterial unit cell for lowfrequency. Design of metamaterials in hfss and extraction of permittivity and permeability using nrw method. Theoretical and experimental studies have shown that such structures can be taken as a homogenous medium with a low plasma frequency 4. A threedimensional actuated origamiinspired transformable. This proposed uwb antenna is made of four metamaterial unit cells, where each cell is an integration of a modified split ring. It also covers how to change the angle of incidence with the help of floquet ports. Pull the mesh from the unit cell set hfss so it doesnt perform any additional meshing. Utilizes replicated ddm unit cell to address array concerns geometry and mesh copied directly from unit cell model unit cell geometry expanded to finite array through a simple gui adaptive meshing process imported from unit cell simulation dramatically reduces the meshing time associated with finite array analyses.
Using amperes circuital law, we can relate flux on disk faces and the resonant behaviour of edr unit cell. The unit cell is designed with its resonance within the uwb range of 3. Metamaterial fss unit cell design using hfss part 1 youtube. Microwave electronics lab hfss characterization of 2d crlh tl 0 2 4 6 8 10 12. A unit cell is a combination of srr and wire structure which is shown in figure. Tutorial on modeling of metamaterial structure in ansys hfss free download as pdf file. Synthesis and analysis of metamaterial structure for microwave frequency applications iii resonator dssrr and microwave absorber. Mechanical metamaterials exhibit unusual properties through the shape and movement of their engineered subunits. Retrieval center for metamaterials and integrated plasmonics. How to design metamaterial unit cell square srr design. Gain improvement of microstrip patch antenna using. Feb 22, 2018 how to design metamaterial unit cell square srr design using cst and hfss duration.
By using metamaterial reflecting surface technique we obtain 4. Hey everybody, im simulating a dng metamaterial in hfss 12. Assign the front and back faces of the box as waveport excitations with vertic. Mar 11, 2016 a threedimensional actuated origamiinspired transformable metamaterial with multiple degrees of freedom. Create a box around your single metamaterial element, such as an split ring resonator srr. It will consist of background presentations and discussion, applications and analysis examples with hfss and presentations from academia and industry.
Next, the unit cell of the sievenpiper mushroom structure has to be drawn in hfss. It consists of a square patch, a via, and a square block of substrate as shown in fig. It is a soft option to design and fabricate it by recurring structure of unit cells. They have taken airdielectricair as an example, which is a 3d structure. Example unit cell analysis infinite array analysis of an open ended waveguide with plug array this example is intended to show you how to setup and postprocess an a phased array using unit cell analysis using hfss. A miniaturized antenna with negative index metamaterial based. The metal layer in the proposed unit cell follows drude model with the plasma frequency. A study of srr based microstrip antenna and their equivalent circuits have been carried out. Phase characteristics of subwavelength antenna elements. Apart from the geometry of the unit cell element, material properties, conductor and substrate thickness the most influential. Hfss masterslave simulation setup of a reflectarray consisting of an aluminum backed mylar substrate of height h, square unit cell periodicity p, and aluminum patch side length l.
The unit cell is cubic, with a cell dimension of d2. Improvement of characteristics of microstrip antenna using. Microwave electronics lab analysis and design of lefthanded metamaterial lenses using ansoft hfss anthony lai1, kevin m. The transient solver could also be used to model unit cells at normal incidence. Single pixel characterization spectrally selective and polarization sensitive.
Please help me in the modeling of srr structure in hfss. Another demonstration of negative permittivity of mtms was done by a structural unit cell of proposed electric disk resonator which consisted of two disks connected by a central post as in figure 2b. I would like to simulate metamaterial unit cell, i have problem about floquet port and masterslave boundary assignment in hfss. Hfss simulation of the proposed antenna shows improved gain and return loss. The analysis of the required onedimensional lefthanded metamaterial unitcell based on microstrip technology is presented in detail. We note that the smaller the unit cell size is, the better the effective medium results should be, i. Design of millimeter wave microstrip patch antenna for mimo. The structures of unit cells were simulated using high frequency structure simulator hfss software. Ansys hfss with hpc for large finite antenna array design. Above the resonant frequency of unit cell, effective permittivity is negative, where the electric resonance frequency is independent on the leakage capacitance between plates and post. Tutorial on modeling of metamaterial structure in ansys hfss scribd. Next, the designed unit cell is cascaded to form a leakywave antenna.
Tunability of triangular srr and wire strip tsrrws. Cst microwave studio 1 one of the most important reports in metamaterial topics is dispersion curve, which determines the. The design of the mtm antenna thus begins with the use of one unit cell as the radiating element, as shown in figure 5a. A rule of thumb is that the unit cell should be at most a tenth of the wavelength. Metamaterial unit cell models the transmission line structures consist of series. In this paper, we propose a subwavelength metamaterial unit cell for lowfrequency electromagnetic absorber applications. Each cell has a spacing of 1 mm in x andydirection to the adjacent ones as shown in figure 1.
Lumped elementbased, highly subwavelength, negative. The retrieval method is a practical approach to determine the effective properties of metamaterials. Improvement of characteristics of microstrip antenna using of. Speeding up the hfss 3d simulation design cyle using customisable scripting. S k behera department of electronics and communication engineering.
Lh at low frequencies rh at high frequencies c l l r c r l l c l l r c r l l patch ground plane via 2d unit cell p period of unit cell p 4. Pdf a proposed design of unit cell of metamaterial for 5g mobile. Design, fabrication, and testing of double negative metamaterials. The dielectric substrate is fr4 structure can be controlled by tuning the spiral and substrate dimensions. The key element behind our metamaterial mechanisms is a specialized type of cell, the only ability of which is to shear. In this method, we first measure or simulate the reflection and transmission of a slab of metamaterial.
Hfss simulation of the proposed antenna shows improved gain and return loss at the centre frequency of 4. For each unit cell type, the dimensions of unit cell can be adjusted to satisfy condition at resonant frequency fr. Unlike the rigid cell, this shear cell is designed to deform when a force is applied, more specifically to shear, which allows for controlled directional movement. The unit cell for the coupled s shaped structure medium is shown in fig. Speeding up the hfss 3d simulation design cyle using. To give an example of metamaterial antennas, a team at china jiliang university. In this paper, an investigation of metamaterial unit cells is presented based on their dispersion characteristics. Microstrip patch antenna, srr, metamaterials, hfss i. How to design metamaterial unit cell square srr design using cst and hfss full tutorial.
Metamaterials in application to improve antenna parameters. The equivalent circuit model of the crlh unit cell of the metamaterial transmission line. Metamaterial unit cell square srr design using cst and hfss part 1. Metamaterial seminar sponsored by ansys the ansys metamaterials simulation conference will focus on electromagnetic simulation of metamaterial and metamaterial related structures. A unit cell is usually smaller than 110 of the operating wavelength see figure 7, depending on the shape of the metamaterial, but the unit cell size is different 19, 20, 26. Thus, at this frequency, the unit cell size is d cell, both to be discussed in sec. Hfss with hpc for large finite antenna array design 8232011. The floquet port is placed at the top of an air box light blue, a master boundary green is shown on the xaxis, and a slave boundary pink is shown at. Phase characteristics of subwavelength antenna elements for. This means the capability to determine whether the em wave is transmitted, reflected, or absorbed.
A miniaturized antenna with negative index metamaterial. Hfss tutorial 1 microstrip patch antenna with coaxial feeding duration. Dual band metamaterial antenna for ltebluetoothwimax. The unit cell can be an ecient source of radiation when excited by its eigencurrents 27. How to simulate metamaterial antenna using hfss quora. Scripts have been generated for ansys hfss and also awr microwave officemwo. Nixonb asubmillimeterwave technology laboratory, university of massachusetts lowell, lowell, ma, usa 01854. It was observed that electric field reverses direction just above or just below the resonant frequency of unit cell, thus depicting negative.
Next, the unitcell of the sievenpiper mushroom structure has to be drawn in hfss. Proper description of assigning the boundaries and feeding mechanism was also mentioned. Efforts to compensate and eliminate optical loss by introducing optical gain into the metamaterial matrix. Strucure of unit cell metamaterial are usually implemented in a periodic structure. Tutorial on saptarshi ghosh, iit kanpur, india modeling of metamaterial absorber structure in ansys hfss saptarshi ghosh thesis supervisor. Metamaterialinspired frequencyselective surfaces eecs. To study the electromagnetic resonant property of the proposed structure, simulations are performed by ansofts hfss. The analysis of the required onedimensional lefthanded metamaterial unit cell based on microstrip technology is presented in detail.
Enhancement of the absorption and bandwidth of a hybrid. Design of metamaterial based antenna using unit cells a thesis submitted in partial fulfillment of the requrements for the degree of master of technology in telematics and signal processing by jyotisankar kalia, roll no209ec1104 under the guidance of prof. Therefore, the ability to excite the eigenfrequencies of a unit cell will enable its use as an e. To miniaturize the antennae further a metamaterial based approach has been incorporated. Nanostructured metamaterials exchange between experts in electromagnetics and material science editor in chief anne f. Next, the designed unitcell is cascaded to form a leakywave antenna. How to design metamaterial unit cell square srr design using cst and hfss duration. For the lower band, the design utilizes an outer square metallic strip. To realize a periodic array for a metamaterial absorber, the footprint. This means the capability to determine whether the em wave is. This is to certify that the thesis entitled, design of metamaterial based antenna using unit cells submitted by jyotisankar.
Feature size denotes lattice or unit cell size as appropriate. Phase characteristics of subwavelength antenna elements for efficient design of terahertz frequency and millimeter wave metasurfaces richard j. For both formats the functionality available will depend on how. Synthesis and analysis of metamaterial structure for microwave frequency applications vii list of figures 2.
Ive already investigated the farfield behavior by simulating a unitcell, utilizing masterslave boundaries to force the unitcell behavior to be replicated and forcing a plane wave to impinge upon the infinite sheet of metamaterial by utilizing perfect e and perfect h boundaries on my ports. Tutorial on modeling of metamaterial structure in ansys hfss. Dng metamaterial designs have been developed for operation at 400 mhz in the uhf frequency band. Unit cell simulation using master and slave boundary. This tutorial covers how to use master slave boundary conditions of hfss to simulate fss in terahertz region. The dispersion graphs are being assigned by resonant frequencies and proposed for the cells that are suitable for wireless applications. An array of unit cells may be used to get this structure. The most common method is to effectively create an infinite periodic array. The design of a compact metamaterial ultrawideband uwb antenna with a goal towards application in microwave imaging systems for detecting unwanted cells in human tissue, such as in cases of breast cancer, heart failure and brain stroke detection is proposed. Microwave imaging sensor using compact metamaterial uwb. There are wellknown methods of metamaterial design to provide simultaneous negative permittivity and permeability using srrs 5,6. What should be the dimensions of a metamaterial unit cell. Lumped elementbased, highly subwavelength, negative index metamaterials at uhf frequencies. We create a parameter space whose vector valued points represent potential unit cells and use these algorithms to optimize unit cell geometries based on a predefined metric, such as their bulk material response.
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