Dng metamaterial designs have been developed for operation at 400 mhz in the uhf frequency band. Next, the designed unitcell is cascaded to form a leakywave antenna. Tutorial on saptarshi ghosh, iit kanpur, india modeling of metamaterial absorber structure in ansys hfss saptarshi ghosh thesis supervisor. Design, fabrication, and testing of double negative metamaterials. First we must configure hfss to use its eigenmode solver. 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. Gain improvement of microstrip patch antenna using negative. How to design metamaterial unit cell square srr design using cst and hfss full tutorial. The equivalent circuit model of the crlh unit cell of the metamaterial transmission line. In this method, we first measure or simulate the reflection and transmission of a slab of metamaterial.
This tutorial covers how to use master slave boundary conditions of hfss to simulate fss in terahertz region. To give an example of metamaterial antennas, a team at china jiliang university. Hfss tutorial 1 microstrip patch antenna with coaxial feeding duration. Pull the mesh from the unit cell set hfss so it doesnt perform any additional meshing. It will consist of background presentations and discussion, applications and analysis examples with hfss and presentations from academia and industry. It is a soft option to design and fabricate it by recurring structure of unit cells. Thus, at this frequency, the unit cell size is d cell, both to be discussed in sec. What should be the dimensions of a metamaterial unit cell.
By using metamaterial reflecting surface technique we obtain 4. We note that the smaller the unit cell size is, the better the effective medium results should be, i. Proper description of assigning the boundaries and feeding mechanism was also mentioned. 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. Scripts have been generated for ansys hfss and also awr microwave officemwo. Microstrip patch antenna, srr, metamaterials, hfss i. Metamaterialinspired frequencyselective surfaces eecs.
Aug 18, 2016 this tutorial covers how to use master slave boundary conditions of hfss to simulate fss in terahertz region. In this paper, we propose a subwavelength metamaterial unit cell for lowfrequency electromagnetic absorber applications. 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. Cst microwave studio 1 one of the most important reports in metamaterial topics is dispersion curve, which determines the. How to design metamaterial unit cell square srr design. Metamaterial unit cell square srr design using cst and. Apart from the geometry of the unit cell element, material properties, conductor and substrate thickness the most influential. Doc how to for fsss in hfss draft form w references essential to understanding wgsas w hansen, microwave scanning antennas vol 2 if they are separate. Unit cell simulation using master and slave boundary. A threedimensional actuated origamiinspired transformable. Gain improvement of microstrip patch antenna using. The hfss scripts can either be directly run from within the hfss gui environment taking inputs from a preprepared. S k behera department of electronics and communication engineering. The proposed metamaterial antenna design starts with a metamaterial unit cell for uwb microwave imaging application.
Synthesis and analysis of metamaterial structure for microwave frequency applications iii resonator dssrr and microwave absorber. Tutorial on modeling of metamaterial structure in ansys hfss free download as pdf file. Next, the unit cell of the sievenpiper mushroom structure has to be drawn in hfss. 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. Hfss simulation of the proposed antenna shows improved gain and return loss. The simulated ge 2 sb 2 te 5 layer can be achieved as following. I would like to simulate metamaterial unit cell, i have problem about floquet port and masterslave boundary assignment in hfss. A compact metamaterial inspired antenna operate at lte, bluetooth and wimax frequency band is introduced in this paper.
Subwavelength metamaterial unit cell for lowfrequency. How can i simulate metamaterials based antenna in hfss. Lumped elementbased, highly subwavelength, negative index metamaterials at uhf frequencies. The unit cell can be an ecient source of radiation when excited by its eigencurrents 27. A rule of thumb is that the unit cell should be at most a tenth of the wavelength.
The unit cell is designed with its resonance within the uwb range of 3. A miniaturized antenna with negative index metamaterial based. The metal layer in the proposed unit cell follows drude model with the plasma frequency. Strucure of unit cell metamaterial are usually implemented in a periodic structure. The design of the mtm antenna thus begins with the use of one unit cell as the radiating element, as shown in figure 5a. Metamaterial fss unit cell design using hfss part 1 youtube. Metamaterial unit cell models the transmission line structures consist of series.
The resonance frequency for the intended antenna design is 2. It also covers how to change the angle of incidence with the help of floquet ports. Design of millimeter wave microstrip patch antenna for. Efforts to compensate and eliminate optical loss by introducing optical gain into the metamaterial matrix. Speeding up the hfss 3d simulation design cyle using customisable scripting. Assign the front and back faces of the box as waveport excitations with vertic. Improvement of characteristics of microstrip antenna using of. Each cell has a spacing of 1 mm in x andydirection to the adjacent ones as shown in figure 1. This includes remotely controlling how an incident electromagnetic wave em wave interacts with a metamaterial.
Retrieval center for metamaterials and integrated plasmonics. Feb 22, 2018 how to design metamaterial unit cell square srr design using cst and hfss duration. It consists of a square patch, a via, and a square block of substrate as shown in fig. Nanostructured metamaterials exchange between experts in electromagnetics and material science editor in chief anne f. The dielectric substrate is fr4 structure can be controlled by tuning the spiral and substrate dimensions. Microwave electronics lab analysis and design of lefthanded metamaterial lenses using ansoft hfss anthony lai1, kevin m. The key element behind our metamaterial mechanisms is a specialized type of cell, the only ability of which is to shear. In this paper, an investigation of metamaterial unit cells is presented based on their dispersion characteristics.
Phase characteristics of subwavelength antenna elements for efficient design of terahertz frequency and millimeter wave metasurfaces richard j. 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. 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. Phase characteristics of subwavelength antenna elements for. A unit cell is a combination of srr and wire structure which is shown in figure. The analysis of the required onedimensional lefthanded metamaterial unitcell based on microstrip technology is presented in detail. Hfss simulation of the proposed antenna shows improved gain and return loss at the centre frequency of 4. The retrieval method is a practical approach to determine the effective properties of metamaterials. Therefore, the ability to excite the eigenfrequencies of a unit cell will enable its use as an e. Design of millimeter wave microstrip patch antenna for mimo. To miniaturize the antennae further a metamaterial based approach has been incorporated. Hfss with hpc for large finite antenna array design 8232011.
Using amperes circuital law, we can relate flux on disk faces and the resonant behaviour of edr unit cell. 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. In order to form the metamaterial unit cells a metal. To realize a periodic array for a metamaterial absorber, the footprint. A comparative analysis of different conventional and metamaterial based microstrip patch antenna. This proposed uwb antenna is made of four metamaterial unit cells, where each cell is an integration of a modified split ring. Design of metamaterials in hfss and extraction of permittivity and permeability using nrw method. The dispersion graphs are being assigned by resonant frequencies and proposed for the cells that are suitable for wireless applications. For both formats the functionality available will depend on how. To study the electromagnetic resonant property of the proposed structure, simulations are performed by ansofts hfss. Synthesis and analysis of metamaterial structure for microwave frequency applications vii list of figures 2. 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. The transient solver could also be used to model unit cells at normal incidence.
A unit cell of srr has also been designed for the frequency of 10. A copper srr and wire are positioned on opposite sides of the substrate,modeling the structures typically produced by lithographic circuit board techniques. The structures of unit cells were simulated using high frequency structure simulator hfss software. Ive already investigated the farfield behavior by simulating a unit cell, utilizing masterslave boundaries to force the unit cell 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. Create a box around your single metamaterial element, such as an split ring resonator srr. 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. Mechanical metamaterials exhibit unusual properties through the shape and movement of their engineered subunits. Dual band metamaterial antenna for ltebluetoothwimax. The unit cell is cubic, with a cell dimension of d2. Feature size denotes lattice or unit cell size as appropriate. Tutorial on modeling of metamaterial structure in ansys hfss. Enhancement of the absorption and bandwidth of a hybrid.
Improvement of characteristics of microstrip antenna using. The results are measured over the frequency range of 8 ghz to 20ghz by em solver ansoft hfss. The use of lumped elements enabled the creation of highly subwavelength unit cells whose. An array of unit cells may be used to get this structure. The analysis of the required onedimensional lefthanded metamaterial unit cell based on microstrip technology is presented in detail. The unit cell for the coupled s shaped structure medium is shown in fig. There are wellknown methods of metamaterial design to provide simultaneous negative permittivity and permeability using srrs 5,6. Pdf a proposed design of unit cell of metamaterial for 5g mobile. Lumped elementbased, highly subwavelength, negative index. Next, the unitcell of the sievenpiper mushroom structure has to be drawn in hfss. Ansys hfss with hpc for large finite antenna array design. A miniaturized antenna with negative index metamaterial. Microwave electronics lab hfss characterization of 2d crlh tl 0 2 4 6 8 10 12.
To obtain refraction index of metamaterial superstrate, a unit cell is identified from the full size structure and placed in. They have taken airdielectricair as an example, which is a 3d structure. Tutorial on modeling of metamaterial structure in ansys hfss scribd. Kumar vaibhav srivastava department of electrical engineering indian institute of technology, kanpur, india. The most common method is to effectively create an infinite periodic array. 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. Single pixel characterization spectrally selective and polarization sensitive. Metamaterial unit cell square srr design using cst and hfss part 1. A tunable metamaterial is a metamaterial with a variable response to an incident electromagnetic wave.
Hey everybody, im simulating a dng metamaterial in hfss 12. How to design metamaterial unit cell square srr design using cst and hfss duration. This is to certify that the thesis entitled, design of metamaterial based antenna using unit cells submitted by jyotisankar. Mar 11, 2016 a threedimensional actuated origamiinspired transformable metamaterial with multiple degrees of freedom. For the lower band, the design utilizes an outer square metallic strip. Metamaterial seminar sponsored by ansys the ansys metamaterials simulation conference will focus on electromagnetic simulation of metamaterial and metamaterial related structures. A study of srr based microstrip antenna and their equivalent circuits have been carried out. For each unit cell type, the dimensions of unit cell can be adjusted to satisfy condition at resonant frequency fr. Phase characteristics of subwavelength antenna elements. Tunability of triangular srr and wire strip tsrrws. Theoretical and experimental studies have shown that such structures can be taken as a homogenous medium with a low plasma frequency 4. Please help me in the modeling of srr structure in hfss. 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.
This work presents a new investigation of the poissons ratios of a family of. Metamaterials in application to improve antenna parameters. This means the capability to determine whether the em wave is transmitted, reflected, or absorbed. Nixonb asubmillimeterwave technology laboratory, university of massachusetts lowell, lowell, ma, usa 01854. 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. Speeding up the hfss 3d simulation design cyle using. Microwave imaging sensor using compact metamaterial uwb. How to simulate metamaterial antenna using hfss quora. Next, the designed unit cell is cascaded to form a leakywave antenna. 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. This video coantains design procedures of a square shaped metamaterial unit cell using cst and hfss. It was observed that electric field reverses direction just above or just below the resonant frequency of unit cell, thus depicting negative. Lumped elementbased, highly subwavelength, negative.
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